# HowToolbox (how.box)

> Calculators, converters and checks: 208 active utilities, 239 module tools, 8 languages.

## Start here

- [Agent guide](https://how.box/agents.md): endpoints, JSON-RPC examples, limits and errors
- [MCP endpoint](https://how.box/mcp): stateless Streamable HTTP
- [Tool definitions](https://how.box/fr/agent-tools.json): descriptions and input schemas
- [Catalog](https://how.box/fr/catalog.json): utilities and answer-link parameters
- [Full text](https://how.box/fr/llms-full.txt): explanations and FAQ
- [Agent terms and limits](https://how.box/fr/about/agents/)

## Tools

- [Calculateur de significativité de test A/B](https://how.box/fr/finance/ab-test/): Le résultat de votre test A/B est-il réel ou dû au hasard ? Taux de conversion, gain, valeur p et intervalle de confiance d’un test A/B, avec la taille d’échantillon nécessaire.
  - Addresses: en https://how.box/finance/ab-test/, en-us https://how.box/en-us/finance/ab-test/, fi https://how.box/fi/finance/ab-test/, de https://how.box/de/finance/ab-test/, es https://how.box/es/finance/ab-test/, fr https://how.box/fr/finance/ab-test/, sv https://how.box/sv/finance/ab-test/, it https://how.box/it/finance/ab-test/, et https://how.box/et/finance/ab-test/
  - Link to an answer: https://how.box/fr/finance/ab-test/?na={na}&ca={ca}&nb={nb}&cb={cb}&c={c}&h={h}&pw={pw} (na: whole number 1 to 1e9; ca: whole number 0 to 1e9; nb: whole number 1 to 1e9; cb: whole number 0 to 1e9; c: number 80 to 99.9; h: two-sided, greater or less; pw: number 50 to 99), e.g. https://how.box/fr/finance/ab-test/?na=10000&ca=400&nb=10000&cb=500&c=95&h=two-sided&pw=80. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, statistics.
  - Agent tools: `ab_test_calculate` (A/B test of two conversion rates with the pooled two-proportion z-test (equal to Pearson's χ² without continuity correction).)
- [Âge exact](https://how.box/fr/datetime/age/): Quel âge avez-vous exactement ? Votre âge en années, mois et jours, les totaux et votre prochain anniversaire.
  - Addresses: en https://how.box/datetime/age/, en-us https://how.box/en-us/datetime/age/, fi https://how.box/fi/datetime/age/, de https://how.box/de/datetime/age/, es https://how.box/es/datetime/age/, fr https://how.box/fr/datetime/age/, sv https://how.box/sv/datetime/age/, it https://how.box/it/datetime/age/, et https://how.box/et/datetime/age/
  - Link to an answer: https://how.box/fr/datetime/age/?b={b}&d={d} (b: text; d: text), e.g. https://how.box/fr/datetime/age/?b=1990-05-17&d=2030-01-01. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `age_calculate` (Exact age from a date of birth on a date (default: today on the visitor's device): whole years, months and days; the totals in months, weeks (+ days) and days; and the next birthday (ISO date, ISO weekday 1 Monday–7 Sunday, days to go, the age turned).)
- [Codes des compagnies aériennes](https://how.box/fr/aviation/airline-codes/): Quelle compagnie correspond à ce code ? Retrouvez une compagnie par code IATA ou OACI, indicatif radio ou nom : ses codes, son indicatif, son pays et son activité.
  - Addresses: en https://how.box/aviation/airline-codes/, en-us https://how.box/en-us/aviation/airline-codes/, fi https://how.box/fi/aviation/airline-codes/, de https://how.box/de/aviation/airline-codes/, es https://how.box/es/aviation/airline-codes/, fr https://how.box/fr/aviation/airline-codes/, sv https://how.box/sv/aviation/airline-codes/, it https://how.box/it/aviation/airline-codes/, et https://how.box/et/aviation/airline-codes/
  - Link to an answer: https://how.box/fr/aviation/airline-codes/?q={q}&s={s}&c={c} (q: text; s: (empty), current or defunct; c: text), e.g. https://how.box/fr/aviation/airline-codes/?q=Speedbird&s=current&c=BAW. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, flight.
  - Agent tools: `airline_codes_lookup` (Searches airlines by IATA designator (BA), ICAO designator (BAW), radio call sign (Speedbird), name or country (case and accents ignored); exact codes and call signs first, current airlines before defunct ones.); `airline_codes_get` (Gets the airlines with one IATA (BA) or ICAO (BAW) designator, current first: a code can have been held by a defunct airline before.)
- [Codes des aéroports](https://how.box/fr/aviation/airport-codes/): Quel aéroport correspond à ce code ? Retrouvez un aéroport par code IATA ou OACI, nom ou ville : codes, localisation, altitude et vols réguliers.
  - Addresses: en https://how.box/aviation/airport-codes/, en-us https://how.box/en-us/aviation/airport-codes/, fi https://how.box/fi/aviation/airport-codes/, de https://how.box/de/aviation/airport-codes/, es https://how.box/es/aviation/airport-codes/, fr https://how.box/fr/aviation/airport-codes/, sv https://how.box/sv/aviation/airport-codes/, it https://how.box/it/aviation/airport-codes/, et https://how.box/et/aviation/airport-codes/
  - Link to an answer: https://how.box/fr/aviation/airport-codes/?q={q}&t={t}&c={c} (q: text; t: (empty), large_airport, medium_airport, small_airport, seaplane_base or heliport; c: text), e.g. https://how.box/fr/aviation/airport-codes/?q=HEL&t=large_airport&c=EFHK. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, flight.
  - Agent tools: `airport_codes_lookup` (Searches airports and airfields by IATA code, ICAO code, name or city (case and accents ignored); exact codes first, then larger airports with scheduled service.); `airport_codes_get` (Gets one airport by its IATA code (HEL) or ICAO code (EFHK).)
- [Convertisseur de vitesses air](https://how.box/fr/aviation/airspeed/): Comment relier IAS, CAS, TAS et Mach ? Vitesses indiquée, vraie et équivalente, et nombre de Mach selon l’altitude et la température, avec comparaison à la règle des 2 %.
  - Addresses: en https://how.box/aviation/airspeed/, en-us https://how.box/en-us/aviation/airspeed/, fi https://how.box/fi/aviation/airspeed/, de https://how.box/de/aviation/airspeed/, es https://how.box/es/aviation/airspeed/, fr https://how.box/fr/aviation/airspeed/, sv https://how.box/sv/aviation/airspeed/, it https://how.box/it/aviation/airspeed/, et https://how.box/et/aviation/airspeed/
  - Link to an answer: https://how.box/fr/aviation/airspeed/?s={s}&k={k}&su={su}&a={a}&au={au}&t={t}&tu={tu} (s: number; k: ias, tas or mach; su: kt, kmh or mph; a: number; au: ft or m; t: text; tu: c or f), e.g. https://how.box/fr/aviation/airspeed/?s=120&k=ias&su=kt&a=8000&au=ft&t=-5&tu=c. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, flight, speed, converter.
  - Agent tools: `airspeed_calculate` (Converts between indicated (IAS, taken as calibrated, CAS), equivalent (EAS) and true airspeed (TAS) and Mach number at a pressure altitude, on the ICAO standard atmosphere (Doc 7488) with the subsonic compressible pitot formula.)
- [Calage altimétrique](https://how.box/fr/aviation/altimeter/): Comment relier QNH, QFE et niveaux de vol ? Altitude QNH, niveau de vol et QFE comparés, conversions hPa ↔ inHg ↔ mmHg, niveaux de transition et de croisière, correction de froid.
  - Addresses: en https://how.box/aviation/altimeter/, en-us https://how.box/en-us/aviation/altimeter/, fi https://how.box/fi/aviation/altimeter/, de https://how.box/de/aviation/altimeter/, es https://how.box/es/aviation/altimeter/, fr https://how.box/fr/aviation/altimeter/, sv https://how.box/sv/aviation/altimeter/, it https://how.box/it/aviation/altimeter/, et https://how.box/et/aviation/altimeter/
  - Link to an answer: https://how.box/fr/aviation/altimeter/?q={q}&qu={qu}&r={r}&a={a}&fl={fl}&e={e}&ta={ta}&tl={tl}&tr={tr}&fr={fr}&t={t} (q: number; qu: hpa, inhg or mmhg; r: qnh or standard; a: number -2000 to 60000; fl: number 0 to 600; e: number -1500 to 15000; ta: number 1000 to 20000; tl: number 0 to 5000; tr: text; fr: ifr or vfr; t: text), e.g. https://how.box/fr/aviation/altimeter/?q=1003&qu=hpa&r=qnh&a=3000&fl=70&e=500&ta=5000&tl=0&tr=90&fr=ifr&t=-10. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, flight, converter, temperature.
  - Agent tools: `altimeter_calculate` (Altimeter settings on the ICAO standard atmosphere: from QNH (hPa, inHg or mmHg) and either an altitude in feet on QNH (reference "qnh") or a flight level (reference "standard"), returns the altitude on QNH, the pressure altitude and flight level, the FAA rule-of-thumb pressure altitude, QNH and QFE in hPa/inHg/mmHg with the height read on QFE above an aerodrome elevation, and the transition level for a transition altitude (and minimum layer).)
- [Convertisseur d’angles](https://how.box/fr/conversion/angle/): Combien de radians fait cet angle ? Convertissez entre degrés, radians, grades, minutes et secondes d’arc, tours et millièmes.
  - Addresses: en https://how.box/conversion/angle/, en-us https://how.box/en-us/conversion/angle/, fi https://how.box/fi/conversion/angle/, de https://how.box/de/conversion/angle/, es https://how.box/es/conversion/angle/, fr https://how.box/fr/conversion/angle/, sv https://how.box/sv/conversion/angle/, it https://how.box/it/conversion/angle/, et https://how.box/et/conversion/angle/
  - Link to an answer: https://how.box/fr/conversion/angle/?v={v}&from={from}&to={to} (v: number -1e15 to 1e15; from: deg, rad, mrad, grad, arcmin, arcsec, turn or mil; to: deg, rad, mrad, grad, arcmin, arcsec, turn or mil), e.g. https://how.box/fr/conversion/angle/?v=1&from=rad&to=deg. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, geometry.
  - Agent tools: `angle_convert` (Converts a angle between units using exact definitions (1 deg = π/180 rad, 1 grad (gon) = π/200 rad, 1 arcmin = 1/60 deg, 1 arcsec = 1/60 arcmin, 1 turn = 2π rad, 1 mil (NATO) = 2π/6400 rad, 1 mrad = 0.001 rad; BIPM SI Brochure Table 8, NIST SP 811 B.9).)
  - Preset [Degrés en radians](https://how.box/fr/conversion/degrees-to-radians/): Comment convertir des degrés en radians ? The same tool, preconfigured.
- [Calculateur de TAEG](https://how.box/fr/finance/apr/): Combien votre crédit vous coûte-t-il vraiment par an ? Transformez le taux d’intérêt et les frais d’un crédit en un seul taux annuel effectif global (TAEG), selon la formule européenne.
  - Addresses: en https://how.box/finance/apr/, en-us https://how.box/en-us/finance/apr/, fi https://how.box/fi/finance/apr/, de https://how.box/de/finance/apr/, es https://how.box/es/finance/apr/, fr https://how.box/fr/finance/apr/, sv https://how.box/sv/finance/apr/, it https://how.box/it/finance/apr/, et https://how.box/et/finance/apr/
  - Link to an answer: https://how.box/fr/finance/apr/?a={a}&r={r}&n={n}&sf={sf}&mf={mf}&c={c} (a: number 0 to 1e7; r: number 0 to 100; n: whole number 1 to 600; sf: number 0 to 1e7; mf: number 0 to 1e7; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL), e.g. https://how.box/fr/finance/apr/?a=5000&r=9&n=36&sf=100&mf=5&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, loans, interest, costs.
  - Agent tools: `apr_calculate` (Annual percentage rate of charge (APR) of an instalment credit by the EU consumer credit formula (Directive 2023/2225 Annex III): the rate X where the amount paid out equals the instalments and fees discounted at (1 + X)^−t, t in years of 12 equal months.)
- [Convertisseur de surfaces](https://how.box/fr/conversion/area/): Quelle surface cela représente-t-il dans d’autres unités ? Convertissez exactement mètres carrés, hectares, acres, pieds carrés, miles carrés et autres unités.
  - Addresses: en https://how.box/conversion/area/, en-us https://how.box/en-us/conversion/area/, fi https://how.box/fi/conversion/area/, de https://how.box/de/conversion/area/, es https://how.box/es/conversion/area/, fr https://how.box/fr/conversion/area/, sv https://how.box/sv/conversion/area/, it https://how.box/it/conversion/area/, et https://how.box/et/conversion/area/
  - Link to an answer: https://how.box/fr/conversion/area/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: mm2, cm2, m2, a, ha, km2, in2, ft2, yd2, acre or mi2; to: mm2, cm2, m2, a, ha, km2, in2, ft2, yd2, acre or mi2), e.g. https://how.box/fr/conversion/area/?v=1&from=m2&to=ft2. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, area, metric, imperial.
  - Agent tools: `area_convert` (Converts an area between units using exact definitions (1 ha = 10 000 m², 1 are = 100 m², international foot 0.3048 m so 1 ft² = 0.09290304 m², 1 yd² = 9 ft², 1 acre = 43 560 ft² = 4046.8564224 m², 1 mi² = 640 acres; BIPM SI Brochure, NIST SP 811 B.8).)
  - Preset [Acres en hectares](https://how.box/fr/conversion/acres-to-hectares/): Combien d’hectares vaut un acre ? The same tool, preconfigured.
- [Calculateur de proportions](https://how.box/fr/media/aspect-ratio/): Quelles sont les proportions de votre écran ou image ? Calculez le rapport largeur/hauteur ou les dimensions d’une image ou vidéo redimensionnée sans déformation.
  - Addresses: en https://how.box/media/aspect-ratio/, en-us https://how.box/en-us/media/aspect-ratio/, fi https://how.box/fi/media/aspect-ratio/, de https://how.box/de/media/aspect-ratio/, es https://how.box/es/media/aspect-ratio/, fr https://how.box/fr/media/aspect-ratio/, sv https://how.box/sv/media/aspect-ratio/, it https://how.box/it/media/aspect-ratio/, et https://how.box/et/media/aspect-ratio/
  - Link to an answer: https://how.box/fr/media/aspect-ratio/?m={m}&w={w}&h={h}&k={k}&s={s} (m: ratio or resize; w: number 0 to 1e9; h: number 0 to 1e9; k: width or height; s: number 0 to 1e9), e.g. https://how.box/fr/media/aspect-ratio/?m=ratio&w=1920&h=1080&k=width&s=1280. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `aspect_ratio_calculate` (Aspect ratio of a width × height and resizing at the same ratio.)
- [Calculateur de moyenne](https://how.box/fr/math/average/): Comment calculer la moyenne de ces nombres ? Moyenne, médiane, mode et étendue, avec effectif, somme, minimum et maximum.
  - Addresses: en https://how.box/math/average/, en-us https://how.box/en-us/math/average/, fi https://how.box/fi/math/average/, de https://how.box/de/math/average/, es https://how.box/es/math/average/, fr https://how.box/fr/math/average/, sv https://how.box/sv/math/average/, it https://how.box/it/math/average/, et https://how.box/et/math/average/
  - Link to an answer: https://how.box/fr/math/average/?v={v} (v: text), e.g. https://how.box/fr/math/average/?v=3+5+5+7+10. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, statistics.
  - Agent tools: `average_calculate` (Statistics of a list of numbers: count, sum, mean (sum ÷ count), median (middle value, or the mean of the two middle values for an even count), modes (every value that occurs most often, empty when none occurs twice), min, max and range (max − min).)
- [Générateur de codes-barres](https://how.box/fr/media/barcode/): Comment créer un code-barres ? EAN-13, EAN-8, UPC-A, Code 128 et codes-barres bancaires finlandais à télécharger.
  - Addresses: en https://how.box/media/barcode/, en-us https://how.box/en-us/media/barcode/, fi https://how.box/fi/media/barcode/, de https://how.box/de/media/barcode/, es https://how.box/es/media/barcode/, fr https://how.box/fr/media/barcode/, sv https://how.box/sv/media/barcode/, it https://how.box/it/media/barcode/, et https://how.box/et/media/barcode/
  - Link to an answer: https://how.box/fr/media/barcode/?f={f}&v={v}&iban={iban}&r={r}&sum={sum}&due={due}&vc={vc}&t={t}&x={x} (f: ean13, ean8, upca, code128 or fi-bank; v: text; iban: text; r: text; sum: number 0 to 999999.99; due: text; vc: text; t: boolean; x: number 0.25 to 1), e.g. https://how.box/fr/media/barcode/?f=ean13&v=400638133393&iban=FI7944052020036082&r=868516259619897&sum=4883.15&due=2026-06-12&vc=479440520200360820048831500000000868516259619897100612&t=1&x=0.33. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, encoding.
  - Agent tools: `barcode_make` (Make a linear barcode and show it on the page, ready to download.)
  - Preset [Générateur de code-barres bancaire](https://how.box/fr/media/bank-barcode/): Comment créer le code-barres bancaire d’une facture finlandaise ? The same tool, preconfigured.
- [Encoder et décoder en Base64](https://how.box/fr/text/base64/): Comment convertir du texte ou un fichier en Base64 ? Encodez du texte ou un fichier en Base64, puis décodez-le directement dans votre navigateur.
  - Addresses: en https://how.box/text/base64/, en-us https://how.box/en-us/text/base64/, fi https://how.box/fi/text/base64/, de https://how.box/de/text/base64/, es https://how.box/es/text/base64/, fr https://how.box/fr/text/base64/, sv https://how.box/sv/text/base64/, it https://how.box/it/text/base64/, et https://how.box/et/text/base64/
  - Link to an answer: https://how.box/fr/text/base64/?dir={dir}&text={text}&url={url}&pad={pad} (dir: encode or decode; text: text; url: boolean; pad: boolean), e.g. https://how.box/fr/text/base64/?dir=encode&text=Hello%2C+world%21&url=0&pad=1. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, encoding.
  - Agent tools: `base64_convert` (Converts text to Base64 or Base64 to text, as in RFC 4648 (standard alphabet, or the URL-safe one of §5), reading and writing text as UTF-8.)
- [Tailles de piles](https://how.box/fr/electronics/battery-sizes/): Quelle taille fait une pile AA, et comment l’appelle-t-on ailleurs ? Toutes les tailles de piles courantes, de AAA à D, 9 V, piles bouton CR2032 et LR44 jusqu’à 18650 : dimensions, tension, noms CEI et équivalences.
  - Addresses: en https://how.box/electronics/battery-sizes/, en-us https://how.box/en-us/electronics/battery-sizes/, fi https://how.box/fi/electronics/battery-sizes/, de https://how.box/de/electronics/battery-sizes/, es https://how.box/es/electronics/battery-sizes/, fr https://how.box/fr/electronics/battery-sizes/, sv https://how.box/sv/electronics/battery-sizes/, it https://how.box/it/electronics/battery-sizes/, et https://how.box/et/electronics/battery-sizes/
  - Link to an answer: https://how.box/fr/electronics/battery-sizes/?q={q}&g={g}&b={b} (q: text; g: (empty), household, coin, button, hearing, photo or li-ion; b: text), e.g. https://how.box/fr/electronics/battery-sizes/?q=cr2032&g=coin&b=aa. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, length.
  - Agent tools: `battery_sizes_lookup` (Searches battery sizes by name, IEC or ANSI designation, maker number or use (smoke alarm, car key, hearing aid); best matches first.); `battery_sizes_get` (Gets one battery size by any of its names or designations (AA = LR6 = MN1500 = 15A; LR44 = AG13 = 357).)
- [Convertisseur de glycémie](https://how.box/fr/health/blood-sugar/): Comment convertir des mmol/L en mg/dL ? Convertissez la glycémie entre mmol/L et mg/dL, et l’HbA1c entre mmol/mol et %, avec la glycémie moyenne estimée.
  - Addresses: en https://how.box/health/blood-sugar/, en-us https://how.box/en-us/health/blood-sugar/, fi https://how.box/fi/health/blood-sugar/, de https://how.box/de/health/blood-sugar/, es https://how.box/es/health/blood-sugar/, fr https://how.box/fr/health/blood-sugar/, sv https://how.box/sv/health/blood-sugar/, it https://how.box/it/health/blood-sugar/, et https://how.box/et/health/blood-sugar/
  - Link to an answer: https://how.box/fr/health/blood-sugar/?m={m}&g={g}&gu={gu}&a={a}&au={au} (m: glucose or hba1c; g: number 0.5 to 1100; gu: mmol_l or mg_dl; a: number 3 to 195; au: mmol_mol or percent), e.g. https://how.box/fr/health/blood-sugar/?m=hba1c&g=100&gu=mg_dl&a=6.5&au=percent. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, calculator.
  - Agent tools: `blood_sugar_convert` (Converts blood sugar values.)
- [Calculateur d’IMC](https://how.box/fr/health/bmi/): Quel est votre indice de masse corporelle (IMC) ? Votre IMC, sa catégorie adulte OMS, la plage de poids normal pour votre taille et les limites de cet indice.
  - Addresses: en https://how.box/health/bmi/, en-us https://how.box/en-us/health/bmi/, fi https://how.box/fi/health/bmi/, de https://how.box/de/health/bmi/, es https://how.box/es/health/bmi/, fr https://how.box/fr/health/bmi/, sv https://how.box/sv/health/bmi/, it https://how.box/it/health/bmi/, et https://how.box/et/health/bmi/
  - Link to an answer: https://how.box/fr/health/bmi/?u={u}&h={h}&w={w}&ft={ft}&in={in}&lb={lb} (u: metric or us; h: number 50 to 250; w: number 10 to 400; ft: whole number 1 to 8; in: number 0 to 11.9; lb: number 22 to 880), e.g. https://how.box/fr/health/bmi/?u=metric&h=175&w=70&ft=5&in=9&lb=155. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, weight, fitness.
  - Agent tools: `bmi_calculate` (Body mass index (BMI) of an adult (18 or older, not pregnant): weight (kg) / height (m)².)
- [Calculateur de masse grasse](https://how.box/fr/health/body-fat/): Quelle part de votre corps est de la graisse ? Une estimation de votre taux de masse grasse avec un mètre ruban : taille, cou et tour de taille, plus les hanches pour les femmes, selon la méthode de l’US Navy.
  - Addresses: en https://how.box/health/body-fat/, en-us https://how.box/en-us/health/body-fat/, fi https://how.box/fi/health/body-fat/, de https://how.box/de/health/body-fat/, es https://how.box/es/health/body-fat/, fr https://how.box/fr/health/body-fat/, sv https://how.box/sv/health/body-fat/, it https://how.box/it/health/body-fat/, et https://how.box/et/health/body-fat/
  - Link to an answer: https://how.box/fr/health/body-fat/?s={s}&u={u}&h={h}&w={w}&ft={ft}&in={in}&lb={lb}&n={n}&wa={wa}&hi={hi}&ni={ni}&wi={wi}&hii={hii} (s: female or male; u: metric or us; h: number 120 to 230; w: number 30 to 300; ft: whole number 4 to 7; in: number 0 to 11.9; lb: number 66 to 660; n: number 20 to 70; wa: number 40 to 200; hi: number 50 to 200; ni: number 8 to 28; wi: number 16 to 80; hii: number 20 to 80), e.g. https://how.box/fr/health/body-fat/?s=male&u=metric&h=180&w=80&ft=5&in=10&lb=176&n=38&wa=85&hi=95&ni=15&wi=34&hii=38. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, fitness, weight.
  - Agent tools: `body_fat_calculate` (Estimated body fat percentage of an adult by the US Navy circumference method (Hodgdon & Beckett 1984, used by the US Department of Defense).)
- [Traducteur braille](https://how.box/fr/text/braille/): Comment écrire votre texte en braille ? Convertissez du texte en braille anglais unifié et inversement : lettres, majuscules, chiffres et ponctuation de base.
  - Addresses: en https://how.box/text/braille/, en-us https://how.box/en-us/text/braille/, fi https://how.box/fi/text/braille/, de https://how.box/de/text/braille/, es https://how.box/es/text/braille/, fr https://how.box/fr/text/braille/, sv https://how.box/sv/text/braille/, it https://how.box/it/text/braille/, et https://how.box/et/text/braille/
  - Link to an answer: https://how.box/fr/text/braille/?d={d}&m={m} (d: encode or decode; m: text), e.g. https://how.box/fr/text/braille/?d=decode&m=Hello. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, encoding.
  - Agent tools: `braille_encode` (Write text in Unified English Braille grade 1 (uncontracted, ICEB Rules of UEB 2013): letters, digits with the numeric indicator and the letter sign where needed, capital sign, capitals word and passage indicators, and basic punctuation.); `braille_decode` (Read Unicode braille cells as text, following uncontracted Unified English Braille (grade 1).)
- [Calculateur de seuil de rentabilité](https://how.box/fr/finance/break-even/): Combien devez-vous vendre pour atteindre le seuil de rentabilité ? Obtenez les unités et le chiffre d’affaires qui couvrent vos coûts fixes et variables.
  - Addresses: en https://how.box/finance/break-even/, en-us https://how.box/en-us/finance/break-even/, fi https://how.box/fi/finance/break-even/, de https://how.box/de/finance/break-even/, es https://how.box/es/finance/break-even/, fr https://how.box/fr/finance/break-even/, sv https://how.box/sv/finance/break-even/, it https://how.box/it/finance/break-even/, et https://how.box/et/finance/break-even/
  - Link to an answer: https://how.box/fr/finance/break-even/?f={f}&p={p}&vc={vc} (f: number 0 to 1e9; p: number 0 to 1e9; vc: number 0 to 1e9), e.g. https://how.box/fr/finance/break-even/?f=10000&p=50&vc=20. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, costs.
  - Agent tools: `break_even_calculate` (Break-even point from fixed costs, the selling price per unit (without VAT, same currency) and the variable cost per unit (below the price).)
- [Vérificateur de numéro d’entreprise](https://how.box/fr/finance/business-id/): Ce numéro d’entreprise finlandais est-il valide ? Vérifiez la clé de contrôle d’un numéro d’entreprise finlandais et obtenez le numéro de TVA correspondant.
  - Addresses: en https://how.box/finance/business-id/, en-us https://how.box/en-us/finance/business-id/, fi https://how.box/fi/finance/business-id/, de https://how.box/de/finance/business-id/, es https://how.box/es/finance/business-id/, fr https://how.box/fr/finance/business-id/, sv https://how.box/sv/finance/business-id/, it https://how.box/it/finance/business-id/, et https://how.box/et/finance/business-id/
  - Link to an answer: https://how.box/fr/finance/business-id/?id={id} (id: text), e.g. https://how.box/fr/finance/business-id/?id=0112038-9. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker, tax. Countries: FI (Finlande).
  - Agent tools: `business_id_check` (Check a Finnish business ID (Y-tunnus, 1234567-8) with its mod-11 check digit, or give only the first seven digits to get the check digit.)
- [Calendrier à imprimer](https://how.box/fr/printables/calendar/): Comment imprimer un calendrier ? Une année ou un mois par page, avec numéros de semaine et jours fériés, prêt à imprimer.
  - Addresses: en https://how.box/printables/calendar/, en-us https://how.box/en-us/printables/calendar/, fi https://how.box/fi/printables/calendar/, de https://how.box/de/printables/calendar/, es https://how.box/es/printables/calendar/, fr https://how.box/fr/printables/calendar/, sv https://how.box/sv/printables/calendar/, it https://how.box/it/printables/calendar/, et https://how.box/et/printables/calendar/
  - Link to an answer: https://how.box/fr/printables/calendar/?y={y}&v={v}&m={m}&f={f}&w={w}&h={h}&p={p}&o={o} (y: whole number 1583 to 9999; v: year or month; m: whole number 1 to 12; f: monday, sunday or saturday; w: boolean; h: none or fi; p: a4 or letter; o: portrait or landscape), e.g. https://how.box/fr/printables/calendar/?y=2027&v=year&m=1&f=monday&w=1&h=fi&p=a4&o=portrait. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, reference.
  - Agent tools: `calendar_month` (One calendar month as rows of seven days starting on first_day (monday, sunday or saturday).)
- [Calculateur de calories quotidiennes](https://how.box/fr/health/calories/): Combien de calories vous faut-il par jour ? Métabolisme de base (BMR) et dépense quotidienne estimée, en kcal ou kJ, selon votre âge, votre corpulence et votre activité.
  - Addresses: en https://how.box/health/calories/, en-us https://how.box/en-us/health/calories/, fi https://how.box/fi/health/calories/, de https://how.box/de/health/calories/, es https://how.box/es/health/calories/, fr https://how.box/fr/health/calories/, sv https://how.box/sv/health/calories/, it https://how.box/it/health/calories/, et https://how.box/et/health/calories/
  - Link to an answer: https://how.box/fr/health/calories/?s={s}&a={a}&u={u}&h={h}&w={w}&ft={ft}&in={in}&lb={lb}&act={act}&e={e} (s: female or male; a: whole number 18 to 100; u: metric or us; h: number 100 to 250; w: number 25 to 400; ft: whole number 3 to 8; in: number 0 to 11.9; lb: number 55 to 880; act: light, moderate or vigorous; e: kcal or kj), e.g. https://how.box/fr/health/calories/?s=male&a=40&u=us&h=180&w=80&ft=6&in=0&lb=176&act=moderate&e=kj. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, fitness, energy.
  - Agent tools: `calories_calculate` (Resting energy (BMR, Mifflin–St Jeor equation) and estimated daily energy need of a healthy adult (18–100): BMR × activity factor.)
- [Calculateur de calories brûlées](https://how.box/fr/health/calories-burned/): Combien de calories brûlez-vous pendant votre séance ? L’énergie dépensée dans environ 200 activités, de la marche et la course à la natation, au ski et au ménage, selon leurs valeurs MET.
  - Addresses: en https://how.box/health/calories-burned/, en-us https://how.box/en-us/health/calories-burned/, fi https://how.box/fi/health/calories-burned/, de https://how.box/de/health/calories-burned/, es https://how.box/es/health/calories-burned/, fr https://how.box/fr/health/calories-burned/, sv https://how.box/sv/health/calories-burned/, it https://how.box/it/health/calories-burned/, et https://how.box/et/health/calories-burned/
  - Link to an answer: https://how.box/fr/health/calories-burned/?a={a}&t={t}&u={u}&w={w}&lb={lb} (a: 17151, 17152, 17170, 17190, 17200, 17220, 17230, 17165, 17270, 17100, 17304, 17305, 17082, 17012, 17010, 17035, 17110, 17131, 17134, 17070, 17358, 17361, 12020, 12025, 12010, 12028, 12030, 12045, 12050, 12060, 12070, 12080, 12090, 12100, 12110, 12120, 12130, 12132, 12140, 12200, 12170, 12350, 12145, 01015, 01016, 01017, 01011, 01020, 01030, 01040, 01050, 01060, 01009, 01003, 01084, 01088, 01200, 01214, 01220, 01228, 01236, 01270, 02000, 02005, 02006, 02020, 02022, 02024, 02032, 02040, 02048, 02049, 02050, 02054, 02058, 02061, 02064, 02065, 02068, 02071, 02072, 02073, 02101, 02105, 02150, 02160, 02185, 02210, 02214, 02310, 15670, 03010, 03031, 03040, 03042, 03090, 03070, 15030, 15055, 15070, 15092, 15100, 15110, 15180, 15205, 15250, 15252, 15255, 15265, 15330, 15350, 15360, 15370, 15430, 15457, 15480, 15533, 15534, 15550, 15580, 15591, 15605, 15610, 15620, 15650, 15675, 15685, 15700, 15725, 15195, 18240, 18230, 18265, 18255, 18270, 18310, 18300, 18350, 18355, 18368, 18366, 18070, 18100, 18224, 18220, 18210, 18200, 18120, 18150, 19080, 19090, 19100, 19135, 19150, 19160, 19170, 19020, 19040, 19190, 19180, 19252, 19254, 05030, 05043, 05021, 05010, 05022, 05041, 05049, 05050, 05070, 05090, 05060, 05054, 05120, 05150, 05175, 05184, 06160, 06150, 06040, 06225, 08095, 08100, 08160, 08245, 08050, 08240, 08140, 08230, 08019, 08010, 08255, 07030, 07020, 07021, 09030, 09040, 07040, 16010, 10070, 10120, 10040 or 04001; t: number 1 to 1440; u: metric or us; w: number 30 to 300; lb: number 66 to 660), e.g. https://how.box/fr/health/calories-burned/?a=12050&t=45&u=us&w=80&lb=180. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, fitness, energy.
  - Agent tools: `calories_burned_calculate` (Energy used during an activity: kcal = MET × body weight (kg) × hours, with the activity's MET value from the 2024 Adult Compendium of Physical Activities (1 MET = 1 kcal/kg/h).); `calories_burned_find_activity` (Finds activities by English words in the tool's list of 204 common activities from the Compendium of Physical Activities.)
- [Calculateur de crédit auto](https://how.box/fr/finance/car-loan/): Combien coûtera votre crédit auto ? Mensualité et coût total d’achat, avec apport, reprise, taxes et frais.
  - Addresses: en https://how.box/finance/car-loan/, en-us https://how.box/en-us/finance/car-loan/, fi https://how.box/fi/finance/car-loan/, de https://how.box/de/finance/car-loan/, es https://how.box/es/finance/car-loan/, fr https://how.box/fr/finance/car-loan/, sv https://how.box/sv/finance/car-loan/, it https://how.box/it/finance/car-loan/, et https://how.box/et/finance/car-loan/
  - Link to an answer: https://how.box/fr/finance/car-loan/?p={p}&d={d}&t={t}&x={x}&f={f}&r={r}&n={n}&c={c} (p: number 0 to 1e7; d: number 0 to 1e7; t: number 0 to 1e7; x: number 0 to 100; f: number 0 to 1e7; r: number 0 to 100; n: whole number 1 to 120; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL), e.g. https://how.box/fr/finance/car-loan/?p=25000&d=5000&t=0&x=0&f=0&r=6&n=60&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, loans, interest, costs.
  - Agent tools: `car_loan_calculate` (Estimate fixed-rate monthly car payments and amortization.)
- [Convertisseur de casse](https://how.box/fr/text/case/): Quelles majuscules donner à votre texte ? Changez la casse et copiez la version souhaitée.
  - Addresses: en https://how.box/text/case/, en-us https://how.box/en-us/text/case/, fi https://how.box/fi/text/case/, de https://how.box/de/text/case/, es https://how.box/es/text/case/, fr https://how.box/fr/text/case/, sv https://how.box/sv/text/case/, it https://how.box/it/text/case/, et https://how.box/et/text/case/
  - Link to an answer: https://how.box/fr/text/case/? (), e.g. https://how.box/fr/text/case/?. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter.
  - Agent tools: `case_convert` (Converts text to upper, lower, title (every word), sentence, camel, pascal, snake, kebab or constant case.)
- [Pendule d’échecs](https://how.box/fr/datetime/chess-clock/): Combien de temps reste-t-il à chaque joueur ? Deux pendules avec incrément ou délai, compteur de coups et chute du drapeau à zéro.
  - Addresses: en https://how.box/datetime/chess-clock/, en-us https://how.box/en-us/datetime/chess-clock/, fi https://how.box/fi/datetime/chess-clock/, de https://how.box/de/datetime/chess-clock/, es https://how.box/es/datetime/chess-clock/, fr https://how.box/fr/datetime/chess-clock/, sv https://how.box/sv/datetime/chess-clock/, it https://how.box/it/datetime/chess-clock/, et https://how.box/et/datetime/chess-clock/
  - Link to an answer: https://how.box/fr/datetime/chess-clock/?m={m}&i={i}&t={t} (m: whole number 1 to 180; i: whole number 0 to 180; t: increment or delay), e.g. https://how.box/fr/datetime/chess-clock/?m=10&i=0&t=increment. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, sound.
  - Agent tools: `chess_clock_time_budget` (The time one player has under a chess time control.)
- [Recherche d’accords](https://how.box/fr/music/chords/): Comment jouer cet accord ? Choisissez une fondamentale et un type d’accord pour voir notes, formule et touches, l’écouter, ou retrouver son nom à partir de notes.
  - Addresses: en https://how.box/music/chords/, en-us https://how.box/en-us/music/chords/, fi https://how.box/fi/music/chords/, de https://how.box/de/music/chords/, es https://how.box/es/music/chords/, fr https://how.box/fr/music/chords/, sv https://how.box/sv/music/chords/, it https://how.box/it/music/chords/, et https://how.box/et/music/chords/
  - Link to an answer: https://how.box/fr/music/chords/?m={m}&r={r}&q={q}&n={n} (m: find or identify; r: C, C#, Db, D, D#, Eb, E, F, F#, Gb, G, G#, Ab, A, A#, Bb or B; q: major, minor, 7, maj7, m7, dim, aug, sus2, sus4, add9, 6, m6 or 9; n: text), e.g. https://how.box/fr/music/chords/?m=identify&r=Bb&q=m7&n=0%2C4%2C7. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: sound.
  - Agent tools: `chords_find` (Finds the notes of a chord.); `chords_identify` (Names the chords made of exactly these notes among the 13 qualities (major, minor, 7, maj7, m7, dim, aug, sus2, sus4, add9, 6, m6, 9).)
- [Cycle des quintes](https://how.box/fr/music/circle-of-fifths/): Combien de dièses ou de bémols a votre tonalité ? Choisissez une tonalité pour voir armure, tonalité relative, gamme et accords, puis les écouter au piano.
  - Addresses: en https://how.box/music/circle-of-fifths/, en-us https://how.box/en-us/music/circle-of-fifths/, fi https://how.box/fi/music/circle-of-fifths/, de https://how.box/de/music/circle-of-fifths/, es https://how.box/es/music/circle-of-fifths/, fr https://how.box/fr/music/circle-of-fifths/, sv https://how.box/sv/music/circle-of-fifths/, it https://how.box/it/music/circle-of-fifths/, et https://how.box/et/music/circle-of-fifths/
  - Link to an answer: https://how.box/fr/music/circle-of-fifths/?k={k} (k: C, G, D, A, E, B, F#, Gb, Db, Ab, Eb, Bb, F, Am, Em, Bm, F#m, C#m, G#m, D#m, Ebm, Bbm, Fm, Cm, Gm or Dm), e.g. https://how.box/fr/music/circle-of-fifths/?k=Bb. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: sound.
  - Agent tools: `circle_of_fifths_key` (Looks up a musical key on the circle of fifths.)
- [Lecteur de codes QR et codes-barres](https://how.box/fr/media/code-scan/): Comment scanner un code QR ou un code-barres ? Scannez avec la caméra ou une image pour voir le contenu du code et la destination réelle d’un lien avant de l’ouvrir.
  - Addresses: en https://how.box/media/code-scan/, en-us https://how.box/en-us/media/code-scan/, fi https://how.box/fi/media/code-scan/, de https://how.box/de/media/code-scan/, es https://how.box/es/media/code-scan/, fr https://how.box/fr/media/code-scan/, sv https://how.box/sv/media/code-scan/, it https://how.box/it/media/code-scan/, et https://how.box/et/media/code-scan/
  - Link to an answer: https://how.box/fr/media/code-scan/?f={f} (f: all, qr or linear), e.g. https://how.box/fr/media/code-scan/?f=qr. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker, encoding.
  - Agent tools: `code_scan_inspect_text` (Explains the text of a scanned QR code or barcode before anyone acts on it: what it is and where a link really leads.)
  - Preset [Lecteur de codes QR](https://how.box/fr/media/qr-scan/): Comment scanner un code QR en sécurité ? The same tool, preconfigured.
  - Preset [Lecteur de codes-barres](https://how.box/fr/media/barcode-scan/): Comment lire un code-barres ? The same tool, preconfigured.
- [Convertisseur de couleurs](https://how.box/fr/web/color/): Comment écrire une couleur en HEX, RGB ou HSL ? Choisissez ou saisissez une couleur, copiez-la en HEX, RGB, HSL, HWB ou OKLCH et trouvez son nom CSS le plus proche.
  - Addresses: en https://how.box/web/color/, en-us https://how.box/en-us/web/color/, fi https://how.box/fi/web/color/, de https://how.box/de/web/color/, es https://how.box/es/web/color/, fr https://how.box/fr/web/color/, sv https://how.box/sv/web/color/, it https://how.box/it/web/color/, et https://how.box/et/web/color/
  - Link to an answer: https://how.box/fr/web/color/?c={c} (c: text), e.g. https://how.box/fr/web/color/?c=%232563eb. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, color.
  - Agent tools: `color_convert` (Converts one CSS color between HEX, RGB, HSL, HWB and OKLCH and finds the nearest CSS named color and a row of tints and shades.)
- [Calculateur de combinaisons et permutations](https://how.box/fr/math/combinations/): Combien de façons y a-t-il de les choisir ? Nombre exact de combinaisons et de permutations, avec ou sans répétition, et la probabilité d’un tirage précis.
  - Addresses: en https://how.box/math/combinations/, en-us https://how.box/en-us/math/combinations/, fi https://how.box/fi/math/combinations/, de https://how.box/de/math/combinations/, es https://how.box/es/math/combinations/, fr https://how.box/fr/math/combinations/, sv https://how.box/sv/math/combinations/, it https://how.box/it/math/combinations/, et https://how.box/et/math/combinations/
  - Link to an answer: https://how.box/fr/math/combinations/?n={n}&k={k}&o={o}&r={r}&v={v} (n: whole number 0 to 1e6; k: whole number 0 to 1000; o: boolean; r: boolean; v: count or lottery), e.g. https://how.box/fr/math/combinations/?n=49&k=6&o=0&r=0&v=lottery. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, statistics.
  - Agent tools: `combinations_count` (Exact number of ways to pick k of n items.)
  - Preset [Calculateur de chances au loto](https://how.box/fr/math/lottery-odds/): Quelles sont les chances de gagner au loto ? The same tool, preconfigured.
- [Calculateur d’intérêts composés](https://how.box/fr/finance/compound-interest/): Combien rapportera votre épargne avec les intérêts composés ? Solde final, versements et intérêts gagnés, année par année.
  - Addresses: en https://how.box/finance/compound-interest/, en-us https://how.box/en-us/finance/compound-interest/, fi https://how.box/fi/finance/compound-interest/, de https://how.box/de/finance/compound-interest/, es https://how.box/es/finance/compound-interest/, fr https://how.box/fr/finance/compound-interest/, sv https://how.box/sv/finance/compound-interest/, it https://how.box/it/finance/compound-interest/, et https://how.box/et/finance/compound-interest/
  - Link to an answer: https://how.box/fr/finance/compound-interest/?p={p}&d={d}&f={f}&w={w}&r={r}&n={n}&y={y}&c={c} (p: number 0 to 1e9; d: number 0 to 1e8; f: month or year; w: end or start; r: number 0 to 50; n: year, quarter, month or day; y: whole number 1 to 100; c: text), e.g. https://how.box/fr/finance/compound-interest/?p=10000&d=100&f=month&w=end&r=5&n=month&y=20&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, savings, interest.
  - Agent tools: `compound_interest_calculate` (Future value of savings with compound interest and regular deposits.)
- [Calculateur de béton](https://how.box/fr/everyday/concrete/): Combien de béton me faut-il ? Mètres ou yards cubes de béton et sacs de béton prêt à l’emploi pour une dalle, une fondation ou des trous de poteaux.
  - Addresses: en https://how.box/everyday/concrete/, en-us https://how.box/en-us/everyday/concrete/, fi https://how.box/fi/everyday/concrete/, de https://how.box/de/everyday/concrete/, es https://how.box/es/everyday/concrete/, fr https://how.box/fr/everyday/concrete/, sv https://how.box/sv/everyday/concrete/, it https://how.box/it/everyday/concrete/, et https://how.box/et/everyday/concrete/
  - Link to an answer: https://how.box/fr/everyday/concrete/?k={k}&l={l}&w={w}&dm={dm}&d={d}&n={n}&u={u}&du={du}&x={x}&y={y}&yu={yu} (k: slab, footing or post; l: number 0.01 to 1000; w: number 0.01 to 1000; dm: number 0.01 to 1000; d: number 0.005 to 20; n: whole number 1 to 1000; u: m, cm, ft or in; du: cm, mm, m, in or ft; x: number 0 to 50; y: number 1 to 1000; yu: l or ft3), e.g. https://how.box/fr/everyday/concrete/?k=slab&l=3&w=2&dm=0.3&d=0.1&n=1&u=m&du=cm&x=10&y=12&yu=l. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, volume, metric, imperial.
  - Agent tools: `concrete_estimate` (Concrete for a slab or strip footing (length × width × depth) or round post holes (π × (diameter/2)² × depth), times count, plus waste %, and whole bags of pre-mix.)
- [Calculateur d’intervalle de confiance](https://how.box/fr/math/confidence-interval/): Quelle est la précision de l’estimation de votre échantillon ? L’intervalle de confiance d’une moyenne ou d’une proportion à partir d’un échantillon, avec la marge d’erreur et la méthode utilisée.
  - Addresses: en https://how.box/math/confidence-interval/, en-us https://how.box/en-us/math/confidence-interval/, fi https://how.box/fi/math/confidence-interval/, de https://how.box/de/math/confidence-interval/, es https://how.box/es/math/confidence-interval/, fr https://how.box/fr/math/confidence-interval/, sv https://how.box/sv/math/confidence-interval/, it https://how.box/it/math/confidence-interval/, et https://how.box/et/math/confidence-interval/
  - Link to an answer: https://how.box/fr/math/confidence-interval/?k={k}&c={c}&n={n}&mu={mu}&sd={sd}&d={d}&x={x}&w={w} (k: mean or proportion; c: number 50 to 99.99; n: whole number 1 to 1e9; mu: number -1e12 to 1e12; sd: number 0 to 1e12; d: t or z; x: whole number 0 to 1e9; w: wilson or wald), e.g. https://how.box/fr/math/confidence-interval/?k=mean&c=95&n=30&mu=50&sd=10&d=t&x=12&w=wilson. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, statistics.
  - Agent tools: `confidence_interval_calculate` (Two-sided confidence interval at confidence_percent.)
- [Vérificateur de contraste](https://how.box/fr/web/contrast/): Ce texte est-il lisible sur ce fond ? Vérifiez le contraste WCAG, les niveaux respectés et trouvez une couleur proche qui les atteint.
  - Addresses: en https://how.box/web/contrast/, en-us https://how.box/en-us/web/contrast/, fi https://how.box/fi/web/contrast/, de https://how.box/de/web/contrast/, es https://how.box/es/web/contrast/, fr https://how.box/fr/web/contrast/, sv https://how.box/sv/web/contrast/, it https://how.box/it/web/contrast/, et https://how.box/et/web/contrast/
  - Link to an answer: https://how.box/fr/web/contrast/?fg={fg}&bg={bg} (fg: text; bg: text), e.g. https://how.box/fr/web/contrast/?fg=%23767676&bg=%23ffffff. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker, color.
  - Agent tools: `contrast_check` (Checks the WCAG 2.2 contrast of a text color on a background color.)
- [Convertisseur de cuisine](https://how.box/fr/conversion/cooking/): Combien de grammes contient une tasse ? Convertissez les quantités selon l’ingrédient.
  - Addresses: en https://how.box/conversion/cooking/, en-us https://how.box/en-us/conversion/cooking/, fi https://how.box/fi/conversion/cooking/, de https://how.box/de/conversion/cooking/, es https://how.box/es/conversion/cooking/, fr https://how.box/fr/conversion/cooking/, sv https://how.box/sv/conversion/cooking/, it https://how.box/it/conversion/cooking/, et https://how.box/et/conversion/cooking/
  - Link to an answer: https://how.box/fr/conversion/cooking/?v={v}&i={i}&s={s}&from={from}&to={to} (v: number 0 to 1e6; i: flour, sugar, butter, rice, milk, water, honey, oats, cocoa, salt, brown_sugar or olive_oil; s: us or metric; from: cup, tbsp, tsp, g or ml; to: cup, tbsp, tsp, g or ml), e.g. https://how.box/fr/conversion/cooking/?v=1&i=flour&s=us&from=cup&to=g. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter.
  - Agent tools: `cooking_calculate` (Convert cups, tablespoons, teaspoons, grams and millilitres by ingredient.)
  - Preset [Tasse de sucre en grammes](https://how.box/fr/conversion/cup-of-sugar-in-grams/): Combien de grammes pèse une tasse de sucre ? The same tool, preconfigured.
  - Preset [Tasse de beurre en grammes](https://how.box/fr/conversion/cup-of-butter-in-grams/): Combien de grammes pèse une tasse de beurre ? The same tool, preconfigured.
- [Compte à rebours](https://how.box/fr/datetime/countdown/): Combien de temps reste-t-il avant le grand jour ? Jours, heures, minutes et secondes avant une date, le Nouvel An, Noël ou la Saint-Jean, en direct et en plein écran.
  - Addresses: en https://how.box/datetime/countdown/, en-us https://how.box/en-us/datetime/countdown/, fi https://how.box/fi/datetime/countdown/, de https://how.box/de/datetime/countdown/, es https://how.box/es/datetime/countdown/, fr https://how.box/fr/datetime/countdown/, sv https://how.box/sv/datetime/countdown/, it https://how.box/it/datetime/countdown/, et https://how.box/et/datetime/countdown/
  - Link to an answer: https://how.box/fr/datetime/countdown/?to={to}&d={d}&t={t}&z={z}&n={n} (to: date, new_year, christmas_eve, christmas or midsummer_eve; d: text; t: text; z: text; n: text), e.g. https://how.box/fr/datetime/countdown/?to=date&d=2027-06-01&t=18%3A30&z=Europe%2FHelsinki&n=Summer+holiday. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, sound.
  - Agent tools: `countdown_time_left` (Time left until a date and time, or until the next New Year, Christmas Eve, Christmas Day or Midsummer Eve, in an IANA time zone (daylight saving time from the browser's time-zone database).)
  - Preset [Compte à rebours de Noël](https://how.box/fr/datetime/christmas-countdown/): Combien de jours reste-t-il avant Noël ? The same tool, preconfigured.
  - Preset [Compte à rebours du réveillon de Noël](https://how.box/fr/datetime/christmas-eve-countdown/): Combien de jours avant le réveillon de Noël ? The same tool, preconfigured.
  - Preset [Compte à rebours de la Saint-Jean](https://how.box/fr/datetime/midsummer-countdown/): Combien de temps reste-t-il avant la veille de la Saint-Jean ? The same tool, preconfigured.
- [Codes pays](https://how.box/fr/everyday/country-codes/): Quels sont les codes ISO, téléphoniques et internet d’un pays ? Codes ISO 3166 alpha-2, alpha-3 et numériques, indicatifs et domaines de 249 pays et territoires.
  - Addresses: en https://how.box/everyday/country-codes/, en-us https://how.box/en-us/everyday/country-codes/, fi https://how.box/fi/everyday/country-codes/, de https://how.box/de/everyday/country-codes/, es https://how.box/es/everyday/country-codes/, fr https://how.box/fr/everyday/country-codes/, sv https://how.box/sv/everyday/country-codes/, it https://how.box/it/everyday/country-codes/, et https://how.box/et/everyday/country-codes/
  - Link to an answer: https://how.box/fr/everyday/country-codes/?q={q}&r={r}&c={c}&v={v} (q: text; r: (empty), africa, americas, asia, europe, oceania or antarctica; c: text; v: codes, calling or aircraft), e.g. https://how.box/fr/everyday/country-codes/?q=finland&r=europe&c=FI&v=calling. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, network.
  - Agent tools: `country_codes_lookup` (Searches country and territory codes by name (English or Finnish, accents and case ignored) or by any code (alpha-2, alpha-3, numeric, calling code, ccTLD); best matches first.); `country_codes_get` (Gets one country or territory by its ISO 3166-1 alpha-2, alpha-3 or numeric code or its ccTLD.); `country_codes_registration` (Finds the state of registry of an aircraft from its registration (OH-LWA → Finland, N123AB → United States, JA801A → Japan) by the nationality mark it begins with (ICAO Annex 7; the longest matching mark wins, so B-H is Hong Kong).)
  - Preset [Indicatifs téléphoniques internationaux](https://how.box/fr/everyday/calling-codes/): Comment appeler un numéro dans un autre pays ? The same tool, preconfigured.
  - Preset [Préfixes d’immatriculation des aéronefs](https://how.box/fr/everyday/aircraft-prefixes/): Dans quel pays cet aéronef est-il immatriculé ? The same tool, preconfigured.
- [Remboursement de carte de crédit](https://how.box/fr/finance/credit-card/): Combien de temps faut-il pour rembourser votre carte de crédit ? Voyez en combien de mois le solde tombe à zéro et ce que coûtent les intérêts, avec un paiement fixe ou le minimum de la carte.
  - Addresses: en https://how.box/finance/credit-card/, en-us https://how.box/en-us/finance/credit-card/, fi https://how.box/fi/finance/credit-card/, de https://how.box/de/finance/credit-card/, es https://how.box/es/finance/credit-card/, fr https://how.box/fr/finance/credit-card/, sv https://how.box/sv/finance/credit-card/, it https://how.box/it/finance/credit-card/, et https://how.box/et/finance/credit-card/
  - Link to an answer: https://how.box/fr/finance/credit-card/?b={b}&r={r}&m={m}&p={p}&mp={mp}&mf={mf}&mi={mi}&c={c} (b: number 0 to 1e7; r: number 0 to 100; m: fixed or minimum; p: number 0 to 1e7; mp: number 0.1 to 100; mf: number 0 to 1e7; mi: boolean; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL), e.g. https://how.box/fr/finance/credit-card/?b=3000&r=20&m=fixed&p=150&mp=3&mf=20&mi=0&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, loans, interest, costs.
  - Agent tools: `credit_card_calculate` (Credit card payoff: months until the balance is zero and the interest paid, at a fixed monthly payment (mode "fixed") or the card's minimum payment rule (mode "minimum": percent of the balance, a floor amount, optionally plus the month's interest).)
- [Calculateur de vent traversier](https://how.box/fr/aviation/crosswind/): Quel vent traversier souffle sur la piste ? Vent traversier, de face ou arrière, avec rafales, schéma de piste et limite de votre avion.
  - Addresses: en https://how.box/aviation/crosswind/, en-us https://how.box/en-us/aviation/crosswind/, fi https://how.box/fi/aviation/crosswind/, de https://how.box/de/aviation/crosswind/, es https://how.box/es/aviation/crosswind/, fr https://how.box/fr/aviation/crosswind/, sv https://how.box/sv/aviation/crosswind/, it https://how.box/it/aviation/crosswind/, et https://how.box/et/aviation/crosswind/
  - Link to an answer: https://how.box/fr/aviation/crosswind/?r={r}&h={h}&d={d}&s={s}&g={g}&u={u}&x={x} (r: whole number 1 to 36; h: whole number 1 to 360; d: number 0 to 360; s: number 0 to 400; g: number 0 to 400; u: kt, kmh, mph or ms; x: number 0 to 400), e.g. https://how.box/fr/aviation/crosswind/?r=22&h=223&d=250&s=15&g=25&u=kt&x=15. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, flight, weather, speed.
  - Agent tools: `crosswind_calculate` (Headwind/tailwind and crosswind components of a wind on a runway (FAA-H-8083-25C ch.)
- [Convertisseur d’unités CSS](https://how.box/fr/conversion/css-units/): Combien de rem font ces pixels ? Convertissez des longueurs CSS entre px, rem, em, pt, pc, in, cm, mm et Q selon votre taille de police.
  - Addresses: en https://how.box/conversion/css-units/, en-us https://how.box/en-us/conversion/css-units/, fi https://how.box/fi/conversion/css-units/, de https://how.box/de/conversion/css-units/, es https://how.box/es/conversion/css-units/, fr https://how.box/fr/conversion/css-units/, sv https://how.box/sv/conversion/css-units/, it https://how.box/it/conversion/css-units/, et https://how.box/et/conversion/css-units/
  - Link to an answer: https://how.box/fr/conversion/css-units/?v={v}&from={from}&to={to}&fs={fs} (v: number 0 to 1e15; from: px, rem, em, pt, pc, in, cm, mm or q; to: px, rem, em, pt, pc, in, cm, mm or q; fs: number 1 to 400), e.g. https://how.box/fr/conversion/css-units/?v=1&from=rem&to=px&fs=16. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, length.
  - Agent tools: `css_units_convert` (Converts a CSS length between units using exact definitions (1 in = 96 px = 2.54 cm, 1 pt = 1/72 in = 4/3 px, 1 pc = 16 px, 1 cm = 96/2.54 px, 1 mm = 1/10 cm, 1 Q = 1/40 cm; 1 rem and 1 em = the font size in px (context, default 16); W3C CSS Values and Units Level 4 §6).)
  - Preset [px en rem](https://how.box/fr/conversion/px-to-rem/): Combien de rem font autant de pixels ? The same tool, preconfigured.
- [Convertisseur de devises](https://how.box/fr/finance/currency/): Combien vaut ce montant dans une autre devise ? Conversion entre environ 30 devises aux taux quotidiens de la Banque centrale européenne, avec leur date.
  - Addresses: en https://how.box/finance/currency/, en-us https://how.box/en-us/finance/currency/, fi https://how.box/fi/finance/currency/, de https://how.box/de/finance/currency/, es https://how.box/es/finance/currency/, fr https://how.box/fr/finance/currency/, sv https://how.box/sv/finance/currency/, it https://how.box/it/finance/currency/, et https://how.box/et/finance/currency/
  - Link to an answer: https://how.box/fr/finance/currency/?a={a}&f={f}&t={t} (a: number 0 to 1e12; f: text; t: text), e.g. https://how.box/fr/finance/currency/?a=100&f=EUR&t=USD. Served answer coverage: none (computed in the browser)
  - Uses our server; server limits: 120 requests/minute per visitor. Tags: converter, currency, costs.
  - Agent tools: `currency_convert` (Converts an amount of money between two currencies with the European Central Bank euro foreign exchange reference rates (about 30 currencies, set once a working day; cross rates through the euro).); `currency_rates` (Lists the European Central Bank euro foreign exchange reference rates of the latest working day, as units of every other currency per 1 unit of base (default EUR; cross rates through the euro, 6 significant digits).)
- [Codes des devises](https://how.box/fr/finance/currency-codes/): Quel est le code de devise de l’euro, du yen ou du dollar ? Toutes les devises en circulation avec leur code ISO 4217, leur code numérique, leur symbole, leurs décimales et les pays qui les utilisent, dans votre langue.
  - Addresses: en https://how.box/finance/currency-codes/, en-us https://how.box/en-us/finance/currency-codes/, fi https://how.box/fi/finance/currency-codes/, de https://how.box/de/finance/currency-codes/, es https://how.box/es/finance/currency-codes/, fr https://how.box/fr/finance/currency-codes/, sv https://how.box/sv/finance/currency-codes/, it https://how.box/it/finance/currency-codes/, et https://how.box/et/finance/currency-codes/
  - Link to an answer: https://how.box/fr/finance/currency-codes/?q={q}&d={d}&c={c} (q: text; d: (empty), 0, 2 or 3; c: text), e.g. https://how.box/fr/finance/currency-codes/?q=yen&d=0&c=JPY. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, currency.
  - Agent tools: `currency_codes_lookup` (Searches current currencies by code, numeric code, country code or country name (any site language); best matches first.); `currency_codes_get` (Gets one current currency by its ISO 4217 code or numeric code, or the currency of a country by its ISO 3166-1 alpha-2 code.)
- [Voyants du tableau de bord](https://how.box/fr/vehicles/dashboard-lights/): Que signifie ce voyant sur votre tableau de bord ? Trouvez un voyant de voiture par son symbole ou son nom : ce qu’il signifie, son urgence selon sa couleur et ce qu’il faut faire.
  - Addresses: en https://how.box/vehicles/dashboard-lights/, en-us https://how.box/en-us/vehicles/dashboard-lights/, fi https://how.box/fi/vehicles/dashboard-lights/, de https://how.box/de/vehicles/dashboard-lights/, es https://how.box/es/vehicles/dashboard-lights/, fr https://how.box/fr/vehicles/dashboard-lights/, sv https://how.box/sv/vehicles/dashboard-lights/, it https://how.box/it/vehicles/dashboard-lights/, et https://how.box/et/vehicles/dashboard-lights/
  - Link to an answer: https://how.box/fr/vehicles/dashboard-lights/?q={q}&c={c}&l={l} (q: text; c: (empty), red, amber, green or blue; l: text), e.g. https://how.box/fr/vehicles/dashboard-lights/?q=oil&c=red&l=engine-check. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference.
  - Agent tools: `dashboard_lights_lookup` (Finds car dashboard warning and indicator lights by name, by what the symbol shows (oil can, thermometer, exclamation mark in a circle, tortoise) or by a word (brake, tyre, diesel); best matches first.); `dashboard_lights_get` (Gets one dashboard light by its id.)
- [Convertisseur de tailles de données](https://how.box/fr/conversion/data-size/): Combien de données cela fait-il dans d’autres unités ? Convertissez octets, kilooctets, mégaoctets, gigaoctets, Mio, Gio et bits, en distinguant bases 1 000 et 1 024.
  - Addresses: en https://how.box/conversion/data-size/, en-us https://how.box/en-us/conversion/data-size/, fi https://how.box/fi/conversion/data-size/, de https://how.box/de/conversion/data-size/, es https://how.box/es/conversion/data-size/, fr https://how.box/fr/conversion/data-size/, sv https://how.box/sv/conversion/data-size/, it https://how.box/it/conversion/data-size/, et https://how.box/et/conversion/data-size/
  - Link to an answer: https://how.box/fr/conversion/data-size/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: bit, byte, kb, mb, gb, tb, kib, mib, gib, tib, kbit, mbit or gbit; to: bit, byte, kb, mb, gb, tb, kib, mib, gib, tib, kbit, mbit or gbit), e.g. https://how.box/fr/conversion/data-size/?v=1&from=gb&to=mb. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, encoding.
  - Agent tools: `data_size_convert` (Converts a data size between units using exact definitions (1 byte = 8 bits; SI decimal kB, MB, GB, TB = 10^3, 10^6, 10^9, 10^12 bytes; IEC binary KiB, MiB, GiB, TiB = 2^10, 2^20, 2^30, 2^40 bytes; kbit, Mbit, Gbit = 10^3, 10^6, 10^9 bits; BIPM SI Brochure, IEC 80000-13).)
  - Preset [Gigaoctets en gibioctets](https://how.box/fr/conversion/gb-to-gib/): Combien de gibioctets vaut un gigaoctet ? The same tool, preconfigured.
- [Écart entre deux dates](https://how.box/fr/datetime/date-diff/): Combien de jours séparent vos dates ? Jours calendaires, mois entiers et jours travaillés finlandais.
  - Addresses: en https://how.box/datetime/date-diff/, en-us https://how.box/en-us/datetime/date-diff/, fi https://how.box/fi/datetime/date-diff/, de https://how.box/de/datetime/date-diff/, es https://how.box/es/datetime/date-diff/, fr https://how.box/fr/datetime/date-diff/, sv https://how.box/sv/datetime/date-diff/, it https://how.box/it/datetime/date-diff/, et https://how.box/et/datetime/date-diff/
  - Link to an answer: https://how.box/fr/datetime/date-diff/?f={f}&t={t}&i={i} (f: text; t: text; i: boolean), e.g. https://how.box/fr/datetime/date-diff/?f=2026-01-01&t=2027-01-01&i=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `date_diff_calculate` (Count calendar days, weeks and days, calendar months and days, years/months/days and Finnish working days between ordered dates (1992–2100).)
- [Calculateur de jours-amende](https://how.box/fr/finance/day-fine/): Combien coûte un jour-amende en Finlande ? Un jour-amende et l’amende totale selon votre revenu net et vos personnes à charge, d’après le Code pénal finlandais.
  - Addresses: en https://how.box/finance/day-fine/, en-us https://how.box/en-us/finance/day-fine/, fi https://how.box/fi/finance/day-fine/, de https://how.box/de/finance/day-fine/, es https://how.box/es/finance/day-fine/, fr https://how.box/fr/finance/day-fine/, sv https://how.box/sv/finance/day-fine/, it https://how.box/it/finance/day-fine/, et https://how.box/et/finance/day-fine/
  - Link to an answer: https://how.box/fr/finance/day-fine/?i={i}&d={d}&n={n} (i: number 0 to 1e7; d: whole number 0 to 20; n: whole number 1 to 120), e.g. https://how.box/fr/finance/day-fine/?i=3255&d=2&n=12. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, costs. Countries: FI (Finlande).
  - Agent tools: `day_fine_calculate` (Finland only: one day-fine (päiväsakko) and the total fine under Rikoslaki 2 a luku and decree 609/1999.)
- [Jour de la semaine](https://how.box/fr/datetime/day-of-week/): Quel jour de la semaine est-ce ? Le jour de semaine de toute date et son écart en jours avec aujourd’hui.
  - Addresses: en https://how.box/datetime/day-of-week/, en-us https://how.box/en-us/datetime/day-of-week/, fi https://how.box/fi/datetime/day-of-week/, de https://how.box/de/datetime/day-of-week/, es https://how.box/es/datetime/day-of-week/, fr https://how.box/fr/datetime/day-of-week/, sv https://how.box/sv/datetime/day-of-week/, it https://how.box/it/datetime/day-of-week/, et https://how.box/et/datetime/day-of-week/
  - Link to an answer: https://how.box/fr/datetime/day-of-week/?d={d} (d: text), e.g. https://how.box/fr/datetime/day-of-week/?d=2030-01-01. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, reference.
  - Agent tools: `day_of_week_of_date` (The weekday of a date (default: today on the visitor's device), in the Gregorian calendar from 1583: ISO weekday number (1 Monday to 7 Sunday) and its English name, how many days the date is from today (negative: in the past, 0: today), the day of the year and the ISO 8601 week.)
- [Remboursement de dettes](https://how.box/fr/finance/debt-payoff/): En combien de temps pouvez-vous rembourser toutes vos dettes ? Voyez quand vous n’aurez plus de dettes et ce que coûtent les intérêts, en remboursant d’abord le taux le plus élevé ou la plus petite dette.
  - Addresses: en https://how.box/finance/debt-payoff/, en-us https://how.box/en-us/finance/debt-payoff/, fi https://how.box/fi/finance/debt-payoff/, de https://how.box/de/finance/debt-payoff/, es https://how.box/es/finance/debt-payoff/, fr https://how.box/fr/finance/debt-payoff/, sv https://how.box/sv/finance/debt-payoff/, it https://how.box/it/finance/debt-payoff/, et https://how.box/et/finance/debt-payoff/
  - Link to an answer: https://how.box/fr/finance/debt-payoff/?d={d}&b={b}&s={s}&c={c} (d: array; b: number 0 to 1e7; s: avalanche or snowball; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL), e.g. https://how.box/fr/finance/debt-payoff/?d=%7E1%3Ad1.2500.22.60_d2.8000.7.200_d3.1200.12.40&b=500&s=avalanche&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, loans, interest, costs.
  - Agent tools: `debt_payoff_calculate` (Debt payoff plan for several debts from one monthly budget, by both orders: "avalanche" (highest rate first; ties smaller balance) and "snowball" (smallest balance first; ties higher rate).)
- [Convertisseur d’heures décimales](https://how.box/fr/datetime/decimal-hours/): Combien d’heures décimales font 7 heures 30 minutes ? Les heures et minutes en heures décimales et inversement, et le total d’une feuille de temps sous les deux formes.
  - Addresses: en https://how.box/datetime/decimal-hours/, en-us https://how.box/en-us/datetime/decimal-hours/, fi https://how.box/fi/datetime/decimal-hours/, de https://how.box/de/datetime/decimal-hours/, es https://how.box/es/datetime/decimal-hours/, fr https://how.box/fr/datetime/decimal-hours/, sv https://how.box/sv/datetime/decimal-hours/, it https://how.box/it/datetime/decimal-hours/, et https://how.box/et/datetime/decimal-hours/
  - Link to an answer: https://how.box/fr/datetime/decimal-hours/?t={t}&d={d} (t: text; d: whole number 0 to 4), e.g. https://how.box/fr/datetime/decimal-hours/?t=7%3A30%2B8%3A15&d=2. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, calculator, salary.
  - Agent tools: `decimal_hours_convert` (Convert hours and minutes to decimal hours and back, and add up a timesheet.)
- [Convertisseur de masse volumique](https://how.box/fr/conversion/density/): Combien fait cette masse volumique dans d’autres unités ? Convertissez entre kg/m³, g/cm³, kg/L, g/L, lb/ft³, lb/in³, oz/in³ et livres par gallon.
  - Addresses: en https://how.box/conversion/density/, en-us https://how.box/en-us/conversion/density/, fi https://how.box/fi/conversion/density/, de https://how.box/de/conversion/density/, es https://how.box/es/conversion/density/, fr https://how.box/fr/conversion/density/, sv https://how.box/sv/conversion/density/, it https://how.box/it/conversion/density/, et https://how.box/et/conversion/density/
  - Link to an answer: https://how.box/fr/conversion/density/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: kg_m3, g_cm3, kg_l, g_l, lb_ft3, lb_in3, oz_in3, lb_gal_us or lb_gal_imp; to: kg_m3, g_cm3, kg_l, g_l, lb_ft3, lb_in3, oz_in3, lb_gal_us or lb_gal_imp), e.g. https://how.box/fr/conversion/density/?v=1&from=g_cm3&to=kg_m3. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, weight, volume, metric, imperial.
  - Agent tools: `density_convert` (Converts a density between units using exact definitions (1 g/cm³ = 1 kg/L = 1000 kg/m³, 1 g/L = 1 kg/m³, 1 lb/ft³ = 0.45359237 / 0.3048³ kg/m³ ≈ 16.01846, 1 lb/in³ ≈ 27679.90, 1 oz/in³ ≈ 1729.994, 1 lb/gal (US) ≈ 119.8264, 1 lb/gal (UK) ≈ 99.77637 kg/m³; NIST SP 811 B.9).)
- [Altitude-densité](https://how.box/fr/aviation/density-altitude/): Quelle est l’altitude-densité aujourd’hui ? Altitude-pression et altitude-densité selon altitude du terrain, QNH et température, avec les effets sur le décollage.
  - Addresses: en https://how.box/aviation/density-altitude/, en-us https://how.box/en-us/aviation/density-altitude/, fi https://how.box/fi/aviation/density-altitude/, de https://how.box/de/aviation/density-altitude/, es https://how.box/es/aviation/density-altitude/, fr https://how.box/fr/aviation/density-altitude/, sv https://how.box/sv/aviation/density-altitude/, it https://how.box/it/aviation/density-altitude/, et https://how.box/et/aviation/density-altitude/
  - Link to an answer: https://how.box/fr/aviation/density-altitude/?e={e}&eu={eu}&q={q}&qu={qu}&t={t}&d={d}&tu={tu} (e: number; eu: ft or m; q: number; qu: hpa or inhg; t: number; d: text; tu: c or f), e.g. https://how.box/fr/aviation/density-altitude/?e=2000&eu=ft&q=1013&qu=hpa&t=30&d=15&tu=c. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, flight, weather, temperature.
  - Agent tools: `density_altitude_calculate` (Pressure altitude and density altitude of an airfield from its elevation, the altimeter setting QNH and the outside air temperature, with an optional dew point for the humidity effect (US NWS virtual-temperature method).)
- [Calculateur de descente](https://how.box/fr/aviation/descent/): À quelle distance commencer la descente ? Début de descente, vitesse verticale et durée selon l’angle ou le taux, comparés à la règle 3:1.
  - Addresses: en https://how.box/aviation/descent/, en-us https://how.box/en-us/aviation/descent/, fi https://how.box/fi/aviation/descent/, de https://how.box/de/aviation/descent/, es https://how.box/es/aviation/descent/, fr https://how.box/fr/aviation/descent/, sv https://how.box/sv/aviation/descent/, it https://how.box/it/aviation/descent/, et https://how.box/et/aviation/descent/
  - Link to an answer: https://how.box/fr/aviation/descent/?a={a}&t={t}&au={au}&gs={gs}&su={su}&p={p}&ang={ang}&vs={vs}&vu={vu}&gr={gr} (a: number -2000 to 60000; t: number -2000 to 60000; au: ft or m; gs: number 1 to 1200; su: kt, kmh or mph; p: angle or rate; ang: number 0.5 to 15; vs: number 0.5 to 10000; vu: fpm or ms; gr: number 1 to 80), e.g. https://how.box/fr/aviation/descent/?a=10000&t=2000&au=ft&gs=120&su=kt&p=angle&ang=3&vs=500&vu=fpm&gr=9. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, flight, speed.
  - Agent tools: `descent_calculate` (Descent planning (FAA-H-8083-16B ch.)
- [Calculateur de point de rosée](https://how.box/fr/earth/dew-point/): À quelle température vos vitres vont-elles s’embuer ? Trouvez le point de rosée à partir de la température et de l’humidité, ou l’humidité à partir du point de rosée.
  - Addresses: en https://how.box/earth/dew-point/, en-us https://how.box/en-us/earth/dew-point/, fi https://how.box/fi/earth/dew-point/, de https://how.box/de/earth/dew-point/, es https://how.box/es/earth/dew-point/, fr https://how.box/fr/earth/dew-point/, sv https://how.box/sv/earth/dew-point/, it https://how.box/it/earth/dew-point/, et https://how.box/et/earth/dew-point/
  - Link to an answer: https://how.box/fr/earth/dew-point/?f={f}&t={t}&rh={rh}&td={td}&u={u} (f: dew_point, relative_humidity or temperature; t: number; rh: number 1 to 100; td: number; u: c or f), e.g. https://how.box/fr/earth/dew-point/?f=relative_humidity&t=20&rh=60&td=12&u=c. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, weather, temperature.
  - Agent tools: `dew_point_calculate` (Dew point, relative humidity or air temperature from the other two (Magnus formula, Sonntag 1990 coefficients 6.112 hPa, 17.62, 243.12 °C; valid −45 to 60 °C), plus absolute humidity.)
- [Lanceur de dés](https://how.box/fr/everyday/dice/): Quel nombre donneront les dés ? Lancez un dé ou plusieurs, d20 ou 3d6+2, avec des résultats équitables visibles en plein écran.
  - Addresses: en https://how.box/everyday/dice/, en-us https://how.box/en-us/everyday/dice/, fi https://how.box/fi/everyday/dice/, de https://how.box/de/everyday/dice/, es https://how.box/es/everyday/dice/, fr https://how.box/fr/everyday/dice/, sv https://how.box/sv/everyday/dice/, it https://how.box/it/everyday/dice/, et https://how.box/et/everyday/dice/
  - Link to an answer: https://how.box/fr/everyday/dice/?n={n} (n: text), e.g. https://how.box/fr/everyday/dice/?n=2d6%2B3. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator.
  - Agent tools: `dice_roll` (Rolls dice written in standard dice notation, with the browser's cryptographically secure random generator (every side equally likely).)
- [Calculateur de réduction](https://how.box/fr/everyday/discount/): Combien paierez-vous après la réduction ? Consultez le prix réduit et votre économie.
  - Addresses: en https://how.box/everyday/discount/, en-us https://how.box/en-us/everyday/discount/, fi https://how.box/fi/everyday/discount/, de https://how.box/de/everyday/discount/, es https://how.box/es/everyday/discount/, fr https://how.box/fr/everyday/discount/, sv https://how.box/sv/everyday/discount/, it https://how.box/it/everyday/discount/, et https://how.box/et/everyday/discount/
  - Link to an answer: https://how.box/fr/everyday/discount/?p={p}&d={d}&c={c} (p: number 0 to 1e7; d: number 0 to 100; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL), e.g. https://how.box/fr/everyday/discount/?p=100&d=25&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, costs, currency.
  - Agent tools: `discount_calculate` (Calculate one percentage discount on a price.)
- [Recherche DNS](https://how.box/fr/web/dns/): Comment votre domaine est-il configuré dans le DNS ? Recherchez adresses, serveurs de messagerie et autres enregistrements DNS.
  - Addresses: en https://how.box/web/dns/, en-us https://how.box/en-us/web/dns/, fi https://how.box/fi/web/dns/, de https://how.box/de/web/dns/, es https://how.box/es/web/dns/, fr https://how.box/fr/web/dns/, sv https://how.box/sv/web/dns/, it https://how.box/it/web/dns/, et https://how.box/et/web/dns/
  - Link to an answer: https://how.box/fr/web/dns/?h={h}&t={t} (h: text; t: A, AAAA, CNAME, MX, TXT, NS, SOA or CAA), e.g. https://how.box/fr/web/dns/?h=example.com&t=A. Served answer coverage: none (computed in the browser)
  - Uses our server; server limits: 20 requests/minute per visitor, 300 requests/day per visitor, 20 dns/minute per visitor, 30 requests/minute per target, 50 requests/second per global. Tags: checker, network.
  - Agent tools: `dns_lookup` (Queries one DNS record type from our server: A (default), AAAA, CNAME, MX, TXT, NS, SOA or CAA.)
- [Calculateur de temps de téléchargement](https://how.box/fr/web/download-time/): Combien de temps prendra votre téléchargement ? Saisissez taille du fichier et débit pour estimer la durée d’un téléchargement ou d’un envoi.
  - Addresses: en https://how.box/web/download-time/, en-us https://how.box/en-us/web/download-time/, fi https://how.box/fi/web/download-time/, de https://how.box/de/web/download-time/, es https://how.box/es/web/download-time/, fr https://how.box/fr/web/download-time/, sv https://how.box/sv/web/download-time/, it https://how.box/it/web/download-time/, et https://how.box/et/web/download-time/
  - Link to an answer: https://how.box/fr/web/download-time/?s={s}&su={su}&r={r}&ru={ru}&o={o} (s: number 0 to 1e9; su: byte, kb, mb, gb, tb, mib, gib or tib; r: number 0 to 1e9; ru: kbit, mbit, gbit, kb, mb or gb; o: number 0 to 90), e.g. https://how.box/fr/web/download-time/?s=700&su=mb&r=8&ru=gbit&o=5. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, network.
  - Agent tools: `download_time_calculate` (Time to transfer a file at a connection speed: seconds = bytes ÷ (speed in bytes per second × (1 − overhead ÷ 100)).)
- [Autonomie de vol d’un drone](https://how.box/fr/aviation/drone-flight-time/): Combien de temps mon drone peut-il voler sur une batterie ? Autonomie selon mAh et tension, ou Wh, et consommation moyenne, avec réserve d’atterrissage et énergie en Wh.
  - Addresses: en https://how.box/aviation/drone-flight-time/, en-us https://how.box/en-us/aviation/drone-flight-time/, fi https://how.box/fi/aviation/drone-flight-time/, de https://how.box/de/aviation/drone-flight-time/, es https://how.box/es/aviation/drone-flight-time/, fr https://how.box/fr/aviation/drone-flight-time/, sv https://how.box/sv/aviation/drone-flight-time/, it https://how.box/it/aviation/drone-flight-time/, et https://how.box/et/aviation/drone-flight-time/
  - Link to an answer: https://how.box/fr/aviation/drone-flight-time/?c={c}&cu={cu}&v={v}&u={u}&d={d}&du={du}&r={r} (c: number; cu: mah or wh; v: text; u: number; d: number; du: a or w; r: number), e.g. https://how.box/fr/aviation/drone-flight-time/?c=5000&cu=mah&v=15.4&u=80&d=10&du=a&r=2. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, flight, energy.
  - Agent tools: `drone_flight_time_calculate` (Estimated flight time of a battery-powered drone from the battery capacity (mAh with the nominal voltage, or Wh), the usable share (default 80 %), the average draw (current in A, or power in W such as hover power) and a landing reserve in minutes (default 2).)
- [Règles pour les drones](https://how.box/fr/aviation/drone-rules/): Quelles règles s’appliquent à mon drone ? Catégorie européenne selon poids et classe, avec enregistrement, formation, âge et distances aux personnes.
  - Addresses: en https://how.box/aviation/drone-rules/, en-us https://how.box/en-us/aviation/drone-rules/, fi https://how.box/fi/aviation/drone-rules/, de https://how.box/de/aviation/drone-rules/, es https://how.box/es/aviation/drone-rules/, fr https://how.box/fr/aviation/drone-rules/, sv https://how.box/sv/aviation/drone-rules/, it https://how.box/it/aviation/drone-rules/, et https://how.box/et/aviation/drone-rules/
  - Link to an answer: https://how.box/fr/aviation/drone-rules/?g={g}&c={c}&cam={cam}&toy={toy}&in={in} (g: number 1 to 150000; c: c0, c1, c2, c3, c4, legacy, private or unlabelled; cam: boolean; toy: boolean; in: eu or fi), e.g. https://how.box/fr/aviation/drone-rules/?g=895&c=c1&cam=1&toy=0&in=fi. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker, flight, weight.
  - Agent tools: `drone_rules_check` (Which EU drone rules apply to a drone (Implementing Regulation (EU) 2019/947 and Delegated Regulation (EU) 2019/945, rules from 1 January 2024).)
- [Boîte à rythmes](https://how.box/fr/music/drum-machine/): Comment créer votre rythme de batterie ? Créez un motif de 16 pas avec grosse caisse, caisse claire, charlestons, clap et tom, puis jouez les pads par-dessus.
  - Addresses: en https://how.box/music/drum-machine/, en-us https://how.box/en-us/music/drum-machine/, fi https://how.box/fi/music/drum-machine/, de https://how.box/de/music/drum-machine/, es https://how.box/es/music/drum-machine/, fr https://how.box/fr/music/drum-machine/, sv https://how.box/sv/music/drum-machine/, it https://how.box/it/music/drum-machine/, et https://how.box/et/music/drum-machine/
  - Link to an answer: https://how.box/fr/music/drum-machine/?t={t}&p={p} (t: whole number 40 to 240; p: text), e.g. https://how.box/fr/music/drum-machine/?t=120&p=80a00808aaaa000000000000. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: sound.
  - Agent tools: `drum_machine_pattern` (Sets a 16-step drum pattern on the page and returns its facts.)
- [Changements d’heure](https://how.box/fr/datetime/dst/): Quand change-t-on d’heure la prochaine fois ? Le prochain et le précédent changement d’heure dans tout fuseau horaire, si l’on avance ou recule l’heure, et tous les changements d’une année.
  - Addresses: en https://how.box/datetime/dst/, en-us https://how.box/en-us/datetime/dst/, fi https://how.box/fi/datetime/dst/, de https://how.box/de/datetime/dst/, es https://how.box/es/datetime/dst/, fr https://how.box/fr/datetime/dst/, sv https://how.box/sv/datetime/dst/, it https://how.box/it/datetime/dst/, et https://how.box/et/datetime/dst/
  - Link to an answer: https://how.box/fr/datetime/dst/?z={z}&y={y} (z: text; y: whole number 1970 to 2100), e.g. https://how.box/fr/datetime/dst/?z=Europe%2FHelsinki&y=2027. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: reference.
  - Agent tools: `dst_changes` (Daylight saving time (summer time) clock changes of an IANA time zone, from the browser's time-zone database.)
- [Calculateur de date d’accouchement](https://how.box/fr/health/due-date/): Où en est votre grossesse ? Estimez terme, semaine et trimestre à partir des dernières règles, de la conception ou d’un transfert de FIV.
  - Addresses: en https://how.box/health/due-date/, en-us https://how.box/en-us/health/due-date/, fi https://how.box/fi/health/due-date/, de https://how.box/de/health/due-date/, es https://how.box/es/health/due-date/, fr https://how.box/fr/health/due-date/, sv https://how.box/sv/health/due-date/, it https://how.box/it/health/due-date/, et https://how.box/et/health/due-date/
  - Link to an answer: https://how.box/fr/health/due-date/?m={m}&d={d}&c={c}&on={on} (m: lmp, conception, ivf3 or ivf5; d: text; c: whole number 20 to 45; on: text), e.g. https://how.box/fr/health/due-date/?m=lmp&d=2026-01-01&c=28&on=2026-04-09. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `due_date_calculate` (Estimate pregnancy due date: lmp adds 280 plus cycle minus 28 days; conception adds 266; ivf3 adds 263; ivf5 adds 261.)
- [Calculateur de durées](https://how.box/fr/datetime/duration/): Combien de temps cela représente-t-il ? Calculez l’écart entre deux dates et heures, ajoutez ou soustrayez une durée, ou totalisez des temps hh:mm:ss.
  - Addresses: en https://how.box/datetime/duration/, en-us https://how.box/en-us/datetime/duration/, fi https://how.box/fi/datetime/duration/, de https://how.box/de/datetime/duration/, es https://how.box/es/datetime/duration/, fr https://how.box/fr/datetime/duration/, sv https://how.box/sv/datetime/duration/, it https://how.box/it/datetime/duration/, et https://how.box/et/datetime/duration/
  - Link to an answer: https://how.box/fr/datetime/duration/?m={m}&sd={sd}&st={st}&ed={ed}&et={et}&dy={dy}&hr={hr}&mi={mi}&se={se}&dir={dir}&l={l} (m: between, add or sum; sd: text; st: text; ed: text; et: text; dy: number 0 to 1e9; hr: number 0 to 1e9; mi: number 0 to 1e9; se: number 0 to 1e9; dir: add or subtract; l: text), e.g. https://how.box/fr/datetime/duration/?m=add&sd=2027-03-05&st=08%3A15&ed=2027-03-06&et=12%3A00%3A30&dy=3&hr=5&mi=45&se=20&dir=subtract&l=0%3A30+1%3A15%3A40. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `duration_calculate` (Works with lengths of time, with no time zone (every day has 86400 s; daylight-saving changes are not counted).)
- [Valeurs normalisées des séries E](https://how.box/fr/electronics/e-series/): Quelle valeur normalisée de résistance ou de condensateur est la plus proche ? Trouvez la valeur E3 à E192 la plus proche de celle qu’il vous faut, avec ses voisines et l’écart.
  - Addresses: en https://how.box/electronics/e-series/, en-us https://how.box/en-us/electronics/e-series/, fi https://how.box/fi/electronics/e-series/, de https://how.box/de/electronics/e-series/, es https://how.box/es/electronics/e-series/, fr https://how.box/fr/electronics/e-series/, sv https://how.box/sv/electronics/e-series/, it https://how.box/it/electronics/e-series/, et https://how.box/et/electronics/e-series/
  - Link to an answer: https://how.box/fr/electronics/e-series/?k={k}&v={v}&s={s}&ru={ru}&cu={cu} (k: resistor or capacitor; v: number; s: E3, E6, E12, E24, E48, E96 or E192; ru: milliohm, ohm, kohm or megohm; cu: pf, nf, uf or farad), e.g. https://how.box/fr/electronics/e-series/?k=capacitor&v=4.7e-8&s=E24&ru=kohm&cu=nf. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `e_series_nearest` (Nearest IEC 60063 preferred value (E3 to E192) to a resistor (ohms) or capacitor (farads) value, on a log scale (ties go to the lower value).)
- [Calculateur de coût électrique](https://how.box/fr/finance/electricity-cost/): Combien coûte l’utilisation d’un appareil ? Convertissez puissance, durée quotidienne et tarif électrique en kWh et en coût.
  - Addresses: en https://how.box/finance/electricity-cost/, en-us https://how.box/en-us/finance/electricity-cost/, fi https://how.box/fi/finance/electricity-cost/, de https://how.box/de/finance/electricity-cost/, es https://how.box/es/finance/electricity-cost/, fr https://how.box/fr/finance/electricity-cost/, sv https://how.box/sv/finance/electricity-cost/, it https://how.box/it/finance/electricity-cost/, et https://how.box/et/finance/electricity-cost/
  - Link to an answer: https://how.box/fr/finance/electricity-cost/?w={w}&wu={wu}&h={h}&d={d}&p={p}&c={c} (w: number 0 to 100000; wu: w or kw; h: number 0 to 24; d: whole number 1 to 1000; p: number 0 to 100; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL), e.g. https://how.box/fr/finance/electricity-cost/?w=100&wu=w&h=8&d=30&p=0.25&c=EUR. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, costs, energy.
  - Agent tools: `electricity_cost_calculate` (Energy use and running cost of an appliance.)
- [Calculateur du coût employeur](https://how.box/fr/finance/employer-cost/): Combien un salarié coûte-t-il à l’employeur en Finlande ? Ce qu’un salaire mensuel coûte à un employeur finlandais avec les cotisations retraite, chômage et assurance maladie.
  - Addresses: en https://how.box/finance/employer-cost/, en-us https://how.box/en-us/finance/employer-cost/, fi https://how.box/fi/finance/employer-cost/, de https://how.box/de/finance/employer-cost/, es https://how.box/es/finance/employer-cost/, fr https://how.box/fr/finance/employer-cost/, sv https://how.box/sv/finance/employer-cost/, it https://how.box/it/finance/employer-cost/, et https://how.box/et/finance/employer-cost/
  - Link to an answer: https://how.box/fr/finance/employer-cost/?w={w}&b={b}&pr={pr}&acc={acc}&gl={gl} (w: number 0 to 1e7; b: average, fixed or occasional; pr: number 0 to 1e11; acc: number 0 to 10; gl: number 0 to 10), e.g. https://how.box/fr/finance/employer-cost/?w=3500&b=fixed&pr=5000000&acc=0.5&gl=0.06. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, salary, costs. Countries: FI (Finlande).
  - Agent tools: `employer_cost_calculate` (Finland only: what monthly gross wages cost the employer with the statutory contributions of the year (2026: TyEL employer share 17.1 % on average, fixed and occasional rates; unemployment insurance 0.31 %, 1.23 % on payroll above 2 509 500 €; health insurance 1.91 %) plus accident and group life insurance at the percentages the insurer charges (inputs).)
- [Convertisseur d’énergie](https://how.box/fr/conversion/energy/): Combien vaut cette énergie dans d’autres unités ? Convertissez joules, kilowatts-heures, kilocalories, BTU et autres selon leurs définitions exactes.
  - Addresses: en https://how.box/conversion/energy/, en-us https://how.box/en-us/conversion/energy/, fi https://how.box/fi/conversion/energy/, de https://how.box/de/conversion/energy/, es https://how.box/es/conversion/energy/, fr https://how.box/fr/conversion/energy/, sv https://how.box/sv/conversion/energy/, it https://how.box/it/conversion/energy/, et https://how.box/et/conversion/energy/
  - Link to an answer: https://how.box/fr/conversion/energy/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: j, kj, wh, kwh, mj, cal, kcal, btu or ev; to: j, kj, wh, kwh, mj, cal, kcal, btu or ev), e.g. https://how.box/fr/conversion/energy/?v=1&from=kwh&to=mj. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, energy, metric.
  - Agent tools: `energy_convert` (Converts an energy between units using exact definitions (1 Wh = 3600 J, 1 kWh = 3.6 MJ, thermochemical calorie 4.184 J so 1 kcal = 4.184 kJ, International Table BTU 1055.05585262 J, 1 eV = 1.602176634e-19 J; BIPM SI Brochure, NIST SP 811 B.8).)
  - Preset [Kilocalories en kilojoules](https://how.box/fr/conversion/kcal-to-kj/): Combien de kilojoules vaut une kilocalorie ? The same tool, preconfigured.
- [Calculateur de recharge de voiture électrique](https://how.box/fr/vehicles/ev-charging/): Combien de temps dure la recharge de votre voiture électrique et combien coûte-t-elle ? Durée de recharge, énergie du réseau et coût avec n’importe quelle borne, pertes et limites de la voiture comprises.
  - Addresses: en https://how.box/vehicles/ev-charging/, en-us https://how.box/en-us/vehicles/ev-charging/, fi https://how.box/fi/vehicles/ev-charging/, de https://how.box/de/vehicles/ev-charging/, es https://how.box/es/vehicles/ev-charging/, fr https://how.box/fr/vehicles/ev-charging/, sv https://how.box/sv/vehicles/ev-charging/, it https://how.box/it/vehicles/ev-charging/, et https://how.box/et/vehicles/ev-charging/
  - Link to an answer: https://how.box/fr/vehicles/ev-charging/?cap={cap}&from={from}&to={to}&type={type}&kw={kw}&ac={ac}&dc={dc}&loss={loss}&p={p}&c={c}&use={use}&du={du}&lead={lead} (cap: number 1 to 300; from: number 0 to 99; to: number 1 to 100; type: ac or dc; kw: number 0.5 to 400; ac: number 1 to 50; dc: number 5 to 500; loss: text; p: number 0 to 100; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL; use: text; du: km or mi; lead: cost or time), e.g. https://how.box/fr/vehicles/ev-charging/?cap=60&from=10&to=80&type=ac&kw=11&ac=11&dc=150&loss=10&p=0.25&c=EUR&use=17&du=km&lead=time. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, costs, energy.
  - Agent tools: `ev_charging_calculate` (Cost, time and energy of charging an electric car.)
  - Preset [Calculateur du coût de recharge électrique](https://how.box/fr/vehicles/ev-charging-cost/): Combien coûtera la recharge de votre voiture électrique ? The same tool, preconfigured.
  - Preset [Calculateur de durée de recharge électrique](https://how.box/fr/vehicles/ev-charging-time/): Combien de temps votre voiture électrique mettra-t-elle à se recharger ? The same tool, preconfigured.
- [Autonomie voiture électrique](https://how.box/fr/vehicles/ev-range/): Quelle distance votre voiture électrique peut-elle parcourir ? Estimez l’autonomie d’après la capacité de la batterie, la consommation et le niveau de charge, avec une option temps froid.
  - Addresses: en https://how.box/vehicles/ev-range/, en-us https://how.box/en-us/vehicles/ev-range/, fi https://how.box/fi/vehicles/ev-range/, de https://how.box/de/vehicles/ev-range/, es https://how.box/es/vehicles/ev-range/, fr https://how.box/fr/vehicles/ev-range/, sv https://how.box/sv/vehicles/ev-range/, it https://how.box/it/vehicles/ev-range/, et https://how.box/et/vehicles/ev-range/
  - Link to an answer: https://how.box/fr/vehicles/ev-range/?b={b}&u={u}&c={c}&cu={cu}&from={from}&to={to}&w={w} (b: number 1 to 500; u: number 1 to 100; c: number 0 to 10000; cu: kwh_100km, wh_km, wh_mi, km_kwh or mi_kwh; from: number 1 to 100; to: number 0 to 99; w: mild, cold or cold_heated), e.g. https://how.box/fr/vehicles/ev-range/?b=60&u=95&c=18&cu=kwh_100km&from=100&to=10&w=cold_heated. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, energy, distance.
  - Agent tools: `ev_range_calculate` (Estimates the range of an electric car.)
  - Preset [Autonomie électrique en hiver](https://how.box/fr/vehicles/ev-winter-range/): Quelle distance votre voiture électrique fera-t-elle en hiver ? The same tool, preconfigured.
- [Indemnisation des vols retardés](https://how.box/fr/aviation/flight-delay-compensation/): Quelle indemnisation pour votre vol retardé ? Vérifier EU 261 et UK 261 : de 250 à 600 € ou de 220 à 520 £ pour un vol retardé, annulé ou surbooké, avec le motif.
  - Addresses: en https://how.box/aviation/flight-delay-compensation/, en-us https://how.box/en-us/aviation/flight-delay-compensation/, fi https://how.box/fi/aviation/flight-delay-compensation/, de https://how.box/de/aviation/flight-delay-compensation/, es https://how.box/es/aviation/flight-delay-compensation/, fr https://how.box/fr/aviation/flight-delay-compensation/, sv https://how.box/sv/aviation/flight-delay-compensation/, it https://how.box/it/aviation/flight-delay-compensation/, et https://how.box/et/aviation/flight-delay-compensation/
  - Link to an answer: https://how.box/fr/aviation/flight-delay-compensation/?r={r}&from={from}&to={to}&km={km}&fz={fz}&tz={tz}&c={c}&d={d}&e={e}&h={h}&min={min}&n={n}&rr={rr}&eh={eh}&x={x} (r: airports or distance; from: text; to: text; km: number 1 to 20040; fz: eu, uk or other; tz: eu, uk or other; c: eu, uk or other; d: text; e: delay, cancellation or denied_boarding; h: whole number 0 to 240; min: whole number 0 to 59; n: whole number 0 to 365; rr: boolean; eh: number 0 to 48; x: boolean), e.g. https://how.box/fr/aviation/flight-delay-compensation/?r=airports&from=HEL&to=LHR&km=1845&fz=eu&tz=other&c=eu&d=2026-07-01&e=delay&h=3&min=20&n=5&rr=1&eh=1&x=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, flight, distance.
  - Agent tools: `flight_delay_compensation_calculate` (Fixed compensation a passenger may be owed under EU Regulation 261/2004 or UK Regulation 261 for a delayed or cancelled flight or denied boarding.)
- [Heure d’arrivée d’un vol](https://how.box/fr/everyday/flight-time/): À quelle heure locale mon vol va-t-il atterrir ? L’heure locale d’atterrissage d’après l’heure de départ et la durée du vol, malgré les fuseaux horaires, l’heure d’été et la ligne de changement de date.
  - Addresses: en https://how.box/everyday/flight-time/, en-us https://how.box/en-us/everyday/flight-time/, fi https://how.box/fi/everyday/flight-time/, de https://how.box/de/everyday/flight-time/, es https://how.box/es/everyday/flight-time/, fr https://how.box/fr/everyday/flight-time/, sv https://how.box/sv/everyday/flight-time/, it https://how.box/it/everyday/flight-time/, et https://how.box/et/everyday/flight-time/
  - Link to an answer: https://how.box/fr/everyday/flight-time/?m={m}&from={from}&day={day}&t={t}&h={h}&min={min}&to={to}&aday={aday}&at={at} (m: arrival or duration; from: text; day: text; t: text; h: whole number 0 to 99; min: whole number 0 to 59; to: text; aday: text; at: text), e.g. https://how.box/fr/everyday/flight-time/?m=arrival&from=Europe%2FHelsinki&day=2026-10-21&t=10%3A00&h=9&min=5&to=America%2FNew_York&aday=2026-10-21&at=12%3A05. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, flight.
  - Agent tools: `flight_time_calculate` (Local arrival time of a flight from its local departure time, time in the air and the two IANA time zones (daylight saving time and the date line from the browser's time-zone database); or, in duration mode, the time in the air from both local times as a timetable gives them.)
- [Convertisseur de force](https://how.box/fr/conversion/force/): Combien fait cette force dans d’autres unités ? Convertissez entre newtons, kilonewtons, kilogrammes-force, livres-force, kips, dynes et poundals.
  - Addresses: en https://how.box/conversion/force/, en-us https://how.box/en-us/conversion/force/, fi https://how.box/fi/conversion/force/, de https://how.box/de/conversion/force/, es https://how.box/es/conversion/force/, fr https://how.box/fr/conversion/force/, sv https://how.box/sv/conversion/force/, it https://how.box/it/conversion/force/, et https://how.box/et/conversion/force/
  - Link to an answer: https://how.box/fr/conversion/force/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: n, kn, dyn, kgf, lbf, ozf, kip or pdl; to: n, kn, dyn, kgf, lbf, ozf, kip or pdl), e.g. https://how.box/fr/conversion/force/?v=100&from=n&to=lbf. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, metric, imperial.
  - Agent tools: `force_convert` (Converts a force between units using exact definitions (1 kN = 1000 N, 1 dyn = 1e-5 N, 1 kgf = 9.80665 N, 1 lbf = 0.45359237 × 9.80665 N ≈ 4.448222 N, 1 ozf = lbf/16, 1 kip = 1000 lbf, 1 pdl = 0.45359237 × 0.3048 N; NIST SP 811 B.9).)
- [Calcul de fractions](https://how.box/fr/math/fraction/): Combien cela fait-il en fractions ? Additionner, soustraire, multiplier et diviser des fractions et des nombres mixtes, ou convertir un décimal en fraction, avec un résultat irréductible.
  - Addresses: en https://how.box/math/fraction/, en-us https://how.box/en-us/math/fraction/, fi https://how.box/fi/math/fraction/, de https://how.box/de/math/fraction/, es https://how.box/es/math/fraction/, fr https://how.box/fr/math/fraction/, sv https://how.box/sv/math/fraction/, it https://how.box/it/math/fraction/, et https://how.box/et/math/fraction/
  - Link to an answer: https://how.box/fr/math/fraction/?m={m}&a={a}&o={o}&b={b}&x={x} (m: operate or decimal; a: text; o: add, subtract, multiply or divide; b: text; x: text), e.g. https://how.box/fr/math/fraction/?m=operate&a=2%2F3&o=multiply&b=3%2F5&x=0.25. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `fraction_calculate` (Exact fraction arithmetic.)
- [Calcul du coût de carburant](https://how.box/fr/everyday/fuel-cost/): Combien coûtera le carburant de votre trajet ? Calculer le carburant nécessaire et le coût d’un trajet à partir de la distance, de la consommation et du prix du carburant.
  - Addresses: en https://how.box/everyday/fuel-cost/, en-us https://how.box/en-us/everyday/fuel-cost/, fi https://how.box/fi/everyday/fuel-cost/, de https://how.box/de/everyday/fuel-cost/, es https://how.box/es/everyday/fuel-cost/, fr https://how.box/fr/everyday/fuel-cost/, sv https://how.box/sv/everyday/fuel-cost/, it https://how.box/it/everyday/fuel-cost/, et https://how.box/et/everyday/fuel-cost/
  - Link to an answer: https://how.box/fr/everyday/fuel-cost/?d={d}&du={du}&f={f}&fu={fu}&p={p}&pu={pu}&c={c}&n={n} (d: number 0 to 100000; du: km or mi; f: number 0.1 to 1000; fu: l_per_100km, km_per_l, mpg_us or mpg_uk; p: number 0 to 10000; pu: l, us_gal or imp_gal; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL; n: whole number 1 to 100), e.g. https://how.box/fr/everyday/fuel-cost/?d=300&du=km&f=6.5&fu=l_per_100km&p=1.8&pu=l&c=EUR&n=1. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, costs, distance.
  - Agent tools: `fuel_cost_calculate` (Fuel needed and cost of a trip.)
- [Conversion de consommation](https://how.box/fr/conversion/fuel-economy/): Combien consomme votre voiture dans d’autres unités ? Convertir L/100 km, km/L, miles par gallon (américains et impériaux) et consommation électrique en kWh/100 km ou mi/kWh.
  - Addresses: en https://how.box/conversion/fuel-economy/, en-us https://how.box/en-us/conversion/fuel-economy/, fi https://how.box/fi/conversion/fuel-economy/, de https://how.box/de/conversion/fuel-economy/, es https://how.box/es/conversion/fuel-economy/, fr https://how.box/fr/conversion/fuel-economy/, sv https://how.box/sv/conversion/fuel-economy/, it https://how.box/it/conversion/fuel-economy/, et https://how.box/et/conversion/fuel-economy/
  - Link to an answer: https://how.box/fr/conversion/fuel-economy/?v={v}&from={from}&to={to} (v: number 0.01 to 1e6; from: l_100km, km_l, mpg_us, mpg_imp, kwh_100km, wh_km, wh_mi, km_kwh or mi_kwh; to: l_100km, km_l, mpg_us, mpg_imp, kwh_100km, wh_km, wh_mi, km_kwh or mi_kwh), e.g. https://how.box/fr/conversion/fuel-economy/?v=30&from=mpg_us&to=km_l. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, metric, imperial, energy.
  - Agent tools: `fuel_economy_calculate` (Converts fuel or electric consumption between units that count in opposite directions, using exact definitions (mile 1.609344 km, US gallon 3.785411784 L, imperial gallon 4.54609 L; NIST SP 811 B.8, UK Weights and Measures Act 1985).)
  - Preset [Miles par gallon en L/100 km](https://how.box/fr/conversion/mpg-to-l-100km/): Combien de litres aux 100 km pour votre valeur en mpg ? The same tool, preconfigured.
  - Preset [Consommation de voiture électrique](https://how.box/fr/conversion/ev-consumption/): Quelle est l’efficacité de votre voiture électrique ? The same tool, preconfigured.
- [Horloge plein écran](https://how.box/fr/datetime/fullscreen-clock/): Quelle heure est-il ? Une horloge facile à lire, sur votre bureau ou depuis l’autre bout de la pièce.
  - Addresses: en https://how.box/datetime/fullscreen-clock/, en-us https://how.box/en-us/datetime/fullscreen-clock/, fi https://how.box/fi/datetime/fullscreen-clock/, de https://how.box/de/datetime/fullscreen-clock/, es https://how.box/es/datetime/fullscreen-clock/, fr https://how.box/fr/datetime/fullscreen-clock/, sv https://how.box/sv/datetime/fullscreen-clock/, it https://how.box/it/datetime/fullscreen-clock/, et https://how.box/et/datetime/fullscreen-clock/
  - Link to an answer: https://how.box/fr/datetime/fullscreen-clock/?z={z}&f={f}&s={s}&d={d}&sec={sec}&h={h} (z: text; f: digital or analog; s: tick; d: minimal; sec: hide; h: h12 or h23), e.g. https://how.box/fr/datetime/fullscreen-clock/?z=Europe%2FHelsinki&f=analog&s=tick&d=minimal&sec=hide&h=h12. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference.
  - Agent tools: none
- [Calcul du PGCD et du PPCM](https://how.box/fr/math/gcd/): Quels diviseurs ces nombres ont-ils en commun ? Le plus grand commun diviseur et le plus petit commun multiple de deux à dix entiers, avec les étapes d’Euclide.
  - Addresses: en https://how.box/math/gcd/, en-us https://how.box/en-us/math/gcd/, fi https://how.box/fi/math/gcd/, de https://how.box/de/math/gcd/, es https://how.box/es/math/gcd/, fr https://how.box/fr/math/gcd/, sv https://how.box/sv/math/gcd/, it https://how.box/it/math/gcd/, et https://how.box/et/math/gcd/
  - Link to an answer: https://how.box/fr/math/gcd/?n={n}&s={s} (n: text; s: gcd or lcm), e.g. https://how.box/fr/math/gcd/?n=1071%2C462&s=lcm. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, reference.
  - Agent tools: `gcd_calculate` (Greatest common divisor (gcd, also called greatest common factor) and least common multiple (lcm) of 2 to 10 whole numbers of up to 40 digits each, exact.)
  - Preset [Calcul du PPCM](https://how.box/fr/math/lcm/): Quel est le plus petit commun multiple ? The same tool, preconfigured.
- [Calculateur de droits de donation](https://how.box/fr/finance/gift-tax/): Combien de droits de donation sont dus sur un don en Finlande ? Les droits de donation finlandais sur un don, en ajoutant les dons antérieurs du même donateur sur les trois dernières années.
  - Addresses: en https://how.box/finance/gift-tax/, en-us https://how.box/en-us/finance/gift-tax/, fi https://how.box/fi/finance/gift-tax/, de https://how.box/de/finance/gift-tax/, es https://how.box/es/finance/gift-tax/, fr https://how.box/fr/finance/gift-tax/, sv https://how.box/sv/finance/gift-tax/, it https://how.box/it/finance/gift-tax/, et https://how.box/et/finance/gift-tax/
  - Link to an answer: https://how.box/fr/finance/gift-tax/?v={v}&r={r}&e={e}&d={d} (v: number 0 to 1e10; r: close or other; e: number 0 to 1e10; d: text), e.g. https://how.box/fr/finance/gift-tax/?v=50000&r=other&e=50000&d=2026-03-01. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, tax. Countries: FI (Finlande).
  - Agent tools: `gift_tax_calculate` (Finland only: the gift tax (lahjavero) the receiver pays by Perintö- ja lahjaverolaki 378/1940 and the scale in force on the gift date (gifts from 2026: no tax under 7 500 €; class I 8–17 %, class II 19–33 %; 2017–2025: from 5 000 €).)
- [Papier quadrillé](https://how.box/fr/printables/graph-paper/): Comment imprimer du papier quadrillé à la bonne taille ? Un quadrillage adapté à votre papier.
  - Addresses: en https://how.box/printables/graph-paper/, en-us https://how.box/en-us/printables/graph-paper/, fi https://how.box/fi/printables/graph-paper/, de https://how.box/de/printables/graph-paper/, es https://how.box/es/printables/graph-paper/, fr https://how.box/fr/printables/graph-paper/, sv https://how.box/sv/printables/graph-paper/, it https://how.box/it/printables/graph-paper/, et https://how.box/et/printables/graph-paper/
  - Link to an answer: https://how.box/fr/printables/graph-paper/?p={p}&o={o}&s={s}&m={m} (p: a4 or letter; o: portrait or landscape; s: number 2 to 20; m: number 5 to 25), e.g. https://how.box/fr/printables/graph-paper/?p=a4&o=portrait&s=5&m=10. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, geometry, metric, imperial.
  - Agent tools: `graph_paper_describe` (Describe a square grid on A4 or Letter paper in portrait or landscape.)
- [Générateur d’empreintes](https://how.box/fr/web/hash/): Comment obtenir l’empreinte d’un texte ? Des empreintes SHA-256, SHA-512, SHA-1 et MD5 de tout texte, calculées dans votre navigateur.
  - Addresses: en https://how.box/web/hash/, en-us https://how.box/en-us/web/hash/, fi https://how.box/fi/web/hash/, de https://how.box/de/web/hash/, es https://how.box/es/web/hash/, fr https://how.box/fr/web/hash/, sv https://how.box/sv/web/hash/, it https://how.box/it/web/hash/, et https://how.box/et/web/hash/
  - Link to an answer: https://how.box/fr/web/hash/?alg={alg}&text={text}&enc={enc}&expect={expect} (alg: md5, sha-1, sha-256, sha-384 or sha-512; text: text; enc: hex or base64; expect: text), e.g. https://how.box/fr/web/hash/?alg=sha-256&text=Hello%2C+world%21&enc=hex&expect=. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, encoding.
  - Agent tools: `hash_compute` (Computes the hash (message digest) of a text: MD5 (RFC 1321, checksums only), SHA-1, SHA-256, SHA-384 or SHA-512 (FIPS 180-4), reading the text as UTF-8.)
- [Calculateur de zones cardiaques](https://how.box/fr/health/heart-rate/): À quelle vitesse votre cœur doit-il battre à l’entraînement ? Votre fréquence cardiaque maximale estimée et cinq zones d’entraînement selon votre âge et votre fréquence au repos, par la méthode de Karvonen (réserve cardiaque).
  - Addresses: en https://how.box/health/heart-rate/, en-us https://how.box/en-us/health/heart-rate/, fi https://how.box/fi/health/heart-rate/, de https://how.box/de/health/heart-rate/, es https://how.box/es/health/heart-rate/, fr https://how.box/fr/health/heart-rate/, sv https://how.box/sv/health/heart-rate/, it https://how.box/it/health/heart-rate/, et https://how.box/et/health/heart-rate/
  - Link to an answer: https://how.box/fr/health/heart-rate/?a={a}&r={r}&mt={mt}&max={max} (a: whole number 15 to 90; r: whole number 30 to 120; mt: tanaka, fox or measured; max: whole number 100 to 230), e.g. https://how.box/fr/health/heart-rate/?a=40&r=55&mt=fox&max=190. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, fitness.
  - Agent tools: `heart_rate_zones` (Maximum heart rate and five training zones by heart-rate reserve (Karvonen: target = rest + intensity × (max − rest)), zones of 50–60, 60–70, 70–80, 80–90 and 90–100 % of the reserve.)
- [Jours fériés en Finlande](https://how.box/fr/datetime/holidays/): Quand sont les prochains jours fériés en Finlande ? Les jours fériés et veilles de fête en Finlande pour chaque année, avec le jour de la semaine et le délai jusqu’au prochain.
  - Addresses: en https://how.box/datetime/holidays/, en-us https://how.box/en-us/datetime/holidays/, fi https://how.box/fi/datetime/holidays/, de https://how.box/de/datetime/holidays/, es https://how.box/es/datetime/holidays/, fr https://how.box/fr/datetime/holidays/, sv https://how.box/sv/datetime/holidays/, it https://how.box/it/datetime/holidays/, et https://how.box/et/datetime/holidays/
  - Link to an answer: https://how.box/fr/datetime/holidays/?y={y}&v={v} (y: whole number 1992 to 2100; v: all or flag_days), e.g. https://how.box/fr/datetime/holidays/?y=2027&v=flag_days. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, calculator. Countries: FI (Finlande).
  - Agent tools: `holidays_list` (Finnish public holidays for a year (default: the current year on the visitor's device), from 1992, in date order: each with its date (YYYY-MM-DD), id, kind (holiday, or eve for Midsummer Eve and Christmas Eve, which are customary days off) and ISO weekday (1 Monday to 7 Sunday).)
  - Preset [Jours du drapeau en Finlande](https://how.box/fr/datetime/flag-days/): Quand hisse-t-on le drapeau en Finlande ? The same tool, preconfigured.
- [Puissance borne de recharge](https://how.box/fr/vehicles/home-charger/): À quelle vitesse pouvez-vous recharger votre voiture chez vous ? Phases, ampères et volts : la puissance de charge et le temps pour ajouter l’énergie dont vous avez besoin.
  - Addresses: en https://how.box/vehicles/home-charger/, en-us https://how.box/en-us/vehicles/home-charger/, fi https://how.box/fi/vehicles/home-charger/, de https://how.box/de/vehicles/home-charger/, es https://how.box/es/vehicles/home-charger/, fr https://how.box/fr/vehicles/home-charger/, sv https://how.box/sv/vehicles/home-charger/, it https://how.box/it/vehicles/home-charger/, et https://how.box/et/vehicles/home-charger/
  - Link to an answer: https://how.box/fr/vehicles/home-charger/?ph={ph}&a={a}&v={v}&e={e}&ob={ob} (ph: 1 or 3; a: number 1 to 125; v: number 100 to 277; e: number 0.1 to 1000; ob: number 0 to 50), e.g. https://how.box/fr/vehicles/home-charger/?ph=3&a=16&v=230&e=40&ob=7.4. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, energy.
  - Agent tools: `home_charger_calculate` (Charging power of a home AC charging circuit and the time to add energy.)
  - Preset [Borne de recharge 11 kW](https://how.box/fr/vehicles/11-kw-charger/): Combien de temps une borne de 11 kW met-elle pour recharger votre voiture ? The same tool, preconfigured.
- [Codes de statut HTTP](https://how.box/fr/web/http-status/): Que signifie le statut HTTP 404 ? Retrouvez n’importe quel code de statut HTTP : ce que signifient 200, 301, 404, 429 ou 503, quand un serveur l’envoie, si les caches le gardent et quel RFC le définit.
  - Addresses: en https://how.box/web/http-status/, en-us https://how.box/en-us/web/http-status/, fi https://how.box/fi/web/http-status/, de https://how.box/de/web/http-status/, es https://how.box/es/web/http-status/, fr https://how.box/fr/web/http-status/, sv https://how.box/sv/web/http-status/, it https://how.box/it/web/http-status/, et https://how.box/et/web/http-status/
  - Link to an answer: https://how.box/fr/web/http-status/?q={q}&k={k}&c={c} (q: text; k: (empty), 1, 2, 3, 4 or 5; c: text), e.g. https://how.box/fr/web/http-status/?q=404&k=4&c=404. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, network.
  - Agent tools: `http_status_code` (Explains an HTTP status code (200 OK, 301, 404 Not Found, 429, 503…).); `http_status_list` (Lists the assigned HTTP status codes of a class, optionally narrowed by words or digits.)
- [Vérificateur d’IBAN](https://how.box/fr/finance/iban/): Cet IBAN est-il valide ? Vérifiez la clé de contrôle d’un IBAN et affichez-le au format papier, partie par partie.
  - Addresses: en https://how.box/finance/iban/, en-us https://how.box/en-us/finance/iban/, fi https://how.box/fi/finance/iban/, de https://how.box/de/finance/iban/, es https://how.box/es/finance/iban/, fr https://how.box/fr/finance/iban/, sv https://how.box/sv/finance/iban/, it https://how.box/it/finance/iban/, et https://how.box/et/finance/iban/
  - Link to an answer: https://how.box/fr/finance/iban/?iban={iban} (iban: text), e.g. https://how.box/fr/finance/iban/?iban=FI2112345600000785. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker, encoding.
  - Agent tools: `iban_check` (Check an IBAN: structure (2-letter country, 2 check digits, 11–30 letters/digits) and the ISO 7064 MOD 97-10 check digits.)
- [Compression d’image](https://how.box/fr/media/image-compress/): Jusqu’où réduire la taille de votre image ? Réduire le fichier d’une photo et voir le gain obtenu. Elle reste sur votre appareil.
  - Addresses: en https://how.box/media/image-compress/, en-us https://how.box/en-us/media/image-compress/, fi https://how.box/fi/media/image-compress/, de https://how.box/de/media/image-compress/, es https://how.box/es/media/image-compress/, fr https://how.box/fr/media/image-compress/, sv https://how.box/sv/media/image-compress/, it https://how.box/it/media/image-compress/, et https://how.box/et/media/image-compress/
  - Link to an answer: https://how.box/fr/media/image-compress/?mode={mode}&kb={kb}&q={q}&t={t}&max={max} (mode: quality or size; kb: number 1 to 100000; q: whole number 1 to 100; t: jpeg, webp or avif; max: whole number 0 to 16384), e.g. https://how.box/fr/media/image-compress/?mode=size&kb=100&q=80&t=jpeg&max=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter.
  - Agent tools: `image_compress_saving` (Works out how much a compressed image saved, from the file sizes in bytes.)
  - Preset [Compresser une image à 100 Ko](https://how.box/fr/media/compress-image-to-100kb/): Comment réduire une photo à moins de 100 Ko ? The same tool, preconfigured.
- [Conversion d’image](https://how.box/fr/media/image-convert/): Comment changer le format d’une image ? Convertir une image entre PNG, JPEG, WebP et AVIF. Elle reste sur votre appareil.
  - Addresses: en https://how.box/media/image-convert/, en-us https://how.box/en-us/media/image-convert/, fi https://how.box/fi/media/image-convert/, de https://how.box/de/media/image-convert/, es https://how.box/es/media/image-convert/, fr https://how.box/fr/media/image-convert/, sv https://how.box/sv/media/image-convert/, it https://how.box/it/media/image-convert/, et https://how.box/et/media/image-convert/
  - Link to an answer: https://how.box/fr/media/image-convert/?t={t}&q={q}&bg={bg} (t: png, jpeg, webp or avif; q: whole number 1 to 100; bg: white, black or gray), e.g. https://how.box/fr/media/image-convert/?t=webp&q=90&bg=white. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter.
  - Agent tools: `image_convert_file_name` (Tells what converting an image to a file type gives: the new file name, media type and whether the type keeps transparency and is lossy.)
- [Redimensionnement d’image](https://how.box/fr/media/image-resize/): Quelles dimensions donner à votre image ? Redimensionner une photo en largeur, en hauteur ou en pourcentage. Elle reste sur votre appareil.
  - Addresses: en https://how.box/media/image-resize/, en-us https://how.box/en-us/media/image-resize/, fi https://how.box/fi/media/image-resize/, de https://how.box/de/media/image-resize/, es https://how.box/es/media/image-resize/, fr https://how.box/fr/media/image-resize/, sv https://how.box/sv/media/image-resize/, it https://how.box/it/media/image-resize/, et https://how.box/et/media/image-resize/
  - Link to an answer: https://how.box/fr/media/image-resize/?m={m}&w={w}&h={h}&p={p}&max={max}&t={t} (m: width, height, percent, max or exact; w: whole number 1 to 16384; h: whole number 1 to 16384; p: number 1 to 1000; max: whole number 1 to 16384; t: same, png, jpeg, webp or avif), e.g. https://how.box/fr/media/image-resize/?m=width&w=800&h=600&p=50&max=1600&t=same. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter.
  - Agent tools: `image_resize_dimensions` (Calculates the size an image gets when resized, from the original width and height in pixels.)
- [Calculateur de droits de succession](https://how.box/fr/finance/inheritance-tax/): Combien de droits de succession paierez-vous en Finlande ? Les droits de succession finlandais sur votre part, selon la classe fiscale, les abattements et le barème à la date du décès.
  - Addresses: en https://how.box/finance/inheritance-tax/, en-us https://how.box/en-us/finance/inheritance-tax/, fi https://how.box/fi/finance/inheritance-tax/, de https://how.box/de/finance/inheritance-tax/, es https://how.box/es/finance/inheritance-tax/, fr https://how.box/fr/finance/inheritance-tax/, sv https://how.box/sv/finance/inheritance-tax/, it https://how.box/it/finance/inheritance-tax/, et https://how.box/et/finance/inheritance-tax/
  - Link to an answer: https://how.box/fr/finance/inheritance-tax/?s={s}&r={r}&d={d} (s: number 0 to 1e10; r: spouse, child_under_18, close or other; d: text), e.g. https://how.box/fr/finance/inheritance-tax/?s=45000&r=spouse&d=2026-01-02. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, tax. Countries: FI (Finlande).
  - Agent tools: `inheritance_tax_calculate` (Finland only: the inheritance tax (perintövero) on one heir's share by Perintö- ja lahjaverolaki 378/1940 and the scale in force on the date of death (deaths from 2026: no tax under 30 000 €; class I 100 € at 30 000 € rising to 19 % above 1 000 000 €, class II 19–33 %; 2017–2025: from 20 000 €).)
- [Minuteur d’intervalles](https://how.box/fr/datetime/interval-timer/): Combien dure votre entraînement, intervalle par intervalle ? Des intervalles d’effort et de repos, avec un grand affichage et un son à chaque changement.
  - Addresses: en https://how.box/datetime/interval-timer/, en-us https://how.box/en-us/datetime/interval-timer/, fi https://how.box/fi/datetime/interval-timer/, de https://how.box/de/datetime/interval-timer/, es https://how.box/es/datetime/interval-timer/, fr https://how.box/fr/datetime/interval-timer/, sv https://how.box/sv/datetime/interval-timer/, it https://how.box/it/datetime/interval-timer/, et https://how.box/et/datetime/interval-timer/
  - Link to an answer: https://how.box/fr/datetime/interval-timer/?wu={wu}&w={w}&r={r}&n={n}&s={s}&sr={sr}&cd={cd} (wu: whole number 0 to 1800; w: whole number 1 to 600; r: whole number 0 to 600; n: whole number 1 to 30; s: whole number 1 to 6; sr: whole number 0 to 900; cd: whole number 0 to 1800), e.g. https://how.box/fr/datetime/interval-timer/?wu=10&w=20&r=10&n=8&s=1&sr=60&cd=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: fitness, sound.
  - Agent tools: `interval_timer_plan` (The segments and total length of an interval workout (HIIT, Tabata, EMOM).)
- [Site inaccessible ?](https://how.box/fr/web/is-it-down/): Comment ce site web répond-il ? Vérifier la réponse d’un site web depuis notre serveur.
  - Addresses: en https://how.box/web/is-it-down/, en-us https://how.box/en-us/web/is-it-down/, fi https://how.box/fi/web/is-it-down/, de https://how.box/de/web/is-it-down/, es https://how.box/es/web/is-it-down/, fr https://how.box/fr/web/is-it-down/, sv https://how.box/sv/web/is-it-down/, it https://how.box/it/web/is-it-down/, et https://how.box/et/web/is-it-down/
  - Link to an answer: https://how.box/fr/web/is-it-down/?u={u} (u: text), e.g. https://how.box/fr/web/is-it-down/?u=https%3A%2F%2Fexample.com%2F. Served answer coverage: none (computed in the browser)
  - Uses our server; server limits: 20 requests/minute per visitor, 300 requests/day per visitor, 20 http/minute per visitor, 20 requests/minute per target, 20 requests/second per global. Tags: checker, network.
  - Agent tools: `is_it_down_check` (Checks a public website from our server only, not from all users.)
- [Formatage JSON](https://how.box/fr/web/json/): Comment formater et vérifier du JSON ? Coller du JSON pour repérer les erreurs, le mettre en forme ou le rendre compact.
  - Addresses: en https://how.box/web/json/, en-us https://how.box/en-us/web/json/, fi https://how.box/fi/web/json/, de https://how.box/de/web/json/, es https://how.box/es/web/json/, fr https://how.box/fr/web/json/, sv https://how.box/sv/web/json/, it https://how.box/it/web/json/, et https://how.box/et/web/json/
  - Link to an answer: https://how.box/fr/web/json/?mode={mode}&indent={indent}&sort={sort} (mode: pretty or minify; indent: 2, 4 or tab; sort: boolean), e.g. https://how.box/fr/web/json/?mode=pretty&indent=2&sort=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker, converter, encoding.
  - Agent tools: `json_format` (Validate and format JSON locally.)
- [Test du clavier](https://how.box/fr/media/keyboard-test/): Votre clavier fonctionne-t-il correctement ? Appuyer sur les touches pour voir leurs codes et suivre celles déjà testées.
  - Addresses: en https://how.box/media/keyboard-test/, en-us https://how.box/en-us/media/keyboard-test/, fi https://how.box/fi/media/keyboard-test/, de https://how.box/de/media/keyboard-test/, es https://how.box/es/media/keyboard-test/, fr https://how.box/fr/media/keyboard-test/, sv https://how.box/sv/media/keyboard-test/, it https://how.box/it/media/keyboard-test/, et https://how.box/et/media/keyboard-test/
  - Link to an answer: https://how.box/fr/media/keyboard-test/?layout={layout} (layout: ansi or iso), e.g. https://how.box/fr/media/keyboard-test/?layout=iso. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker.
  - Agent tools: none
- [Calculateur d’intérêts de retard](https://how.box/fr/finance/late-interest/): Combien d’intérêts de retard sont dus en Finlande ? Les intérêts de retard légaux sur une dette finlandaise impayée : le taux de référence plus 7 points, semestre par semestre.
  - Addresses: en https://how.box/finance/late-interest/, en-us https://how.box/en-us/finance/late-interest/, fi https://how.box/fi/finance/late-interest/, de https://how.box/de/finance/late-interest/, es https://how.box/es/finance/late-interest/, fr https://how.box/fr/finance/late-interest/, sv https://how.box/sv/finance/late-interest/, it https://how.box/it/finance/late-interest/, et https://how.box/et/finance/late-interest/
  - Link to an answer: https://how.box/fr/finance/late-interest/?a={a}&due={due}&paid={paid}&b2b={b2b} (a: number 0 to 1e9; due: text; paid: text; b2b: boolean), e.g. https://how.box/fr/finance/late-interest/?a=1000&due=2025-12-31&paid=2026-12-31&b2b=1. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, interest. Countries: FI (Finlande).
  - Agent tools: `late_interest_calculate` (Finland only: statutory late-payment interest (viivästyskorko, Korkolaki 633/1982) on an overdue amount, from the day after due_date through paid_date.)
- [Symboles d’entretien](https://how.box/fr/everyday/laundry-symbols/): Comment lire les symboles d’une étiquette d’entretien ? Chaque symbole d’entretien expliqué : cuve, triangle, carré, fer et cercle, avec les températures, points et barres en mots simples.
  - Addresses: en https://how.box/everyday/laundry-symbols/, en-us https://how.box/en-us/everyday/laundry-symbols/, fi https://how.box/fi/everyday/laundry-symbols/, de https://how.box/de/everyday/laundry-symbols/, es https://how.box/es/everyday/laundry-symbols/, fr https://how.box/fr/everyday/laundry-symbols/, sv https://how.box/sv/everyday/laundry-symbols/, it https://how.box/it/everyday/laundry-symbols/, et https://how.box/et/everyday/laundry-symbols/
  - Link to an answer: https://how.box/fr/everyday/laundry-symbols/?q={q}&g={g}&s={s} (q: text; g: (empty), wash, bleach, tumble, natural, iron or professional; s: text), e.g. https://how.box/fr/everyday/laundry-symbols/?q=iron&g=wash&s=wash-40. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, temperature.
  - Agent tools: `laundry_symbols_lookup` (Searches laundry care-label symbols by words (gentle wash, tumble dry, do not iron, dry clean), a temperature (40) or what they look like; best matches first.); `laundry_symbols_get` (Gets one care symbol by its id.)
- [Calculateur d’heure de départ](https://how.box/fr/everyday/leave-by/): À quelle heure partir pour arriver à l’heure ? L’heure limite de départ : votre heure d’arrivée moins le trajet, les arrêts en route et une marge de sécurité, même entre fuseaux horaires.
  - Addresses: en https://how.box/everyday/leave-by/, en-us https://how.box/en-us/everyday/leave-by/, fi https://how.box/fi/everyday/leave-by/, de https://how.box/de/everyday/leave-by/, es https://how.box/es/everyday/leave-by/, fr https://how.box/fr/everyday/leave-by/, sv https://how.box/sv/everyday/leave-by/, it https://how.box/it/everyday/leave-by/, et https://how.box/et/everyday/leave-by/
  - Link to an answer: https://how.box/fr/everyday/leave-by/?t={t}&day={day}&to={to}&h={h}&min={min}&b={b}&mg={mg}&from={from} (t: text; day: text; to: text; h: whole number 0 to 99; min: whole number 0 to 59; b: whole number 0 to 1440; mg: whole number 0 to 1440; from: text), e.g. https://how.box/fr/everyday/leave-by/?t=09%3A00&day=2026-10-22&to=Europe%2FHelsinki&h=2&min=30&b=20&mg=15&from=Europe%2FHelsinki. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, distance.
  - Agent tools: `leave_by_calculate` (The latest time to leave so as to arrive by a local time: leave = arrival − (travel + breaks + safety margin), with the starting place and the destination possibly in different IANA time zones (daylight saving time from the browser's time-zone database).)
- [Calculateur d’économies LED](https://how.box/fr/everyday/led-savings/): Combien économiserez-vous en passant aux ampoules LED ? Comparez une ancienne ampoule à une LED : l’énergie et l’argent économisés par an, et en combien de temps la LED est rentabilisée.
  - Addresses: en https://how.box/everyday/led-savings/, en-us https://how.box/en-us/everyday/led-savings/, fi https://how.box/fi/everyday/led-savings/, de https://how.box/de/everyday/led-savings/, es https://how.box/es/everyday/led-savings/, fr https://how.box/fr/everyday/led-savings/, sv https://how.box/sv/everyday/led-savings/, it https://how.box/it/everyday/led-savings/, et https://how.box/et/everyday/led-savings/
  - Link to an answer: https://how.box/fr/everyday/led-savings/?ow={ow}&lw={lw}&h={h}&p={p}&n={n}&lp={lp}&c={c} (ow: number 0 to 2000; lw: number 0 to 2000; h: number 0 to 24; p: number 0 to 100; n: whole number 1 to 1000; lp: number 0 to 100000; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL), e.g. https://how.box/fr/everyday/led-savings/?ow=60&lw=8&h=3&p=0.25&n=1&lp=5&c=EUR. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, costs, energy, savings.
  - Agent tools: `led_savings_calculate` (Energy and money saved a year by replacing old bulbs with LEDs, and the payback time.)
- [Conversion de longueurs](https://how.box/fr/conversion/length/): Quelle est cette longueur dans d’autres unités ? Convertir exactement les longueurs métriques et anglo-saxonnes.
  - Addresses: en https://how.box/conversion/length/, en-us https://how.box/en-us/conversion/length/, fi https://how.box/fi/conversion/length/, de https://how.box/de/conversion/length/, es https://how.box/es/conversion/length/, fr https://how.box/fr/conversion/length/, sv https://how.box/sv/conversion/length/, it https://how.box/it/conversion/length/, et https://how.box/et/conversion/length/
  - Link to an answer: https://how.box/fr/conversion/length/?v={v}&from={from}&to={to} (v: number -1e15 to 1e15; from: mm, cm, m, km, in, ft, yd, mi or nmi; to: mm, cm, m, km, in, ft, yd, mi or nmi), e.g. https://how.box/fr/conversion/length/?v=1&from=mi&to=km. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, length, distance, metric, imperial.
  - Agent tools: `length_convert` (Converts a length between units using exact definitions (1 in = 0.0254 m, 1 ft = 0.3048 m, 1 yd = 0.9144 m, 1 mi = 1609.344 m, 1 nmi = 1852 m).)
  - Preset [Miles en kilomètres](https://how.box/fr/conversion/miles-to-km/): Combien de kilomètres fait un mile ? The same tool, preconfigured.
  - Preset [Centimètres en pouces](https://how.box/fr/conversion/cm-to-inches/): Combien de pouces fait un centimètre ? The same tool, preconfigured.
  - Preset [Pouces en centimètres](https://how.box/fr/conversion/inches-to-cm/): Combien de centimètres fait un pouce ? The same tool, preconfigured.
  - Preset [Pieds en mètres](https://how.box/fr/conversion/feet-to-metres/): Combien de mètres fait un pied ? The same tool, preconfigured.
- [Calculateur de prêt](https://how.box/fr/finance/loan/): Combien votre prêt vous coûtera-t-il vraiment ? Échéances, intérêts et frais d’un prêt : échéances constantes ou amortissement constant, chaque mois ou moins souvent.
  - Addresses: en https://how.box/finance/loan/, en-us https://how.box/en-us/finance/loan/, fi https://how.box/fi/finance/loan/, de https://how.box/de/finance/loan/, es https://how.box/es/finance/loan/, fr https://how.box/fr/finance/loan/, sv https://how.box/sv/finance/loan/, it https://how.box/it/finance/loan/, et https://how.box/et/finance/loan/
  - Link to an answer: https://how.box/fr/finance/loan/?a={a}&r={r}&n={n}&i={i}&k={k}&f={f}&g={g}&c={c} (a: number 0 to 1e7; r: number 0 to 100; n: whole number 1 to 600; i: month, quarter, half_year or year; k: annuity or equal_principal; f: number 0 to 1e6; g: number 0 to 10000; c: text), e.g. https://how.box/fr/finance/loan/?a=10000&r=6&n=60&i=month&k=annuity&f=0&g=0&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Uses our server; server limits: 120 requests/minute per visitor. Tags: calculator, loans, interest, costs.
  - Agent tools: `loan_calculate` (Payment and total cost of a fixed-rate instalment loan (car, consumer, student or business loan), fees included.); `loan_schedule` (Amortization schedule of a fixed-rate instalment loan.)
- [Portes logiques](https://how.box/fr/electronics/logic-gates/): Comment fonctionnent les portes AND, OR, NOT et XOR ? Basculez les entrées et voyez aussitôt la sortie de chaque porte logique, avec son symbole dans les deux styles normalisés, son expression booléenne et sa table de vérité.
  - Addresses: en https://how.box/electronics/logic-gates/, en-us https://how.box/en-us/electronics/logic-gates/, fi https://how.box/fi/electronics/logic-gates/, de https://how.box/de/electronics/logic-gates/, es https://how.box/es/electronics/logic-gates/, fr https://how.box/fr/electronics/logic-gates/, sv https://how.box/sv/electronics/logic-gates/, it https://how.box/it/electronics/logic-gates/, et https://how.box/et/electronics/logic-gates/
  - Link to an answer: https://how.box/fr/electronics/logic-gates/?g={g}&n={n}&i={i}&s={s} (g: and, or, not, nand, nor, xor, xnor or buffer; n: whole number 2 to 8; i: text; s: distinctive or rectangular), e.g. https://how.box/fr/electronics/logic-gates/?g=nand&n=3&i=11100000&s=rectangular. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, encoding.
  - Agent tools: `logic_gates_evaluate` (Evaluates a logic gate (AND, OR, NOT, NAND, NOR, XOR, XNOR, BUFFER) for given inputs.); `logic_gates_truth_table` (Gives the truth table output column and the Boolean expression of a logic gate with 2 to 8 inputs.)
- [Vérification des dimensions de bagage](https://how.box/fr/everyday/luggage-size/): Votre bagage respecte-t-il les dimensions autorisées ? Comparer hauteur, largeur, profondeur et poids aux limites, avec le total L + l + H et un dessin, en centimètres ou en pouces.
  - Addresses: en https://how.box/everyday/luggage-size/, en-us https://how.box/en-us/everyday/luggage-size/, fi https://how.box/fi/everyday/luggage-size/, de https://how.box/de/everyday/luggage-size/, es https://how.box/es/everyday/luggage-size/, fr https://how.box/fr/everyday/luggage-size/, sv https://how.box/sv/everyday/luggage-size/, it https://how.box/it/everyday/luggage-size/, et https://how.box/et/everyday/luggage-size/
  - Link to an answer: https://how.box/fr/everyday/luggage-size/?h={h}&w={w}&d={d}&u={u}&kg={kg}&wu={wu}&a={a}&i={i}&mh={mh}&mw={mw}&md={md}&ms={ms}&mk={mk} (h: number 0 to 300; w: number 0 to 300; d: number 0 to 300; u: cm or in; kg: number 0 to 200; wu: kg or lb; a: own, ei, af, bt, aa, ba, dl, u2, ek, ay, ib, kl, lh, dy, qr, fr, sk, tk, ua, vy or w6; i: cabin or personal; mh: number 0 to 300; mw: number 0 to 300; md: number 0 to 300; ms: number 0 to 900; mk: number 0 to 200), e.g. https://how.box/fr/everyday/luggage-size/?h=55&w=40&d=20&u=cm&kg=7&wu=kg&a=ay&i=cabin&mh=55&mw=40&md=23&ms=158&mk=8. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, flight, length, weight, volume.
  - Agent tools: `luggage_size_check` (Checks whether a bag fits size and weight limits.); `luggage_size_airlines` (Lists the cabin baggage limits in the bundled table: the economy cabin bag and personal item of each listed airline as published on its own website (sides largest first in `unit`, cm or in; weight in kg or lb; null when not stated), whether the weight limit covers both items, whether the cheapest fare includes the cabin bag (null when the page does not say), and the source page with the date it was checked.)
  - Preset [Bagage cabine par compagnie](https://how.box/fr/everyday/cabin-baggage/): Votre bagage peut-il voyager en cabine ? The same tool, preconfigured.
- [Calculateur de macros](https://how.box/fr/health/macros/): Combien de grammes de protéines, lipides et glucides cela fait-il ? Transformez un objectif calorique quotidien et une répartition en pourcentage en grammes de protéines, de lipides et de glucides, par jour et par repas.
  - Addresses: en https://how.box/health/macros/, en-us https://how.box/en-us/health/macros/, fi https://how.box/fi/health/macros/, de https://how.box/de/health/macros/, es https://how.box/es/health/macros/, fr https://how.box/fr/health/macros/, sv https://how.box/sv/health/macros/, it https://how.box/it/health/macros/, et https://how.box/et/health/macros/
  - Link to an answer: https://how.box/fr/health/macros/?kcal={kcal}&p={p}&f={f}&m={m} (kcal: number 500 to 10000; p: number 0 to 100; f: number 0 to 100; m: whole number 1 to 8), e.g. https://how.box/fr/health/macros/?kcal=2500&p=30&f=30&m=4. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, energy, weight.
  - Agent tools: `macros_calculate` (Grams of protein, fat and carbohydrate a day that supply a daily energy target in a chosen split.)
- [Calculateur de marge](https://how.box/fr/finance/margin/): Quelle marge faites-vous sur une vente ? Obtenez le taux de marque, le taux de marge et le bénéfice à partir du coût et du prix de vente.
  - Addresses: en https://how.box/finance/margin/, en-us https://how.box/en-us/finance/margin/, fi https://how.box/fi/finance/margin/, de https://how.box/de/finance/margin/, es https://how.box/es/finance/margin/, fr https://how.box/fr/finance/margin/, sv https://how.box/sv/finance/margin/, it https://how.box/it/finance/margin/, et https://how.box/et/finance/margin/
  - Link to an answer: https://how.box/fr/finance/margin/?c={c}&p={p}&v={v}&m={m}&t={t} (c: number 0.01 to 1e9; p: number 0.01 to 1e9; v: number 0 to 100; m: margin or price; t: number 0 to 100), e.g. https://how.box/fr/finance/margin/?c=60&p=100&v=0&m=price&t=40. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, costs, tax.
  - Agent tools: `margin_calculate` (Profit margin and markup of one unit from its cost (excluding VAT) and selling price (including vat_percent VAT; 0 when the price is net), both in the same currency.)
  - Preset [Calculateur de taux de marge](https://how.box/fr/finance/markup/): Quel est votre taux de marge sur le coût ? The same tool, preconfigured.
- [Exercices de calcul](https://how.box/fr/kids/math-drills/): Comment vous débrouillez-vous en calcul ? Vous entraîner à votre rythme ou imprimer une fiche à résoudre sur papier.
  - Addresses: en https://how.box/kids/math-drills/, en-us https://how.box/en-us/kids/math-drills/, fi https://how.box/fi/kids/math-drills/, de https://how.box/de/kids/math-drills/, es https://how.box/es/kids/math-drills/, fr https://how.box/fr/kids/math-drills/, sv https://how.box/sv/kids/math-drills/, it https://how.box/it/kids/math-drills/, et https://how.box/et/kids/math-drills/
  - Link to an answer: https://how.box/fr/kids/math-drills/?ops={ops}&max={max}&n={n}&time={time}&seed={seed} (ops: text; max: whole number 1 to 20; n: whole number 1 to 40; time: whole number 0 to 600; seed: whole number 1 to 999999), e.g. https://how.box/fr/kids/math-drills/?ops=add%2Csubtract&max=10&n=20&time=60&seed=1. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: practice.
  - Agent tools: `math_drills_sheet` (Prepare a reproducible arithmetic worksheet and its answer key.)
- [Planificateur de réunion](https://how.box/fr/datetime/meeting-planner/): Comment trouver une heure de réunion qui convient à tous les fuseaux ? Choisir deux à six lieux et une date pour comparer les heures, les horaires de travail et le meilleur créneau pour tous.
  - Addresses: en https://how.box/datetime/meeting-planner/, en-us https://how.box/en-us/datetime/meeting-planner/, fi https://how.box/fi/datetime/meeting-planner/, de https://how.box/de/datetime/meeting-planner/, es https://how.box/es/datetime/meeting-planner/, fr https://how.box/fr/datetime/meeting-planner/, sv https://how.box/sv/datetime/meeting-planner/, it https://how.box/it/datetime/meeting-planner/, et https://how.box/et/datetime/meeting-planner/
  - Link to an answer: https://how.box/fr/datetime/meeting-planner/?z={z}&day={day}&from={from}&to={to}&h={h} (z: text; day: text; from: whole number 0 to 23; to: whole number 1 to 24; h: whole number 0 to 23), e.g. https://how.box/fr/datetime/meeting-planner/?z=Europe%2FHelsinki%2CAmerica%2FNew_York%2CAsia%2FTokyo&day=2026-10-16&from=9&to=17&h=14. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, reference.
  - Agent tools: `meeting_planner_slots` (Find a one-hour meeting time across 2 to 6 IANA time zones on one day, with daylight saving time for that date from the browser's time-zone database.)
- [Décodeur METAR et TAF](https://how.box/fr/aviation/metar/): Comment lire un METAR ou un TAF ? Coller un bulletin météo aéronautique pour décoder chaque groupe, avec catégorie de vol, humidité et altitude-densité.
  - Addresses: en https://how.box/aviation/metar/, en-us https://how.box/en-us/aviation/metar/, fi https://how.box/fi/aviation/metar/, de https://how.box/de/aviation/metar/, es https://how.box/es/aviation/metar/, fr https://how.box/fr/aviation/metar/, sv https://how.box/sv/aviation/metar/, it https://how.box/it/aviation/metar/, et https://how.box/et/aviation/metar/
  - Link to an answer: https://how.box/fr/aviation/metar/?r={r} (r: text), e.g. https://how.box/fr/aviation/metar/?r=EFHK+131050Z+22012KT+9999+FEW020+12%2F07+Q1013. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, weather, flight, encoding.
  - Agent tools: `metar_decode` (Decodes one METAR, SPECI or TAF aviation weather report (WMO FM 15/16/51, ICAO Annex 3, US practice per FAA AC 00-45H) into structured JSON: type, station (ICAO), station_name and station_elevation_ft (OurAirports; null when unknown or the airport data could not load), issue time (day of month and UTC), validity, wind (direction degrees true or null if variable, speed and gust in the reported unit kt/ms/kmh), visibility in metres (and statute miles when reported), runway visual range, present weather (WMO 4678 codes), cloud layers (base in ft above the aerodrome, CB/TCU), temperature and dew point (°C), QNH (hPa; inHg for US A-groups), relative humidity (%), pressure and density altitude at the station (ft; null without its elevation), the US flight category (VFR/MVFR/IFR/LIFR from ceiling and visibility), each trend or TAF change period (BECMG, TEMPO, FM, PROB30/40) with its conditions, remarks as written, and any unrecognised groups.)
- [Métronome : une pulsation régulière pour jouer](https://how.box/fr/music/metronome/): Comment garder une pulsation régulière ? Régler le tempo, écouter la pulsation et suivre le balancier.
  - Addresses: en https://how.box/music/metronome/, en-us https://how.box/en-us/music/metronome/, fi https://how.box/fi/music/metronome/, de https://how.box/de/music/metronome/, es https://how.box/es/music/metronome/, fr https://how.box/fr/music/metronome/, sv https://how.box/sv/music/metronome/, it https://how.box/it/music/metronome/, et https://how.box/et/music/metronome/
  - Link to an answer: https://how.box/fr/music/metronome/?bpm={bpm}&sig={sig}&sub={sub}&accent={accent}&sound={sound} (bpm: whole number 20 to 300; sig: 1-2, 2-2, 3-2, 4-2, 5-2, 6-2, 7-2, 8-2, 9-2, 10-2, 11-2, 12-2, 1-4, 2-4, 3-4, 4-4, 5-4, 6-4, 7-4, 8-4, 9-4, 10-4, 11-4, 12-4, 1-8, 2-8, 3-8, 4-8, 5-8, 6-8, 7-8, 8-8, 9-8, 10-8, 11-8 or 12-8; sub: 1, 2, 3 or 4; accent: boolean; sound: click, woodblock or beep), e.g. https://how.box/fr/music/metronome/?bpm=120&sig=6-8&sub=2&accent=1&sound=click. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: sound.
  - Agent tools: `metronome_set` (Set metronome settings without starting sound.); `metronome_tempo_name` (Look up an approximate Italian tempo name for integer 20–300 BPM; display that tempo without starting sound.)
- [Test du microphone](https://how.box/fr/media/mic-test/): Votre microphone fonctionne-t-il ? Appuyer sur Démarrer et parler : la jauge montre ce que capte votre microphone.
  - Addresses: en https://how.box/media/mic-test/, en-us https://how.box/en-us/media/mic-test/, fi https://how.box/fi/media/mic-test/, de https://how.box/de/media/mic-test/, es https://how.box/es/media/mic-test/, fr https://how.box/fr/media/mic-test/, sv https://how.box/sv/media/mic-test/, it https://how.box/it/media/mic-test/, et https://how.box/et/media/mic-test/
  - Link to an answer: https://how.box/fr/media/mic-test/?p={p} (p: raw or voice), e.g. https://how.box/fr/media/mic-test/?p=voice. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker, sound.
  - Agent tools: `mic_test_describe_level` (Says what a microphone test concludes from readings: whether the microphone is working, too quiet, too loud or clipping.)
- [Calculateur d’indemnités kilométriques](https://how.box/fr/finance/mileage/): Combien d’indemnités kilométriques non imposables pouvez-vous recevoir en Finlande ? L’indemnité kilométrique et l’indemnité journalière non imposables d’un déplacement professionnel en Finlande, aux barèmes de l’administration fiscale.
  - Addresses: en https://how.box/finance/mileage/, en-us https://how.box/en-us/finance/mileage/, fi https://how.box/fi/finance/mileage/, de https://how.box/de/finance/mileage/, es https://how.box/es/finance/mileage/, fr https://how.box/fr/finance/mileage/, sv https://how.box/sv/finance/mileage/, it https://how.box/it/finance/mileage/, et https://how.box/et/finance/mileage/
  - Link to an answer: https://how.box/fr/finance/mileage/?km={km}&v={v}&s={s}&p={p}&h={h}&m={m} (km: number 0 to 100000; v: car, motorboat_small, motorboat_large, snowmobile, atv, motorcycle, moped or other; s: text; p: whole number 0 to 8; h: number 0 to 1440; m: boolean), e.g. https://how.box/fr/finance/mileage/?km=250&v=car&s=trailer%2Cdog&p=1&h=11&m=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, tax, distance. Countries: FI (Finlande).
  - Agent tools: `mileage_calculate` (Finland only: the tax-free kilometre allowance (kilometrikorvaus) and domestic per diem (päiväraha) an employer may pay under the Tax Administration's yearly decision (2026: car 55 c/km, + 4 c/km per passenger, car supplements such as trailer 9 c and dog 4 c; per diem over 6 h 25 €, over 10 h 54 €, halved with free meals).)
- [Recherche d’adresse Mode S](https://how.box/fr/aviation/mode-s/): De quel pays vient l’adresse du transpondeur d’un aéronef ? Saisir une adresse Mode S ou ADS-B sur 24 bits, en hexadécimal, octal ou binaire, pour trouver le pays de son bloc.
  - Addresses: en https://how.box/aviation/mode-s/, en-us https://how.box/en-us/aviation/mode-s/, fi https://how.box/fi/aviation/mode-s/, de https://how.box/de/aviation/mode-s/, es https://how.box/es/aviation/mode-s/, fr https://how.box/fr/aviation/mode-s/, sv https://how.box/sv/aviation/mode-s/, it https://how.box/it/aviation/mode-s/, et https://how.box/et/aviation/mode-s/
  - Link to an answer: https://how.box/fr/aviation/mode-s/?a={a}&b={b} (a: text; b: hex, octal or binary), e.g. https://how.box/fr/aviation/mode-s/?a=4CA8E5&b=hex. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: reference, flight, converter.
  - Agent tools: `mode_s_lookup` (Which allocation block an ICAO 24-bit aircraft address (Mode S / ADS-B "hex code") falls in, per ICAO Annex 10 Vol.)
- [Phase de la Lune](https://how.box/fr/datetime/moon-phase/): Quelle est la phase de la Lune ? La phase de la Lune maintenant ou à une date donnée, sa part éclairée et les prochaines nouvelle et pleine lunes.
  - Addresses: en https://how.box/datetime/moon-phase/, en-us https://how.box/en-us/datetime/moon-phase/, fi https://how.box/fi/datetime/moon-phase/, de https://how.box/de/datetime/moon-phase/, es https://how.box/es/datetime/moon-phase/, fr https://how.box/fr/datetime/moon-phase/, sv https://how.box/sv/datetime/moon-phase/, it https://how.box/it/datetime/moon-phase/, et https://how.box/et/datetime/moon-phase/
  - Link to an answer: https://how.box/fr/datetime/moon-phase/?d={d}&lat={lat}&lon={lon}&z={z} (d: text; lat: text; lon: text; z: text), e.g. https://how.box/fr/datetime/moon-phase/?d=2026-10-26&lat=60.17&lon=24.94&z=Europe%2FHelsinki. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, reference.
  - Agent tools: `moon_phase_get` (The Moon's phase for a date (the Moon at 12:00 UTC that day) or right now: the name of the phase, the lit fraction of the disc, the age and the next new and full moon (Meeus, Astronomical Algorithms ch.)
- [Traducteur de code Morse](https://how.box/fr/text/morse/): Comment écrire, écouter et décoder du Morse ? Convertir texte et Morse, le jouer en son ou lumière, le décoder au micro ou à la caméra, ou le transmettre à la main.
  - Addresses: en https://how.box/text/morse/, en-us https://how.box/en-us/text/morse/, fi https://how.box/fi/text/morse/, de https://how.box/de/text/morse/, es https://how.box/es/text/morse/, fr https://how.box/fr/text/morse/, sv https://how.box/sv/text/morse/, it https://how.box/it/text/morse/, et https://how.box/et/text/morse/
  - Link to an answer: https://how.box/fr/text/morse/?d={d}&m={m}&wpm={wpm}&f={f}&ewpm={ewpm}&v={v}&hz={hz} (d: encode, decode or key; m: text; wpm: number 5 to 60; f: boolean; ewpm: number 2 to 60; v: tape or tree; hz: whole number 300 to 1200), e.g. https://how.box/fr/text/morse/?d=decode&m=...+---+...&wpm=20&f=1&ewpm=10&v=tree&hz=600. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, sound, encoding.
  - Agent tools: `morse_encode` (Encode text as International Morse code (ITU-R M.1677-1) and time it.); `morse_decode` (Decode written Morse code into text.)
- [Entraînement au Morse](https://how.box/fr/text/morse-trainer/): Comment apprendre à reconnaître le Morse à l’oreille ? Apprendre le Morse par la méthode Koch : écouter des groupes aléatoires à pleine vitesse, les saisir et ajouter un caractère à 90 % de réussite.
  - Addresses: en https://how.box/text/morse-trainer/, en-us https://how.box/en-us/text/morse-trainer/, fi https://how.box/fi/text/morse-trainer/, de https://how.box/de/text/morse-trainer/, es https://how.box/es/text/morse-trainer/, fr https://how.box/fr/text/morse-trainer/, sv https://how.box/sv/text/morse-trainer/, it https://how.box/it/text/morse-trainer/, et https://how.box/et/text/morse-trainer/
  - Link to an answer: https://how.box/fr/text/morse-trainer/?l={l}&wpm={wpm}&ewpm={ewpm} (l: whole number 1 to 40; wpm: whole number 5 to 40; ewpm: whole number 2 to 40), e.g. https://how.box/fr/text/morse-trainer/?l=5&wpm=20&ewpm=10. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: practice, sound, encoding.
  - Agent tools: `morse_trainer_lesson` (Describe a Koch-method Morse lesson (LCWO character order, ITU-R M.1677-1 signals): the characters learned so far, the newest one, each signal in dots and dashes, the accuracy (90 %) and number of characters needed to advance, and the timing in ms at the character speed wpm with Farnsworth spacing for effective_wpm.); `morse_trainer_score` (Score what a learner typed against the characters that were sent, position by position (spaces ignored, case folded, a missing character is wrong).)
- [Simulateur de prêt immobilier](https://how.box/fr/finance/mortgage/): Combien votre prêt immobilier vous coûtera-t-il vraiment par mois ? Voir votre mensualité, les intérêts totaux et la baisse du capital restant dû.
  - Addresses: en https://how.box/finance/mortgage/, en-us https://how.box/en-us/finance/mortgage/, fi https://how.box/fi/finance/mortgage/, de https://how.box/de/finance/mortgage/, es https://how.box/es/finance/mortgage/, fr https://how.box/fr/finance/mortgage/, sv https://how.box/sv/finance/mortgage/, it https://how.box/it/finance/mortgage/, et https://how.box/et/finance/mortgage/
  - Link to an answer: https://how.box/fr/finance/mortgage/?p={p}&r={r}&y={y}&c={c} (p: number 0 to 1e8; r: number 0 to 50; y: whole number 1 to 50; c: text), e.g. https://how.box/fr/finance/mortgage/?p=200000&r=5&y=30&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Uses our server; server limits: 120 requests/minute per visitor. Tags: calculator, loans, interest, housing.
  - Agent tools: `mortgage_calculate_payment` (Calculates the fixed monthly payment of an annuity (level-payment) loan with monthly compounding.); `mortgage_amortization_schedule` (Amortization schedule of a fixed-rate annuity loan with monthly compounding and monthly payments.)
- [Infos du navigateur](https://how.box/fr/web/my-browser/): Comment votre navigateur s’identifie-t-il ? Données déclarées du navigateur, du moteur et de l’appareil.
  - Addresses: en https://how.box/web/my-browser/, en-us https://how.box/en-us/web/my-browser/, fi https://how.box/fi/web/my-browser/, de https://how.box/de/web/my-browser/, es https://how.box/es/web/my-browser/, fr https://how.box/fr/web/my-browser/, sv https://how.box/sv/web/my-browser/, it https://how.box/it/web/my-browser/, et https://how.box/et/web/my-browser/
  - Link to an answer: https://how.box/fr/web/my-browser/?facet={facet} (facet: identity, update, agent, display, chrome or tesla), e.g. https://how.box/fr/web/my-browser/?facet=chrome. Served answer coverage: none (computed in the browser)
  - Uses our server; server limits: 60 requests/minute per visitor. Tags: checker.
  - Agent tools: `my_browser_latest_versions` (Returns public vendor browser release feeds, with product, platform, architecture where available, version, channel, fetch timestamp and cache age in seconds.)
  - Preset [Mise à jour du navigateur](https://how.box/fr/web/is-my-browser-up-to-date/): Mon navigateur est-il à jour ? The same tool, preconfigured.
  - Preset [Identification du navigateur](https://how.box/fr/web/what-browser-am-i-using/): Quel navigateur est-ce que j’utilise ? The same tool, preconfigured.
  - Preset [Mon agent utilisateur](https://how.box/fr/web/my-user-agent/): Quelle est ma chaîne d’agent utilisateur ? The same tool, preconfigured.
  - Preset [Ma résolution d’écran](https://how.box/fr/web/my-screen-resolution/): Quelle est ma résolution d’écran ? The same tool, preconfigured.
  - Preset [Version de Chrome](https://how.box/fr/web/chrome-version/): Quelle version de Chrome ai-je ? The same tool, preconfigured.
  - Preset [Navigateur Tesla](https://how.box/fr/web/tesla-browser/): Quelle version de Chrome utilise le navigateur de ma Tesla ? The same tool, preconfigured.
- [Calculateur de salaire net](https://how.box/fr/finance/net-salary/): Combien vous reste-t-il de votre salaire ? Du brut au net en Allemagne, en Estonie ou en Finlande, avec chaque impôt et chaque cotisation.
  - Addresses: en https://how.box/finance/net-salary/, en-us https://how.box/en-us/finance/net-salary/, fi https://how.box/fi/finance/net-salary/, de https://how.box/de/finance/net-salary/, es https://how.box/es/finance/net-salary/, fr https://how.box/fr/finance/net-salary/, sv https://how.box/sv/finance/net-salary/, it https://how.box/it/finance/net-salary/, et https://how.box/et/finance/net-salary/
  - Link to an answer: https://how.box/fr/finance/net-salary/?c={c}&g={g}&p={p}&n={n}&by={by}&mun={mun}&fc={fc}&tc={tc}&st={st}&kst={kst}&kfb={kfb}&k25={k25}&hc={hc}&zb={zb}&pen={pen} (c: DE, EE or FI; g: number 0 to 1e7; p: month or year; n: number; by: whole number 1920 to 2020; mun: text; fc: none, lutheran or orthodox; tc: number; st: BW, BY, BE, BB, HB, HH, HE, MV, NI, NW, RP, SL, SN, ST, SH or TH; kst: boolean; kfb: number 0 to 9.5; k25: whole number 0 to 20; hc: boolean; zb: number 0 to 10; pen: number), e.g. https://how.box/fr/finance/net-salary/?c=FI&g=3500&p=month&n=13&by=1990&mun=Helsinki&fc=lutheran&tc=3&st=BY&kst=1&kfb=1&k25=2&hc=1&zb=2.5&pen=4. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, salary, tax. Countries: DE (Allemagne), EE (Estonie), FI (Finlande).
  - Agent tools: `net_salary_calculate` (Net (take-home) pay from gross salary in Germany (DE: wage tax by the BMF PAP, solidarity surcharge, church tax, pension, unemployment, health and care insurance), Estonia (EE: income tax 22 % after the tax-free allowance, unemployment insurance 1.6 %, II pillar funded pension) or Finland (FI: state, municipal and church tax, medical care contribution, earned income credit, Yle tax, TyEL pension, unemployment and daily allowance contributions) under the current year's rules.)
  - Preset [Calculateur Brutto-Netto](https://how.box/fr/finance/brutto-netto-rechner/): Combien reste-t-il de votre salaire brut en Allemagne ? The same tool, preconfigured.
  - Preset [Calculateur de salaire pour l’Estonie](https://how.box/fr/finance/palgakalkulaator/): Combien de net reste-t-il d’un salaire brut en Estonie ? The same tool, preconfigured.
  - Preset [Calculateur de salaire net pour la Finlande](https://how.box/fr/finance/nettopalkka/): Combien de net reste-t-il d’un salaire brut en Finlande ? The same tool, preconfigured.
- [Fréquence d’une note](https://how.box/fr/music/note-frequency/): Quelle est la fréquence d’une note de musique ? Convertir une note en hertz ou une fréquence en note proche, avec cents, numéro MIDI, tableau d’octave et écoute.
  - Addresses: en https://how.box/music/note-frequency/, en-us https://how.box/en-us/music/note-frequency/, fi https://how.box/fi/music/note-frequency/, de https://how.box/de/music/note-frequency/, es https://how.box/es/music/note-frequency/, fr https://how.box/fr/music/note-frequency/, sv https://how.box/sv/music/note-frequency/, it https://how.box/it/music/note-frequency/, et https://how.box/et/music/note-frequency/
  - Link to an answer: https://how.box/fr/music/note-frequency/?m={m}&n={n}&f={f}&a={a}&t={t}&x={x}&y={y} (m: note or frequency; n: whole number 0 to 127; f: number 8 to 12544; a: number 400 to 480; t: octave or names; x: number 8 to 12544; y: number 8 to 12544), e.g. https://how.box/fr/music/note-frequency/?m=frequency&n=60&f=261.63&a=442&t=names&x=440&y=660. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, sound, frequency.
  - Agent tools: `note_frequency_note_to_frequency` (Converts a musical note to its frequency.); `note_frequency_frequency_to_note` (Finds the equal-tempered note nearest to a frequency and how far off it is in cents (positive = sharp).); `note_frequency_interval` (The musical interval between two frequencies.)
  - Preset [Noms des notes](https://how.box/fr/music/note-names/): Comment s’appellent les notes dans d’autres langues ? The same tool, preconfigured.
- [Calculateur de VAN et TRI](https://how.box/fr/finance/npv/): Combien vaut un investissement aujourd’hui ? Actualisez une liste de flux de trésorerie annuels en argent d’aujourd’hui et trouvez le taux auquel l’investissement atteint l’équilibre.
  - Addresses: en https://how.box/finance/npv/, en-us https://how.box/en-us/finance/npv/, fi https://how.box/fi/finance/npv/, de https://how.box/de/finance/npv/, es https://how.box/es/finance/npv/, fr https://how.box/fr/finance/npv/, sv https://how.box/sv/finance/npv/, it https://how.box/it/finance/npv/, et https://how.box/et/finance/npv/
  - Link to an answer: https://how.box/fr/finance/npv/?r={r}&f={f}&n={n}&c={c} (r: number -99 to 100; f: array; n: boolean; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL), e.g. https://how.box/fr/finance/npv/?r=8&f=%7E1%3Af1.-40000_f2.8000_f3.9200_f4.10000_f5.12000_f6.14500&n=1&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, savings, interest.
  - Agent tools: `npv_calculate` (Net present value and internal rate of return of a list of cash flows, one per equal period (year).)
- [Conversion de bases numériques](https://how.box/fr/math/number-base/): Comment convertir un nombre d’une base à une autre ? Convertir des entiers entre binaire, octal, décimal, hexadécimal et toute base jusqu’à 36.
  - Addresses: en https://how.box/math/number-base/, en-us https://how.box/en-us/math/number-base/, fi https://how.box/fi/math/number-base/, de https://how.box/de/math/number-base/, es https://how.box/es/math/number-base/, fr https://how.box/fr/math/number-base/, sv https://how.box/sv/math/number-base/, it https://how.box/it/math/number-base/, et https://how.box/et/math/number-base/
  - Link to an answer: https://how.box/fr/math/number-base/?v={v}&from={from}&to={to}&upper={upper} (v: text; from: whole number 2 to 36; to: whole number 2 to 36; upper: boolean), e.g. https://how.box/fr/math/number-base/?v=255&from=10&to=16&upper=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, calculator.
  - Agent tools: `number_base_convert` (Converts a whole number of any size between bases 2 and 36 (binary, octal, decimal, hexadecimal and the rest).)
  - Preset [Hexadécimal en décimal](https://how.box/fr/math/hex-to-decimal/): Que vaut un nombre hexadécimal en décimal ? The same tool, preconfigured.
- [Calculateur de loi d’Ohm](https://how.box/fr/physics/ohms-law/): Quel courant circule, et quelle puissance est consommée ? Indiquez deux grandeurs parmi la tension, le courant, la résistance et la puissance pour obtenir les deux autres.
  - Addresses: en https://how.box/physics/ohms-law/, en-us https://how.box/en-us/physics/ohms-law/, fi https://how.box/fi/physics/ohms-law/, de https://how.box/de/physics/ohms-law/, es https://how.box/es/physics/ohms-law/, fr https://how.box/fr/physics/ohms-law/, sv https://how.box/sv/physics/ohms-law/, it https://how.box/it/physics/ohms-law/, et https://how.box/et/physics/ohms-law/
  - Link to an answer: https://how.box/fr/physics/ohms-law/?k={k}&v={v}&i={i}&r={r}&p={p}&vu={vu}&iu={iu}&ru={ru}&pu={pu} (k: voltage_resistance, voltage_current, current_resistance, voltage_power, current_power or resistance_power; v: number 0.000001 to 1e6; i: number 1e-9 to 100000; r: number 0.000001 to 1e12; p: number 1e-9 to 1e9; vu: mv or v; iu: ma or a; ru: milliohm, ohm, kohm or megohm; pu: mw, w or kw), e.g. https://how.box/fr/physics/ohms-law/?k=voltage_resistance&v=12&i=0.02&r=470&p=0.25&vu=v&iu=ma&ru=kohm&pu=w. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `ohms_law_calculate` (Ohm's law and power for a resistive DC load: V = I·R and P = V·I = I²·R = V²/R.)
- [Conversion d’anciennes monnaies](https://how.box/fr/finance/old-currency/): Combien valent les anciennes monnaies en euros aujourd’hui ? Markka, mark allemand, franc, lire et autres anciennes monnaies de l’euro à leur taux fixe ; aussi le markka en monnaie d’aujourd’hui.
  - Addresses: en https://how.box/finance/old-currency/, en-us https://how.box/en-us/finance/old-currency/, fi https://how.box/fi/finance/old-currency/, de https://how.box/de/finance/old-currency/, es https://how.box/es/finance/old-currency/, fr https://how.box/fr/finance/old-currency/, sv https://how.box/sv/finance/old-currency/, it https://how.box/it/finance/old-currency/, et https://how.box/et/finance/old-currency/
  - Link to an answer: https://how.box/fr/finance/old-currency/?d={d}&c={c}&a={a}&y={y} (d: to_euro or from_euro; c: ATS, BEF, BGN, CYP, DEM, EEK, ESP, FIM, FRF, GRD, HRK, IEP, ITL, LTL, LUF, LVL, MTL, NLG, PTE, SIT, SKK or EUR; a: number 0 to 1e12; y: whole number 1860 to 2025), e.g. https://how.box/fr/finance/old-currency/?d=to_euro&c=FIM&a=1000&y=1985. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, currency, calculator.
  - Agent tools: `old_currency_convert` (Converts a former euro-area currency (FIM, DEM, FRF, ITL, ESP, NLG, ATS, BEF, LUF, IEP, PTE, GRD, SIT, CYP, MTL, SKK, EEK, LVL, LTL, HRK, BGN) to euros or back at its fixed, irrevocable euro conversion rate (ECB).); `old_currency_adjust` (Finnish money in today's money (inflation in Finland), with Statistics Finland's money value coefficient (cost-of-living index 1914:1-6=100; official from 1921, unofficial estimates before; 1914 has no figure).)
  - Preset [Convertisseur mummonmarkka](https://how.box/fr/finance/mummonmarkka/): Combien cela fait-il en markka ? The same tool, preconfigured.
  - Preset [Calculateur d’inflation en Finlande](https://how.box/fr/finance/inflation/): Combien valent aujourd’hui 100 € de 2005 ? The same tool, preconfigured.
- [Calculateur de 1RM](https://how.box/fr/health/one-rep-max/): Combien pourriez-vous soulever en une seule répétition ? Votre charge maximale estimée (1RM) à partir d’une série réalisée, avec les charges pour 1 à 12 répétitions, selon la formule d’Epley ou de Brzycki.
  - Addresses: en https://how.box/health/one-rep-max/, en-us https://how.box/en-us/health/one-rep-max/, fi https://how.box/fi/health/one-rep-max/, de https://how.box/de/health/one-rep-max/, es https://how.box/es/health/one-rep-max/, fr https://how.box/fr/health/one-rep-max/, sv https://how.box/sv/health/one-rep-max/, it https://how.box/it/health/one-rep-max/, et https://how.box/et/health/one-rep-max/
  - Link to an answer: https://how.box/fr/health/one-rep-max/?w={w}&r={r}&f={f}&u={u} (w: number 0.5 to 1000; r: whole number 1 to 20; f: epley or brzycki; u: kg or lb), e.g. https://how.box/fr/health/one-rep-max/?w=100&r=5&f=brzycki&u=lb. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, fitness, weight.
  - Agent tools: `one_rep_max_calculate` (Estimated one-repetition maximum (1RM) from a set: weight lifted × repetitions to near failure.)
- [Calculateur d’allure de course](https://how.box/fr/health/pace/): À quelle allure devez-vous courir ? Convertir un temps d’arrivée en allure et vitesse, ou une allure en temps, avec les passages à chaque kilomètre ou mile.
  - Addresses: en https://how.box/health/pace/, en-us https://how.box/en-us/health/pace/, fi https://how.box/fi/health/pace/, de https://how.box/de/health/pace/, es https://how.box/es/health/pace/, fr https://how.box/fr/health/pace/, sv https://how.box/sv/health/pace/, it https://how.box/it/health/pace/, et https://how.box/et/health/pace/
  - Link to an answer: https://how.box/fr/health/pace/?f={f}&d={d}&du={du}&u={u}&h={h}&min={min}&s={s}&pm={pm}&ps={ps}&sp={sp} (f: time, pace or speed; d: number 0.1 to 1000; du: km or mi; u: km or mi; h: whole number 0 to 99; min: whole number 0 to 59; s: number 0 to 59.99; pm: whole number 0 to 59; ps: number 0 to 59.99; sp: number 0.1 to 60), e.g. https://how.box/fr/health/pace/?f=pace&d=21.0975&du=mi&u=mi&h=1&min=45&s=30&pm=6&ps=15&sp=10.5. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, speed, fitness, distance.
  - Agent tools: `pace_calculate` (Running pace, speed and finish time for a distance.)
  - Preset [Calculateur d’allure marathon](https://how.box/fr/health/marathon-pace/): Quelle allure faut-il pour votre objectif au marathon ? The same tool, preconfigured.
  - Preset [Calculateur d’allure semi-marathon](https://how.box/fr/health/half-marathon-pace/): Quelle allure faut-il pour votre objectif au semi-marathon ? The same tool, preconfigured.
- [Calculateur de peinture](https://how.box/fr/everyday/paint/): Combien de peinture faut-il pour une pièce ? Litres ou gallons de peinture et nombre de pots à acheter, selon la taille de la pièce, les couches et le rendement indiqué sur le pot.
  - Addresses: en https://how.box/everyday/paint/, en-us https://how.box/en-us/everyday/paint/, fi https://how.box/fi/everyday/paint/, de https://how.box/de/everyday/paint/, es https://how.box/es/everyday/paint/, fr https://how.box/fr/everyday/paint/, sv https://how.box/sv/everyday/paint/, it https://how.box/it/everyday/paint/, et https://how.box/et/everyday/paint/
  - Link to an answer: https://how.box/fr/everyday/paint/?l={l}&w={w}&h={h}&u={u}&ce={ce}&o={o}&ou={ou}&c={c}&r={r}&can={can}&cu={cu} (l: number 0.1 to 100; w: number 0.1 to 100; h: number 0.1 to 100; u: m, cm, ft or in; ce: boolean; o: number 0 to 1000; ou: m2 or ft2; c: whole number 1 to 5; r: number 1 to 30; can: number 0.1 to 50; cu: l, us_gal, us_qt or imp_gal), e.g. https://how.box/fr/everyday/paint/?l=4&w=3&h=2.5&u=m&ce=0&o=0&ou=m2&c=2&r=10&can=2.7&cu=l. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, area, volume, metric, imperial.
  - Agent tools: `paint_estimate` (Paint for a box-shaped room: walls 2 × (length + width) × height, plus the ceiling if asked, minus openings, times coats, divided by the coverage; cans rounded up.)
- [Formats de papier](https://how.box/fr/conversion/paper-size/): Quelles sont les dimensions de ce format de papier ? Retrouver les séries A, B et C, ainsi que Letter, Legal et Tabloid, en millimètres, centimètres, pouces ou points.
  - Addresses: en https://how.box/conversion/paper-size/, en-us https://how.box/en-us/conversion/paper-size/, fi https://how.box/fi/conversion/paper-size/, de https://how.box/de/conversion/paper-size/, es https://how.box/es/conversion/paper-size/, fr https://how.box/fr/conversion/paper-size/, sv https://how.box/sv/conversion/paper-size/, it https://how.box/it/conversion/paper-size/, et https://how.box/et/conversion/paper-size/
  - Link to an answer: https://how.box/fr/conversion/paper-size/?s={s}&u={u}&w={w}&h={h} (s: 4a0, 2a0, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, c0, c1, c2, c3, c4, c5, c6, c7, c8, c9, c10, letter, legal, tabloid, executive or statement; u: mm, cm, in or pt; w: number 0 to 10000; h: number 0 to 10000), e.g. https://how.box/fr/conversion/paper-size/?s=a5&u=cm&w=148&h=210. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: reference, length, metric, imperial.
  - Agent tools: `paper_size_lookup` (Gives the width and height of a standard paper size.)
- [Photo d’identité](https://how.box/fr/media/passport-photo/): Comment faire une photo d’identité au bon format ? Recadrez votre propre photo au format officiel, avec des repères pour la tête, et enregistrez-la en fichier ou en planche à imprimer. Elle ne quitte jamais votre appareil.
  - Addresses: en https://how.box/media/passport-photo/, en-us https://how.box/en-us/media/passport-photo/, fi https://how.box/fi/media/passport-photo/, de https://how.box/de/media/passport-photo/, es https://how.box/es/media/passport-photo/, fr https://how.box/fr/media/passport-photo/, sv https://how.box/sv/media/passport-photo/, it https://how.box/it/media/passport-photo/, et https://how.box/et/media/passport-photo/
  - Link to an answer: https://how.box/fr/media/passport-photo/?doc={doc}&out={out} (doc: gb-passport-print, gb-passport-online, fi-passport, ca-passport, ca-passport-online, fr-identity, us-passport or de-passport; out: file or sheet), e.g. https://how.box/fr/media/passport-photo/?doc=gb-passport-print&out=file. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, reference.
  - Agent tools: `passport_photo_rules` (Looks up the official size rules of a passport or identity card photo.)
- [Générateur de mots de passe](https://how.box/fr/web/password/): Quelle robustesse pour votre nouveau mot de passe ? Un mot de passe aléatoire créé sur votre appareil, avec sa robustesse en bits, sans aucun envoi.
  - Addresses: en https://how.box/web/password/, en-us https://how.box/en-us/web/password/, fi https://how.box/fi/web/password/, de https://how.box/de/web/password/, es https://how.box/es/web/password/, fr https://how.box/fr/web/password/, sv https://how.box/sv/web/password/, it https://how.box/it/web/password/, et https://how.box/et/web/password/
  - Link to an answer: https://how.box/fr/web/password/?len={len}&lower={lower}&upper={upper}&digits={digits}&symbols={symbols}&clear={clear} (len: whole number 4 to 128; lower: boolean; upper: boolean; digits: boolean; symbols: boolean; clear: boolean), e.g. https://how.box/fr/web/password/?len=16&lower=1&upper=1&digits=1&symbols=1&clear=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator.
  - Agent tools: `password_strength` (Measures how strong the passwords are that the generator makes with the given settings.)
- [Calcul de pourcentage](https://how.box/fr/math/percentage/): Combien cela fait-il en pourcentage ? Calculer un pourcentage, une proportion, une variation ou un écart relatif, ou retrouver un prix avant réduction.
  - Addresses: en https://how.box/math/percentage/, en-us https://how.box/en-us/math/percentage/, fi https://how.box/fi/math/percentage/, de https://how.box/de/math/percentage/, es https://how.box/es/math/percentage/, fr https://how.box/fr/math/percentage/, sv https://how.box/sv/math/percentage/, it https://how.box/it/math/percentage/, et https://how.box/et/math/percentage/
  - Link to an answer: https://how.box/fr/math/percentage/?m={m}&p={p}&a={a}&b={b}&d={d} (m: of, ratio, change, difference, reverse or before; p: number 0 to 1e6; a: number -1e12 to 1e12; b: number -1e12 to 1e12; d: decrease or increase), e.g. https://how.box/fr/math/percentage/?m=of&p=20&a=150&b=120&d=decrease. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, costs, statistics.
  - Agent tools: `percentage_calculate` (Percentage calculations, one per mode: of (percent % of a = percent ÷ 100 × a), ratio (a as a percentage of b = a ÷ b × 100), change (percentage change from old a to new b = (b − a) ÷ |a| × 100; negative is a decrease), difference (symmetric percentage difference = |a − b| ÷ ((|a| + |b|) ÷ 2) × 100, relative to the average), reverse (the whole of which a is percent % = a ÷ percent × 100), before (the value before a percent % decrease or increase, direction, that gave a = a ÷ (100 ∓ percent) × 100).)
  - Preset [Calcul de variation en pourcentage](https://how.box/fr/math/percentage-change/): Quelle est la hausse ou la baisse en pourcentage ? The same tool, preconfigured.
- [Calcul de l’âge des animaux](https://how.box/fr/everyday/pet-age/): Quel âge a votre animal en années humaines ? L’âge humain de votre chien ou chat selon la science actuelle, au-delà de l’ancienne règle ×7, avec son stade de vie.
  - Addresses: en https://how.box/everyday/pet-age/, en-us https://how.box/en-us/everyday/pet-age/, fi https://how.box/fi/everyday/pet-age/, de https://how.box/de/everyday/pet-age/, es https://how.box/es/everyday/pet-age/, fr https://how.box/fr/everyday/pet-age/, sv https://how.box/sv/everyday/pet-age/, it https://how.box/it/everyday/pet-age/, et https://how.box/et/everyday/pet-age/
  - Link to an answer: https://how.box/fr/everyday/pet-age/?p={p}&y={y}&m={m}&s={s} (p: dog or cat; y: whole number 0 to 30; m: whole number 0 to 11; s: small, medium or large), e.g. https://how.box/fr/everyday/pet-age/?p=dog&y=4&m=0&s=medium. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, converter.
  - Agent tools: `pet_age_calculate` (Estimates a dog's or cat's age in human years and names its veterinary life stage.)
  - Preset [Calcul de l’âge du chien](https://how.box/fr/everyday/dog-age/): Quel âge a votre chien en années humaines ? The same tool, preconfigured.
  - Preset [Calcul de l’âge du chat](https://how.box/fr/everyday/cat-age/): Quel âge a votre chat en années humaines ? The same tool, preconfigured.
- [Piano](https://how.box/fr/music/piano/): Et si vous jouiez du piano ici ? Jouer sur deux octaves à la souris, au toucher, au clavier d’ordinateur ou MIDI, avec pédale et noms des notes.
  - Addresses: en https://how.box/music/piano/, en-us https://how.box/en-us/music/piano/, fi https://how.box/fi/music/piano/, de https://how.box/de/music/piano/, es https://how.box/es/music/piano/, fr https://how.box/fr/music/piano/, sv https://how.box/sv/music/piano/, it https://how.box/it/music/piano/, et https://how.box/et/music/piano/
  - Link to an answer: https://how.box/fr/music/piano/?v={v}&o={o}&l={l}&n={n} (v: piano, organ, marimba or xylophone; o: whole number 1 to 6; l: both, notes, keys or none; n: whole number 0 to 127), e.g. https://how.box/fr/music/piano/?v=piano&o=3&l=both&n=69. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: sound.
  - Agent tools: `piano_note` (Looks up a musical note: its MIDI number, frequency, names and whether it is a black key.); `piano_nearest_note` (Finds the equal-tempered note nearest to a frequency and how far off it is in cents (positive = sharp).)
- [Tirage au sort de noms](https://how.box/fr/everyday/picker/): Qui sera tiré au sort ? Faire tourner la roue pour choisir des gagnants dans une liste, ou répartir tout le monde en équipes équilibrées.
  - Addresses: en https://how.box/everyday/picker/, en-us https://how.box/en-us/everyday/picker/, fi https://how.box/fi/everyday/picker/, de https://how.box/de/everyday/picker/, es https://how.box/es/everyday/picker/, fr https://how.box/fr/everyday/picker/, sv https://how.box/sv/everyday/picker/, it https://how.box/it/everyday/picker/, et https://how.box/et/everyday/picker/
  - Link to an answer: https://how.box/fr/everyday/picker/?n={n}&m={m}&w={w}&t={t}&r={r} (n: text; m: winners or teams; w: whole number 1 to 100; t: whole number 2 to 50; r: boolean), e.g. https://how.box/fr/everyday/picker/?n=Alex%0ABlair%0ACasey&m=winners&w=1&t=2&r=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator.
  - Agent tools: `picker_pick` (Picks random winners from a list, or splits the list into teams, with the browser's cryptographically secure random generator (uniform, no repeats).)
- [Minuteur Pomodoro](https://how.box/fr/datetime/pomodoro/): Combien de temps se concentrer avant une pause ? Alterner séances de concentration et pauses, avec un son à la fin de chacune.
  - Addresses: en https://how.box/datetime/pomodoro/, en-us https://how.box/en-us/datetime/pomodoro/, fi https://how.box/fi/datetime/pomodoro/, de https://how.box/de/datetime/pomodoro/, es https://how.box/es/datetime/pomodoro/, fr https://how.box/fr/datetime/pomodoro/, sv https://how.box/sv/datetime/pomodoro/, it https://how.box/it/datetime/pomodoro/, et https://how.box/et/datetime/pomodoro/
  - Link to an answer: https://how.box/fr/datetime/pomodoro/?w={w}&s={s}&l={l}&n={n} (w: whole number 1 to 180; s: whole number 1 to 60; l: whole number 1 to 120; n: whole number 2 to 12), e.g. https://how.box/fr/datetime/pomodoro/?w=25&s=5&l=15&n=4. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, sound.
  - Agent tools: `pomodoro_plan` (The schedule of a Pomodoro cycle.)
- [Conversion de puissance](https://how.box/fr/conversion/power/): Combien vaut cette puissance dans d’autres unités ? Convertir exactement watts, kilowatts, mégawatts, chevaux mécaniques, chevaux métriques et BTU par heure.
  - Addresses: en https://how.box/conversion/power/, en-us https://how.box/en-us/conversion/power/, fi https://how.box/fi/conversion/power/, de https://how.box/de/conversion/power/, es https://how.box/es/conversion/power/, fr https://how.box/fr/conversion/power/, sv https://how.box/sv/conversion/power/, it https://how.box/it/conversion/power/, et https://how.box/et/conversion/power/
  - Link to an answer: https://how.box/fr/conversion/power/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: mw, w, kw, megawatt, hp, ps or btu_h; to: mw, w, kw, megawatt, hp, ps or btu_h), e.g. https://how.box/fr/conversion/power/?v=1&from=kw&to=hp. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, energy, metric.
  - Agent tools: `power_convert` (Converts a power between units using exact definitions (1 kW = 1000 W, 1 MW = 1e6 W, mechanical horsepower 550 ft·lbf/s = 745.69987158227022 W, metric horsepower (PS) 75 kgf·m/s = 735.49875 W, 1 BTU/h = 1055.05585262 J / 3600 s; BIPM SI Brochure, NIST SP 811 B.8).)
  - Preset [Chevaux en kilowatts](https://how.box/fr/conversion/hp-to-kw/): Combien de kilowatts vaut un cheval mécanique ? The same tool, preconfigured.
- [Calcul de densité d’écran](https://how.box/fr/media/ppi/): Quelle est la finesse de votre écran ? Saisir la définition et la taille de l’écran pour obtenir pixels par pouce, pas de pixel et dimensions physiques.
  - Addresses: en https://how.box/media/ppi/, en-us https://how.box/en-us/media/ppi/, fi https://how.box/fi/media/ppi/, de https://how.box/de/media/ppi/, es https://how.box/es/media/ppi/, fr https://how.box/fr/media/ppi/, sv https://how.box/sv/media/ppi/, it https://how.box/it/media/ppi/, et https://how.box/et/media/ppi/
  - Link to an answer: https://how.box/fr/media/ppi/?w={w}&h={h}&d={d}&du={du} (w: whole number 1 to 100000; h: whole number 1 to 100000; d: number 0 to 10000; du: in or cm), e.g. https://how.box/fr/media/ppi/?w=2560&h=1440&d=27&du=cm. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, length, geometry.
  - Agent tools: `ppi_calculate` (Pixel density of a screen: ppi = √(width² + height²) ÷ diagonal in inches, assuming square pixels.)
- [Calculateur de valeur actuelle](https://how.box/fr/finance/present-value/): Combien vaut aujourd’hui une somme future ? Actualisez un montant futur en argent d’aujourd’hui, au taux de votre choix.
  - Addresses: en https://how.box/finance/present-value/, en-us https://how.box/en-us/finance/present-value/, fi https://how.box/fi/finance/present-value/, de https://how.box/de/finance/present-value/, es https://how.box/es/finance/present-value/, fr https://how.box/fr/finance/present-value/, sv https://how.box/sv/finance/present-value/, it https://how.box/it/finance/present-value/, et https://how.box/et/finance/present-value/
  - Link to an answer: https://how.box/fr/finance/present-value/?fv={fv}&r={r}&y={y} (fv: number 0 to 1e12; r: number 0 to 100; y: number 0 to 100), e.g. https://how.box/fr/finance/present-value/?fv=10000&r=5&y=10. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, interest, savings.
  - Agent tools: `present_value_calculate` (Present value of one future amount: PV = future_amount ÷ (1 + rate_percent/100)^years, compounded yearly.)
- [Conversion de pression](https://how.box/fr/conversion/pressure/): Combien vaut cette pression dans d’autres unités ? Convertir pascals, hectopascals, kilopascals, bars, psi, atmosphères, mmHg et inHg.
  - Addresses: en https://how.box/conversion/pressure/, en-us https://how.box/en-us/conversion/pressure/, fi https://how.box/fi/conversion/pressure/, de https://how.box/de/conversion/pressure/, es https://how.box/es/conversion/pressure/, fr https://how.box/fr/conversion/pressure/, sv https://how.box/sv/conversion/pressure/, it https://how.box/it/conversion/pressure/, et https://how.box/et/conversion/pressure/
  - Link to an answer: https://how.box/fr/conversion/pressure/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: pa, hpa, kpa, bar, psi, inhg, mmhg or atm; to: pa, hpa, kpa, bar, psi, inhg, mmhg or atm), e.g. https://how.box/fr/conversion/pressure/?v=1&from=bar&to=psi. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, metric, imperial.
  - Agent tools: `pressure_convert` (Converts a pressure between units using exact definitions (1 hPa = 100 Pa, 1 kPa = 1000 Pa, 1 bar = 100000 Pa, 1 atm = 101325 Pa, 1 psi = 6894.757293 Pa, conventional mmHg = 133.3223874 Pa, conventional inHg = 3386.388641 Pa; BIPM SI Brochure, NIST SP 811 B.8).)
- [Test de nombre premier](https://how.box/fr/math/prime/): Votre nombre est-il premier ? Tester un entier jusqu’à 100 chiffres, avec ses facteurs premiers, le nombre premier précédent et le suivant.
  - Addresses: en https://how.box/math/prime/, en-us https://how.box/en-us/math/prime/, fi https://how.box/fi/math/prime/, de https://how.box/de/math/prime/, es https://how.box/es/math/prime/, fr https://how.box/fr/math/prime/, sv https://how.box/sv/math/prime/, it https://how.box/it/math/prime/, et https://how.box/et/math/prime/
  - Link to an answer: https://how.box/fr/math/prime/?n={n} (n: text), e.g. https://how.box/fr/math/prime/?n=1200. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, checker.
  - Agent tools: `prime_check` (Is a whole number of up to 100 digits prime?)
- [Roue des lots](https://how.box/fr/everyday/prize-wheel/): Que gagnerez-vous ? Lister les lots, tourner la roue et les distribuer un par un : un tirage équitable pour tombolas, fêtes et événements.
  - Addresses: en https://how.box/everyday/prize-wheel/, en-us https://how.box/en-us/everyday/prize-wheel/, fi https://how.box/fi/everyday/prize-wheel/, de https://how.box/de/everyday/prize-wheel/, es https://how.box/es/everyday/prize-wheel/, fr https://how.box/fr/everyday/prize-wheel/, sv https://how.box/sv/everyday/prize-wheel/, it https://how.box/it/everyday/prize-wheel/, et https://how.box/et/everyday/prize-wheel/
  - Link to an answer: https://how.box/fr/everyday/prize-wheel/?p={p}&c={c}&r={r} (p: text; c: whole number 5 to 100; r: boolean), e.g. https://how.box/fr/everyday/prize-wheel/?p=Gift+card+%C3%972%0AT-shirt&c=50&r=1. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator.
  - Agent tools: `prize_wheel_spin` (Spins a prize wheel: draws prizes from a list with the browser's cryptographically secure random generator.)
- [Calculateur d’alcoolémie](https://how.box/fr/health/promille/): Combien d’alcool avez-vous dans le sang ? Une estimation approximative de votre alcoolémie en pour mille (‰) et du temps que met votre corps à éliminer l’alcool, selon la formule de Widmark.
  - Addresses: en https://how.box/health/promille/, en-us https://how.box/en-us/health/promille/, fi https://how.box/fi/health/promille/, de https://how.box/de/health/promille/, es https://how.box/es/health/promille/, fr https://how.box/fr/health/promille/, sv https://how.box/sv/health/promille/, it https://how.box/it/health/promille/, et https://how.box/et/health/promille/
  - Link to an answer: https://how.box/fr/health/promille/?s={s}&u={u}&w={w}&lb={lb}&b={b}&wn={wn}&sp={sp}&h={h}&bml={bml}&bab={bab}&wml={wml}&wab={wab}&sml={sml}&sab={sab} (s: female or male; u: metric or us; w: number 30 to 250; lb: number 66 to 550; b: number 0 to 40; wn: number 0 to 40; sp: number 0 to 40; h: number 0 to 48; bml: number 10 to 1000; bab: number 0.5 to 80; wml: number 10 to 1000; wab: number 0.5 to 80; sml: number 10 to 1000; sab: number 0.5 to 80), e.g. https://how.box/fr/health/promille/?s=male&u=us&w=80&lb=180&b=3&wn=2&sp=1&h=2&bml=500&bab=5.5&wml=160&wab=13.5&sml=20&sab=38. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `promille_estimate` (A rough blood alcohol estimate in per mille (‰, g/kg) by the Widmark formula: ‰ = grams of ethanol / (r × body weight kg) − 0.15 × hours, r 0.68 for men and 0.55 for women; grams = count × volume ml × ABV × 0.789.)
- [Générateur de codes QR](https://how.box/fr/media/qr-code/): Comment créer un code QR ? Des codes statiques créés sur votre appareil : sans expiration, redirection ni suivi des scans.
  - Addresses: en https://how.box/media/qr-code/, en-us https://how.box/en-us/media/qr-code/, fi https://how.box/fi/media/qr-code/, de https://how.box/de/media/qr-code/, es https://how.box/es/media/qr-code/, fr https://how.box/fr/media/qr-code/, sv https://how.box/sv/media/qr-code/, it https://how.box/it/media/qr-code/, et https://how.box/et/media/qr-code/
  - Link to an answer: https://how.box/fr/media/qr-code/?k={k}&e={e}&s={s}&t={t}&ssid={ssid}&sec={sec}&hid={hid}&fn={fn}&ln={ln}&org={org}&jt={jt}&tel={tel}&em={em}&web={web}&st={st}&pc={pc}&ci={ci}&co={co}&to={to}&su={su}&bo={bo}&sn={sn}&sm={sm}&et={et}&ed={ed}&es={es}&eed={eed}&ee={ee}&el={el}&lat={lat}&lon={lon}&bn={bn}&iban={iban}&bic={bic}&am={am}&rf={rf}&msg={msg} (k: text, wifi, vcard, email, sms, event, geo or payment; e: L, M, Q or H; s: small, medium or large; t: text; ssid: text; sec: WPA, WEP or nopass; hid: boolean; fn: text; ln: text; org: text; jt: text; tel: text; em: text; web: text; st: text; pc: text; ci: text; co: text; to: text; su: text; bo: text; sn: text; sm: text; et: text; ed: text; es: text; eed: text; ee: text; el: text; lat: number -90 to 90; lon: number -180 to 180; bn: text; iban: text; bic: text; am: number 0.01 to 9.9999999999e8; rf: text; msg: text), e.g. https://how.box/fr/media/qr-code/?k=text&e=M&s=medium&t=https%3A%2F%2Fhow.box%2F&ssid=Home&sec=WPA&hid=0&fn=Aino&ln=Virtanen&org=Example+Oy&jt=Designer&tel=%2B358+40+123+4567&em=aino%40example.com&web=https%3A%2F%2Fexample.com%2F&st=Mannerheimintie+1&pc=00100&ci=Helsinki&co=Finland&to=info%40example.com&su=Hello&bo=Hi%21&sn=%2B358+40+123+4567&sm=Hi%21&et=Meeting&ed=2026-11-05&es=18%3A00&eed=2026-11-05&ee=20%3A00&el=Helsinki&lat=60.169857&lon=24.938379&bn=Example+Oy&iban=FI21+1234+5600+0007+85&bic=NDEAFIHH&am=12.5&rf=RF18+5390+0754+7034&msg=Invoice+123. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, encoding.
  - Agent tools: `qr_code_make` (Makes a static QR code (ISO/IEC 18004) in the browser: no redirect, no expiry, no scan tracking.)
  - Preset [Code QR Wi-Fi](https://how.box/fr/media/wifi-qr/): Comment créer un code QR pour votre Wi-Fi ? The same tool, preconfigured.
  - Preset [Code QR de contact (vCard)](https://how.box/fr/media/vcard-qr/): Comment mettre vos coordonnées dans un code QR ? The same tool, preconfigured.
  - Preset [Code QR e-mail](https://how.box/fr/media/email-qr/): Comment créer un code QR qui prépare un e-mail ? The same tool, preconfigured.
  - Preset [Code QR SMS](https://how.box/fr/media/sms-qr/): Comment créer un code QR pour envoyer un SMS ? The same tool, preconfigured.
  - Preset [Code QR d’événement](https://how.box/fr/media/event-qr/): Comment créer un code QR pour un événement de calendrier ? The same tool, preconfigured.
  - Preset [Code QR de position](https://how.box/fr/media/geo-qr/): Comment créer un code QR pour un lieu ? The same tool, preconfigured.
  - Preset [Code QR de paiement (EPC QR)](https://how.box/fr/media/payment-qr/): Comment créer un code QR pour un virement ? The same tool, preconfigured.
- [Nombre aléatoire](https://how.box/fr/everyday/random-number/): Quel nombre le hasard choisira-t-il ? Des nombres aléatoires équitables issus du générateur sécurisé de votre appareil, avec ou sans répétition.
  - Addresses: en https://how.box/everyday/random-number/, en-us https://how.box/en-us/everyday/random-number/, fi https://how.box/fi/everyday/random-number/, de https://how.box/de/everyday/random-number/, es https://how.box/es/everyday/random-number/, fr https://how.box/fr/everyday/random-number/, sv https://how.box/sv/everyday/random-number/, it https://how.box/it/everyday/random-number/, et https://how.box/et/everyday/random-number/
  - Link to an answer: https://how.box/fr/everyday/random-number/?mode={mode}&min={min}&max={max}&n={n}&u={u}&s={s} (mode: numbers or coin; min: whole number -1e9 to 1e9; max: whole number -1e9 to 1e9; n: whole number 1 to 1000; u: boolean; s: boolean), e.g. https://how.box/fr/everyday/random-number/?mode=numbers&min=1&max=100&n=1&u=0&s=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, statistics.
  - Agent tools: `random_number_generate` (Draws random integers between min and max (both included), or flips a fair coin, with the browser's cryptographically secure random generator (uniform, no modulo bias).)
  - Preset [Pile ou face](https://how.box/fr/everyday/coin-flip/): Pile ou face ? The same tool, preconfigured.
- [Calculateur de rapports](https://how.box/fr/math/ratio/): Comment simplifier un rapport ou trouver le nombre manquant ? Simplifier un rapport ou trouver le terme manquant d’une proportion avec la règle de trois.
  - Addresses: en https://how.box/math/ratio/, en-us https://how.box/en-us/math/ratio/, fi https://how.box/fi/math/ratio/, de https://how.box/de/math/ratio/, es https://how.box/es/math/ratio/, fr https://how.box/fr/math/ratio/, sv https://how.box/sv/math/ratio/, it https://how.box/it/math/ratio/, et https://how.box/et/math/ratio/
  - Link to an answer: https://how.box/fr/math/ratio/?m={m}&a={a}&b={b}&k={k}&c={c} (m: simplify or solve; a: number 0 to 1e9; b: number 0 to 1e9; k: first or second; c: number 0 to 1e9), e.g. https://how.box/fr/math/ratio/?m=simplify&a=1920&b=1080&k=first&c=1280. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `ratio_calculate` (Ratio arithmetic on a : b with positive terms (at most 6 decimals each).)
- [Générateur de numéro de référence](https://how.box/fr/finance/reference-number/): Comment créer un numéro de référence de paiement valide ? Créez une référence de paiement finlandaise avec sa clé de contrôle, ou vérifiez-en une, avec sa forme RF.
  - Addresses: en https://how.box/finance/reference-number/, en-us https://how.box/en-us/finance/reference-number/, fi https://how.box/fi/finance/reference-number/, de https://how.box/de/finance/reference-number/, es https://how.box/es/finance/reference-number/, fr https://how.box/fr/finance/reference-number/, sv https://how.box/sv/finance/reference-number/, it https://how.box/it/finance/reference-number/, et https://how.box/et/finance/reference-number/
  - Link to an answer: https://how.box/fr/finance/reference-number/?m={m}&r={r}&b={b} (m: check or create; r: text; b: text), e.g. https://how.box/fr/finance/reference-number/?m=check&r=12345672&b=1234567. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, checker. Countries: FI (Finlande).
  - Agent tools: `reference_number_check` (Check a payment reference: a Finnish reference number (viitenumero, 4–20 digits, 7-3-1 check digit) or an ISO 11649 RF creditor reference (MOD 97-10).); `reference_number_create` (Create a Finnish reference number (viitenumero) from a base of 3–19 digits by appending the 7-3-1 check digit.)
- [Calculateur de refinancement](https://how.box/fr/finance/refinance/): Combien pourriez-vous économiser en refinançant votre prêt ? Comparer la nouvelle mensualité aux frais et aux intérêts restants du prêt actuel.
  - Addresses: en https://how.box/finance/refinance/, en-us https://how.box/en-us/finance/refinance/, fi https://how.box/fi/finance/refinance/, de https://how.box/de/finance/refinance/, es https://how.box/es/finance/refinance/, fr https://how.box/fr/finance/refinance/, sv https://how.box/sv/finance/refinance/, it https://how.box/it/finance/refinance/, et https://how.box/et/finance/refinance/
  - Link to an answer: https://how.box/fr/finance/refinance/?b={b}&r={r}&n={n}&s={s}&m={m}&f={f}&c={c} (b: number 0 to 1e7; r: number 0 to 100; n: whole number 1 to 600; s: number 0 to 100; m: whole number 1 to 600; f: number 0 to 1e6; c: text), e.g. https://how.box/fr/finance/refinance/?b=200000&r=6&n=240&s=5&m=240&f=2500&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, loans, interest, costs.
  - Agent tools: `refinance_calculate` (Compare keeping a fixed-rate loan with refinancing the same outstanding balance.)
- [Calculateur louer ou acheter](https://how.box/fr/finance/rent-vs-buy/): Vaut-il mieux louer ou acheter votre logement ? Comparez location et achat sur le nombre d’années où vous comptez rester, avec toutes les hypothèses sous les yeux.
  - Addresses: en https://how.box/finance/rent-vs-buy/, en-us https://how.box/en-us/finance/rent-vs-buy/, fi https://how.box/fi/finance/rent-vs-buy/, de https://how.box/de/finance/rent-vs-buy/, es https://how.box/es/finance/rent-vs-buy/, fr https://how.box/fr/finance/rent-vs-buy/, sv https://how.box/sv/finance/rent-vs-buy/, it https://how.box/it/finance/rent-vs-buy/, et https://how.box/et/finance/rent-vs-buy/
  - Link to an answer: https://how.box/fr/finance/rent-vs-buy/?p={p}&d={d}&r={r}&t={t}&rent={rent}&y={y}&hg={hg}&rg={rg}&ir={ir}&bc={bc}&sc={sc}&oc={oc}&c={c} (p: number 0 to 1e8; d: number 0 to 1e8; r: number 0 to 30; t: whole number 1 to 50; rent: number 0 to 1e8; y: whole number 1 to 40; hg: number -10 to 20; rg: number -10 to 20; ir: number -10 to 20; bc: number 0 to 20; sc: number 0 to 20; oc: number 0 to 10; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL), e.g. https://how.box/fr/finance/rent-vs-buy/?p=250000&d=50000&r=4&t=25&rent=1000&y=10&hg=2&rg=2.5&ir=5&bc=2&sc=3&oc=1.5&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, housing, loans, costs.
  - Agent tools: `rent_vs_buy_compare` (Rent or buy over `years`: two households start with the same cash (down payment + buying costs) and put in the same money each month (the larger housing cost).)
- [Code couleur des résistances](https://how.box/fr/physics/resistor/): Comment lire les anneaux de couleur d’une résistance ? Transformez 4, 5 ou 6 anneaux de couleur en ohms et en tolérance, ou trouvez les anneaux d’une valeur.
  - Addresses: en https://how.box/physics/resistor/, en-us https://how.box/en-us/physics/resistor/, fi https://how.box/fi/physics/resistor/, de https://how.box/de/physics/resistor/, es https://how.box/es/physics/resistor/, fr https://how.box/fr/physics/resistor/, sv https://how.box/sv/physics/resistor/, it https://how.box/it/physics/resistor/, et https://how.box/et/physics/resistor/
  - Link to an answer: https://how.box/fr/physics/resistor/?m={m}&b={b}&r={r}&ru={ru}&n={n}&t={t}&c={c} (m: decode or encode; b: text; r: number 0.01 to 1e11; ru: milliohm, ohm, kohm or megohm; n: 4, 5 or 6; t: 20, 10, 5, 2, 1, 0.5, 0.25, 0.1, 0.05, 0.02 or 0.01; c: 250, 100, 50, 25, 20, 15, 10, 5 or 1), e.g. https://how.box/fr/physics/resistor/?m=encode&b=yellow-violet-red-gold&r=4700&ru=kohm&n=5&t=1&c=100. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `resistor_color_code` (Resistor colour code (IEC 60062).)
- [Calculateur de ROI](https://how.box/fr/finance/roi/): Combien votre investissement vous a-t-il rapporté ? Obtenez le rendement total, le gain et le taux annuel équivalent.
  - Addresses: en https://how.box/finance/roi/, en-us https://how.box/en-us/finance/roi/, fi https://how.box/fi/finance/roi/, de https://how.box/de/finance/roi/, es https://how.box/es/finance/roi/, fr https://how.box/fr/finance/roi/, sv https://how.box/sv/finance/roi/, it https://how.box/it/finance/roi/, et https://how.box/et/finance/roi/
  - Link to an answer: https://how.box/fr/finance/roi/?i={i}&f={f}&y={y} (i: number 0.01 to 1e9; f: number 0 to 1e12; y: number 0 to 100), e.g. https://how.box/fr/finance/roi/?i=10000&f=15000&y=5. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, savings, interest.
  - Agent tools: `roi_calculate` (Return on investment from the amount invested, the final value (including payouts) and the holding period in years.)
  - Preset [Calculateur de TCAC](https://how.box/fr/finance/cagr/): De combien a-t-il progressé chaque année ? The same tool, preconfigured.
- [Conversion de chiffres romains](https://how.box/fr/conversion/roman/): Comment écrire ce nombre en chiffres romains ? Convertir nombres et chiffres romains dans les deux sens, sous leur forme standard de 1 à 3 999.
  - Addresses: en https://how.box/conversion/roman/, en-us https://how.box/en-us/conversion/roman/, fi https://how.box/fi/conversion/roman/, de https://how.box/de/conversion/roman/, es https://how.box/es/conversion/roman/, fr https://how.box/fr/conversion/roman/, sv https://how.box/sv/conversion/roman/, it https://how.box/it/conversion/roman/, et https://how.box/et/conversion/roman/
  - Link to an answer: https://how.box/fr/conversion/roman/?v={v} (v: text), e.g. https://how.box/fr/conversion/roman/?v=XLII. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, calculator.
  - Agent tools: `roman_convert` (Convert between numbers and Roman numerals in standard form (subtractive pairs IV, IX, XL, XC, CD, CM; 1 to 3999).)
- [Conversion de salaire](https://how.box/fr/finance/salary/): Combien vaut votre salaire sur une autre période ? Comparer les rémunérations brutes selon votre propre rythme de travail.
  - Addresses: en https://how.box/finance/salary/, en-us https://how.box/en-us/finance/salary/, fi https://how.box/fi/finance/salary/, de https://how.box/de/finance/salary/, es https://how.box/es/finance/salary/, fr https://how.box/fr/finance/salary/, sv https://how.box/sv/finance/salary/, it https://how.box/it/finance/salary/, et https://how.box/et/finance/salary/
  - Link to an answer: https://how.box/fr/finance/salary/?a={a}&p={p}&c={c}&h={h}&d={d}&w={w} (a: number 0 to 1e8; p: hourly, daily, weekly, monthly or yearly; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL; h: number 0.1 to 168; d: whole number 1 to 7; w: number 0.1 to 52), e.g. https://how.box/fr/finance/salary/?a=25&p=hourly&c=EUR&h=40&d=5&w=52. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, currency.
  - Agent tools: `salary_calculate` (Convert gross pay between hourly, daily, weekly, average monthly and yearly amounts using paid hours/week, workdays/week and paid weeks/year.)
- [Calculateur de taille d’échantillon](https://how.box/fr/math/sample-size/): Combien de réponses faut-il pour votre enquête ? Le nombre de réponses nécessaires à votre enquête pour une marge d’erreur et un niveau de confiance donnés, quelle que soit la taille de la population.
  - Addresses: en https://how.box/math/sample-size/, en-us https://how.box/en-us/math/sample-size/, fi https://how.box/fi/math/sample-size/, de https://how.box/de/math/sample-size/, es https://how.box/es/math/sample-size/, fr https://how.box/fr/math/sample-size/, sv https://how.box/sv/math/sample-size/, it https://how.box/it/math/sample-size/, et https://how.box/et/math/sample-size/
  - Link to an answer: https://how.box/fr/math/sample-size/?e={e}&c={c}&pop={pop}&n={n}&p={p} (e: number 0.1 to 50; c: number 50 to 99.99; pop: large or known; n: whole number 1 to 1e9; p: number 1 to 99), e.g. https://how.box/fr/math/sample-size/?e=5&c=95&pop=known&n=1000&p=50. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, statistics.
  - Agent tools: `sample_size_calculate` (Survey sample size to estimate a proportion within ± margin_percent points at confidence_percent confidence: n₀ = z² p(1 − p) / e² (p = proportion_percent ÷ 100, 50 by default and the most cautious), rounded up.)
- [Calcul d’objectif d’épargne](https://how.box/fr/finance/savings-goal/): Combien épargner pour atteindre votre objectif ? Voir le versement mensuel ou annuel qui permet d’atteindre votre objectif à temps.
  - Addresses: en https://how.box/finance/savings-goal/, en-us https://how.box/en-us/finance/savings-goal/, fi https://how.box/fi/finance/savings-goal/, de https://how.box/de/finance/savings-goal/, es https://how.box/es/finance/savings-goal/, fr https://how.box/fr/finance/savings-goal/, sv https://how.box/sv/finance/savings-goal/, it https://how.box/it/finance/savings-goal/, et https://how.box/et/finance/savings-goal/
  - Link to an answer: https://how.box/fr/finance/savings-goal/?g={g}&p={p}&r={r}&y={y}&f={f}&w={w}&n={n}&c={c} (g: number 0 to 1e9; p: number 0 to 1e9; r: number 0 to 50; y: whole number 1 to 100; f: month or year; w: end or start; n: year, quarter, month or day; c: text), e.g. https://how.box/fr/finance/savings-goal/?g=50000&p=5000&r=4&y=10&f=month&w=end&n=month&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, savings, interest.
  - Agent tools: `savings_goal_calculate` (The regular deposit needed to reach a savings goal.)
- [Calculatrice scientifique](https://how.box/fr/math/scientific/): Combien vaut ce calcul ? Saisir un calcul ou utiliser les touches.
  - Addresses: en https://how.box/math/scientific/, en-us https://how.box/en-us/math/scientific/, fi https://how.box/fi/math/scientific/, de https://how.box/de/math/scientific/, es https://how.box/es/math/scientific/, fr https://how.box/fr/math/scientific/, sv https://how.box/sv/math/scientific/, it https://how.box/it/math/scientific/, et https://how.box/et/math/scientific/
  - Link to an answer: https://how.box/fr/math/scientific/?e={e}&a={a}&d={d}&ans={ans} (e: text; a: deg or rad; d: . or ,; ans: number), e.g. https://how.box/fr/math/scientific/?e=sin%2830%29&a=deg&d=.&ans=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `scientific_calculate` (Evaluate a real mathematical expression with arithmetic, powers, factorials, percentages, trig, logarithms and roots.)
- [Conversion en notation scientifique](https://how.box/fr/math/scientific-notation/): Comment écrire ce nombre en notation scientifique ? Écrire un nombre en notation scientifique ou ingénieur avec la précision choisie, ou développer 6,022e23 en chiffres.
  - Addresses: en https://how.box/math/scientific-notation/, en-us https://how.box/en-us/math/scientific-notation/, fi https://how.box/fi/math/scientific-notation/, de https://how.box/de/math/scientific-notation/, es https://how.box/es/math/scientific-notation/, fr https://how.box/fr/math/scientific-notation/, sv https://how.box/sv/math/scientific-notation/, it https://how.box/it/math/scientific-notation/, et https://how.box/et/math/scientific-notation/
  - Link to an answer: https://how.box/fr/math/scientific-notation/?n={n}&s={s} (n: text; s: whole number 1 to 20), e.g. https://how.box/fr/math/scientific-notation/?n=12500&s=3. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `scientific_notation_calculate` (Writes a number in scientific notation (mantissa m with 1 ≤ |m| < 10, times 10 to an integer exponent) and in engineering notation (exponent a multiple of 3, 1 ≤ |m| < 1000), rounded half up to a number of significant figures from the typed decimal digits.)
- [Alphabet sémaphore à bras](https://how.box/fr/text/semaphore/): Comment écrire votre nom avec des drapeaux sémaphores ? Transformer du texte en figures sémaphores ou retrouver une lettre à partir de la position des deux bras.
  - Addresses: en https://how.box/text/semaphore/, en-us https://how.box/en-us/text/semaphore/, fi https://how.box/fi/text/semaphore/, de https://how.box/de/text/semaphore/, es https://how.box/es/text/semaphore/, fr https://how.box/fr/text/semaphore/, sv https://how.box/sv/text/semaphore/, it https://how.box/it/text/semaphore/, et https://how.box/et/text/semaphore/
  - Link to an answer: https://how.box/fr/text/semaphore/?d={d}&m={m}&l={l}&r={r} (d: encode or decode; m: text; l: up, high, out, low, down, across-low or across-high; r: up, high, out, low, down, across-low or across-high), e.g. https://how.box/fr/text/semaphore/?d=decode&m=HELLO&l=down&r=low. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, encoding.
  - Agent tools: `semaphore_encode` (Write text in flag semaphore.); `semaphore_decode` (Read one flag semaphore sign from the positions of the signaller's left and right arms.)
- [Calculateur série et parallèle](https://how.box/fr/physics/series-parallel/): Comment s’additionnent les résistances et les condensateurs ? Associez de 2 à 12 résistances ou condensateurs et voyez la valeur équivalente.
  - Addresses: en https://how.box/physics/series-parallel/, en-us https://how.box/en-us/physics/series-parallel/, fi https://how.box/fi/physics/series-parallel/, de https://how.box/de/physics/series-parallel/, es https://how.box/es/physics/series-parallel/, fr https://how.box/fr/physics/series-parallel/, sv https://how.box/sv/physics/series-parallel/, it https://how.box/it/physics/series-parallel/, et https://how.box/et/physics/series-parallel/
  - Link to an answer: https://how.box/fr/physics/series-parallel/?k={k}&a={a}&p={p} (k: resistor or capacitor; a: series or parallel; p: array), e.g. https://how.box/fr/physics/series-parallel/?k=resistor&a=series&p=%7E1%3Ap1..kohm_p2..kohm. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `series_parallel_combine` (Equivalent value of 2–12 resistors or capacitors in series or in parallel.)
- [Aire des figures](https://how.box/fr/math/shape-area/): Quelle est l’aire de cette figure ? Aire et périmètre de rectangles, cercles, triangles et huit autres figures, dessinés à l’échelle.
  - Addresses: en https://how.box/math/shape-area/, en-us https://how.box/en-us/math/shape-area/, fi https://how.box/fi/math/shape-area/, de https://how.box/de/math/shape-area/, es https://how.box/es/math/shape-area/, fr https://how.box/fr/math/shape-area/, sv https://how.box/sv/math/shape-area/, it https://how.box/it/math/shape-area/, et https://how.box/et/math/shape-area/
  - Link to an answer: https://how.box/fr/math/shape-area/?s={s}&a={a}&b={b}&c={c}&n={n}&t={t}&u={u}&au={au} (s: rectangle, square, circle, triangle, parallelogram, trapezoid, rhombus, ellipse, polygon, sector or annulus; a: number 0.000001 to 1e6; b: number 0.000001 to 1e6; c: number 0.000001 to 1e6; n: whole number 3 to 1000; t: number 0 to 6.283185307179586; u: mm, cm, m, in, ft or yd; au: deg or rad), e.g. https://how.box/fr/math/shape-area/?s=rectangle&a=4&b=3&c=2&n=6&t=1.5707963267948966&u=m&au=deg. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, geometry, area, metric, imperial.
  - Agent tools: `shape_area_calculate` (Area and perimeter of a plane shape (CRC Standard Mathematical Tables §4.5–4.6; triangle by Heron, ellipse perimeter by Ramanujan's approximation).)
- [Volume des solides](https://how.box/fr/math/shape-volume/): Combien ce solide peut-il contenir ? Volume et surface de pavés, cylindres, sphères, cônes et sept autres solides, aussi en litres et en gallons.
  - Addresses: en https://how.box/math/shape-volume/, en-us https://how.box/en-us/math/shape-volume/, fi https://how.box/fi/math/shape-volume/, de https://how.box/de/math/shape-volume/, es https://how.box/es/math/shape-volume/, fr https://how.box/fr/math/shape-volume/, sv https://how.box/sv/math/shape-volume/, it https://how.box/it/math/shape-volume/, et https://how.box/et/math/shape-volume/
  - Link to an answer: https://how.box/fr/math/shape-volume/?s={s}&a={a}&b={b}&c={c}&u={u} (s: cuboid, cube, cylinder, sphere, cone, pyramid, frustum, hemisphere, capsule, torus or ellipsoid; a: number 0.000001 to 100000; b: number 0.000001 to 100000; c: number 0.000001 to 100000; u: mm, cm, m, in, ft or yd), e.g. https://how.box/fr/math/shape-volume/?s=cuboid&a=4&b=3&c=2&u=m. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, geometry, volume, metric, imperial.
  - Agent tools: `shape_volume_calculate` (Volume and total surface area of a solid (CRC Standard Mathematical Tables §4.7–4.8; ellipsoid surface by Knud Thomsen's approximation, within 1.1 %).)
  - Preset [Volume d’une piscine](https://how.box/fr/math/pool/): Combien d’eau contient la piscine ? The same tool, preconfigured.
- [Conversion de pointures](https://how.box/fr/conversion/shoe-size/): À quelle pointure votre taille correspond-elle ? Comparer les pointures de référence pour adultes et enfants.
  - Addresses: en https://how.box/conversion/shoe-size/, en-us https://how.box/en-us/conversion/shoe-size/, fi https://how.box/fi/conversion/shoe-size/, de https://how.box/de/conversion/shoe-size/, es https://how.box/es/conversion/shoe-size/, fr https://how.box/fr/conversion/shoe-size/, sv https://how.box/sv/conversion/shoe-size/, it https://how.box/it/conversion/shoe-size/, et https://how.box/et/conversion/shoe-size/
  - Link to an answer: https://how.box/fr/conversion/shoe-size/?g={g}&s={s}&v={v} (g: men, women, kids, youth or infant; s: eu, uk, us, cm or mondopoint; v: text), e.g. https://how.box/fr/conversion/shoe-size/?g=men&s=eu&v=42. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, reference.
  - Agent tools: `shoe_size_convert` (Look up a shoe-size chart row for men, women, kids, youth or infants.)
- [Calcul des cycles de sommeil](https://how.box/fr/health/sleep/): Comment planifier votre sommeil ? Trouver des heures de coucher ou de réveil avec un cycle approximatif de 90 minutes.
  - Addresses: en https://how.box/health/sleep/, en-us https://how.box/en-us/health/sleep/, fi https://how.box/fi/health/sleep/, de https://how.box/de/health/sleep/, es https://how.box/es/health/sleep/, fr https://how.box/fr/health/sleep/, sv https://how.box/sv/health/sleep/, it https://how.box/it/health/sleep/, et https://how.box/et/health/sleep/
  - Link to an answer: https://how.box/fr/health/sleep/?mode={mode}&t={t}&l={l} (mode: wake or bed; t: text; l: whole number 0 to 120), e.g. https://how.box/fr/health/sleep/?mode=wake&t=07%3A00&l=15. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `sleep_calculate` (Plan bedtimes for a wake time (mode wake), or wake times for a bedtime (mode bed).)
- [Conversion de vitesse](https://how.box/fr/conversion/speed/): Combien vaut cette vitesse dans d’autres unités ? Convertir kilomètres par heure, miles par heure, mètres par seconde, nœuds et pieds par minute.
  - Addresses: en https://how.box/conversion/speed/, en-us https://how.box/en-us/conversion/speed/, fi https://how.box/fi/conversion/speed/, de https://how.box/de/conversion/speed/, es https://how.box/es/conversion/speed/, fr https://how.box/fr/conversion/speed/, sv https://how.box/sv/conversion/speed/, it https://how.box/it/conversion/speed/, et https://how.box/et/conversion/speed/
  - Link to an answer: https://how.box/fr/conversion/speed/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: ms, kmh, mph, kt or fpm; to: ms, kmh, mph, kt or fpm), e.g. https://how.box/fr/conversion/speed/?v=100&from=kmh&to=mph. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, speed, metric, imperial.
  - Agent tools: `speed_convert` (Converts a speed between units using exact definitions (1 km/h = 1/3.6 m/s, 1 mph = 1609.344/3600 m/s = 0.44704 m/s, 1 knot = 1852/3600 m/s, 1 ft/min = 0.3048/60 m/s; NIST SP 811 B.8, BIPM SI Brochure Table 8).)
  - Preset [Km/h en mph](https://how.box/fr/conversion/kmh-to-mph/): Combien de miles par heure valent 100 km/h ? The same tool, preconfigured.
- [Partager une addition](https://how.box/fr/everyday/split-bill/): Combien chacun doit-il payer ? Partager une addition en parts inégales, au centime près, en conservant toujours le total.
  - Addresses: en https://how.box/everyday/split-bill/, en-us https://how.box/en-us/everyday/split-bill/, fi https://how.box/fi/everyday/split-bill/, de https://how.box/de/everyday/split-bill/, es https://how.box/es/everyday/split-bill/, fr https://how.box/fr/everyday/split-bill/, sv https://how.box/sv/everyday/split-bill/, it https://how.box/it/everyday/split-bill/, et https://how.box/et/everyday/split-bill/
  - Link to an answer: https://how.box/fr/everyday/split-bill/?a={a}&c={c}&r={r} (a: number 0 to 1e7; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL; r: array), e.g. https://how.box/fr/everyday/split-bill/?a=100&c=EUR&r=%7E2%3Ap1_p2.2. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, costs, currency.
  - Agent tools: `split_bill_calculate` (Split one bill between 2–20 people by integer share weights.)
- [Codes transpondeur](https://how.box/fr/aviation/squawk/): Que signifie le code transpondeur 7700 ? Consulter les codes 7500, 7600 et 7700, ainsi que les codes VFR et IFR par pays, avec la règle qui définit chacun.
  - Addresses: en https://how.box/aviation/squawk/, en-us https://how.box/en-us/aviation/squawk/, fi https://how.box/fi/aviation/squawk/, de https://how.box/de/aviation/squawk/, es https://how.box/es/aviation/squawk/, fr https://how.box/fr/aviation/squawk/, sv https://how.box/sv/aviation/squawk/, it https://how.box/it/aviation/squawk/, et https://how.box/et/aviation/squawk/
  - Link to an answer: https://how.box/fr/aviation/squawk/?q={q}&w={w}&c={c} (q: text; w: (empty), eu, fi, ee, dk, se, fr, es, gb, us or ca; c: text), e.g. https://how.box/fr/aviation/squawk/?q=7700&w=fi&c=fi-7000. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, flight, encoding.
  - Agent tools: `squawk_code` (Explains a transponder (SSR Mode A) squawk code: 7700 emergency, 7600 radio failure, 7500 unlawful interference, and the VFR/IFR and special codes of the listed places.); `squawk_list` (Lists the squawk codes with a fixed meaning in a place (with the worldwide emergency codes), optionally narrowed by words or digits.)
- [Vérificateur de certificat SSL](https://how.box/fr/web/ssl/): Votre certificat SSL est-il valide et reconnu ? Expiration, émetteur, noms couverts, chaîne et version TLS d’un site public, avec des solutions claires.
  - Addresses: en https://how.box/web/ssl/, en-us https://how.box/en-us/web/ssl/, fi https://how.box/fi/web/ssl/, de https://how.box/de/web/ssl/, es https://how.box/es/web/ssl/, fr https://how.box/fr/web/ssl/, sv https://how.box/sv/web/ssl/, it https://how.box/it/web/ssl/, et https://how.box/et/web/ssl/
  - Link to an answer: https://how.box/fr/web/ssl/?h={h}&p={p} (h: text; p: 443, 465, 636, 853, 993, 995 or 8443), e.g. https://how.box/fr/web/ssl/?h=example.com&p=443. Served answer coverage: none (computed in the browser)
  - Uses our server; server limits: 20 requests/minute per visitor, 300 requests/day per visitor, 30 requests/minute per target. Tags: checker, network.
  - Agent tools: `ssl_check_certificate` (Checks the TLS certificate of a public host the way a browser does: one TLS handshake from our server to the first address the name resolves to (no data sent after the handshake).)
- [Atmosphère standard (ISA)](https://how.box/fr/aviation/standard-atmosphere/): Comment la température, la pression et la densité varient-elles avec l’altitude ? L’atmosphère standard OACI à toute altitude ou tout niveau de vol, par journée standard, plus chaude ou plus froide.
  - Addresses: en https://how.box/aviation/standard-atmosphere/, en-us https://how.box/en-us/aviation/standard-atmosphere/, fi https://how.box/fi/aviation/standard-atmosphere/, de https://how.box/de/aviation/standard-atmosphere/, es https://how.box/es/aviation/standard-atmosphere/, fr https://how.box/fr/aviation/standard-atmosphere/, sv https://how.box/sv/aviation/standard-atmosphere/, it https://how.box/it/aviation/standard-atmosphere/, et https://how.box/et/aviation/standard-atmosphere/
  - Link to an answer: https://how.box/fr/aviation/standard-atmosphere/?h={h}&u={u}&dt={dt} (h: number -16404 to 65616; u: ft, m or fl; dt: number -50 to 50), e.g. https://how.box/fr/aviation/standard-atmosphere/?h=35000&u=ft&dt=0. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, flight, temperature, weather.
  - Agent tools: `standard_atmosphere_calculate` (Computes the International Standard Atmosphere (ISO 2533 / ICAO Doc 7488: troposphere lapse 6.5 K/km to 11 km, isothermal −56.5 °C to 20 km; dry ideal gas) at a pressure altitude, optionally on a non-standard day ISA + isa_deviation (pressure stays that of the pressure altitude, temperature shifts, density and speed of sound follow).)
- [Calculateur d’écart type](https://how.box/fr/math/standard-deviation/): Quelle est la dispersion de ces nombres ? Écart type et variance d’une liste de nombres, pour un échantillon ou une population, avec la moyenne et l’erreur type.
  - Addresses: en https://how.box/math/standard-deviation/, en-us https://how.box/en-us/math/standard-deviation/, fi https://how.box/fi/math/standard-deviation/, de https://how.box/de/math/standard-deviation/, es https://how.box/es/math/standard-deviation/, fr https://how.box/fr/math/standard-deviation/, sv https://how.box/sv/math/standard-deviation/, it https://how.box/it/math/standard-deviation/, et https://how.box/et/math/standard-deviation/
  - Link to an answer: https://how.box/fr/math/standard-deviation/?v={v}&k={k} (v: text; k: sample or population), e.g. https://how.box/fr/math/standard-deviation/?v=2+4+4+4+5+5+7+9&k=sample. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, statistics.
  - Agent tools: `standard_deviation_calculate` (Standard deviation and variance of a list of numbers.)
- [Chronomètre](https://how.box/fr/datetime/stopwatch/): Combien de temps cela a-t-il pris ? Démarrer, marquer un tour, arrêter : tous les temps intermédiaires conservés.
  - Addresses: en https://how.box/datetime/stopwatch/, en-us https://how.box/en-us/datetime/stopwatch/, fi https://how.box/fi/datetime/stopwatch/, de https://how.box/de/datetime/stopwatch/, es https://how.box/es/datetime/stopwatch/, fr https://how.box/fr/datetime/stopwatch/, sv https://how.box/sv/datetime/stopwatch/, it https://how.box/it/datetime/stopwatch/, et https://how.box/et/datetime/stopwatch/
  - Link to an answer: https://how.box/fr/datetime/stopwatch/?f={f} (f: segments), e.g. https://how.box/fr/datetime/stopwatch/?f=segments. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, fitness.
  - Agent tools: none
- [Calculateur de remboursement de prêt étudiant](https://how.box/fr/finance/student-loan/): Combien allez-vous rembourser sur votre prêt étudiant ? Voyez la mensualité et le total des intérêts, avec la compensation et l’aide aux intérêts de la Kela finlandaise quand elles s’appliquent.
  - Addresses: en https://how.box/finance/student-loan/, en-us https://how.box/en-us/finance/student-loan/, fi https://how.box/fi/finance/student-loan/, de https://how.box/de/finance/student-loan/, es https://how.box/es/finance/student-loan/, fr https://how.box/fr/finance/student-loan/, sv https://how.box/sv/finance/student-loan/, it https://how.box/it/finance/student-loan/, et https://how.box/et/finance/student-loan/
  - Link to an answer: https://how.box/fr/finance/student-loan/?b={b}&r={r}&y={y}&fi={fi}&cr={cr}&ot={ot}&c={c} (b: number 0.01 to 1e6; r: number 0 to 30; y: whole number 1 to 30; fi: boolean; cr: 180, 210, 240, 270, 300, 330 or 360; ot: boolean; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL), e.g. https://how.box/fr/finance/student-loan/?b=20000&r=4&y=10&fi=1&cr=300&ot=1&c=EUR. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, loans, interest.
  - Agent tools: `student_loan_calculate` (Student loan repayment: equal monthly payments (annuity) at a fixed nominal annual rate over term_years.)
- [Lever et coucher du soleil](https://how.box/fr/datetime/sunrise/): Quand le soleil se lève-t-il et se couche-t-il ? Lever, coucher, midi solaire, durée du jour et crépuscules pour tout lieu et toute date, à partir des coordonnées.
  - Addresses: en https://how.box/datetime/sunrise/, en-us https://how.box/en-us/datetime/sunrise/, fi https://how.box/fi/datetime/sunrise/, de https://how.box/de/datetime/sunrise/, es https://how.box/es/datetime/sunrise/, fr https://how.box/fr/datetime/sunrise/, sv https://how.box/sv/datetime/sunrise/, it https://how.box/it/datetime/sunrise/, et https://how.box/et/datetime/sunrise/
  - Link to an answer: https://how.box/fr/datetime/sunrise/?lat={lat}&lon={lon}&d={d}&z={z} (lat: text; lon: text; d: text; z: text), e.g. https://how.box/fr/datetime/sunrise/?lat=60.17&lon=24.94&d=2026-06-21&z=Europe%2FHelsinki. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, reference.
  - Agent tools: `sunrise_calculate` (Sunrise, sunset, solar noon, day length and civil, nautical and astronomical twilight for a place and a date (NOAA solar calculator equations; about a minute accurate between latitudes ±72°, no terrain or weather).)
- [Synthétiseur](https://how.box/fr/music/synth/): Comment votre mélodie sonnerait-elle au synthétiseur ? Jouez et façonnez le son : onde, enveloppe, filtre et LFO. Utilisez la souris, le tactile, le clavier de l’ordinateur ou un clavier MIDI.
  - Addresses: en https://how.box/music/synth/, en-us https://how.box/en-us/music/synth/, fi https://how.box/fi/music/synth/, de https://how.box/de/music/synth/, es https://how.box/es/music/synth/, fr https://how.box/fr/music/synth/, sv https://how.box/sv/music/synth/, it https://how.box/it/music/synth/, et https://how.box/et/music/synth/
  - Link to an answer: https://how.box/fr/music/synth/?v={v}&o={o}&n={n}&w={w}&dt={dt}&at={at}&dc={dc}&su={su}&re={re}&cu={cu}&rs={rs}&fe={fe}&lr={lr}&ld={ld}&lt={lt} (v: synth, piano, organ, marimba, xylophone or toy-piano; o: whole number 1 to 6; n: whole number 0 to 127; w: sine, triangle, sawtooth or square; dt: whole number 0 to 50; at: whole number 3 to 4000; dc: whole number 10 to 4000; su: whole number 0 to 100; re: whole number 20 to 6000; cu: whole number 40 to 18000; rs: whole number 0 to 20; fe: number 0 to 4; lr: number 0.1 to 20; ld: whole number 0 to 100; lt: pitch, filter or amplitude), e.g. https://how.box/fr/music/synth/?v=piano&o=3&n=69&w=square&dt=12&at=400&dc=300&su=60&re=800&cu=900&rs=6&fe=2&lr=5&ld=30&lt=amplitude. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: sound.
  - Agent tools: `synth_note` (Looks up a note on the synth keyboard: its names, frequency and the computer key that plays it.); `synth_sound` (Sets the synth sound and describes it: subtractive synthesis (oscillator waveform, optional detuned second oscillator, low-pass filter with an envelope, ADSR amplitude envelope, LFO).)
- [Calculateur de CO₂ à l’échappement](https://how.box/fr/vehicles/tailpipe-co2/): Combien de CO₂ votre voiture émet-elle ? Grammes de CO₂ par kilomètre ou par mile, et kilos par an, selon ce que consomme votre voiture essence ou diesel.
  - Addresses: en https://how.box/vehicles/tailpipe-co2/, en-us https://how.box/en-us/vehicles/tailpipe-co2/, fi https://how.box/fi/vehicles/tailpipe-co2/, de https://how.box/de/vehicles/tailpipe-co2/, es https://how.box/es/vehicles/tailpipe-co2/, fr https://how.box/fr/vehicles/tailpipe-co2/, sv https://how.box/sv/vehicles/tailpipe-co2/, it https://how.box/it/vehicles/tailpipe-co2/, et https://how.box/et/vehicles/tailpipe-co2/
  - Link to an answer: https://how.box/fr/vehicles/tailpipe-co2/?f={f}&c={c}&cu={cu}&d={d}&du={du} (f: petrol or diesel; c: number 0.1 to 1000; cu: l_100km, km_l, mpg_us or mpg_imp; d: number 0 to 1e6; du: km or mi), e.g. https://how.box/fr/vehicles/tailpipe-co2/?f=petrol&c=6.5&cu=l_100km&d=15000&du=km. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, energy, distance.
  - Agent tools: `tailpipe_co2_calculate` (Tailpipe CO₂ of a petrol or diesel car from its fuel consumption.)
- [Convertisseur de température](https://how.box/fr/conversion/temperature/): Quelle température cela donne-t-il sur d’autres échelles ? Celsius, Fahrenheit, kelvin, Rankine et réglages gas mark des fours, avec exactitude.
  - Addresses: en https://how.box/conversion/temperature/, en-us https://how.box/en-us/conversion/temperature/, fi https://how.box/fi/conversion/temperature/, de https://how.box/de/conversion/temperature/, es https://how.box/es/conversion/temperature/, fr https://how.box/fr/conversion/temperature/, sv https://how.box/sv/conversion/temperature/, it https://how.box/it/conversion/temperature/, et https://how.box/et/conversion/temperature/
  - Link to an answer: https://how.box/fr/conversion/temperature/?v={v}&from={from}&to={to} (v: number -1e12 to 1e12; from: c, f, k or r; to: c, f, k or r), e.g. https://how.box/fr/conversion/temperature/?v=350&from=f&to=c. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, temperature, metric, imperial.
  - Agent tools: `temperature_convert` (Converts a temperature between degrees Celsius (c), degrees Fahrenheit (f), kelvins (k) and degrees Rankine (r) using the exact definitions (°F = °C × 9/5 + 32, K = °C + 273.15, °R = K × 9/5; NIST SP 811).); `temperature_gas_mark` (Gives the oven temperature of a UK gas mark: ¼ = 225 °F, ½ = 250 °F, mark n = 250 + 25·n °F for 1–10.)
  - Preset [Celsius en Fahrenheit](https://how.box/fr/conversion/celsius-to-fahrenheit/): Comment convertir des Celsius en Fahrenheit ? The same tool, preconfigured.
  - Preset [Fahrenheit en Celsius](https://how.box/fr/conversion/fahrenheit-to-celsius/): Comment convertir des Fahrenheit en Celsius ? The same tool, preconfigured.
- [Comparateur de textes](https://how.box/fr/text/text-diff/): Qu’est-ce qui a changé ? Ajouts et suppressions, ligne par ligne ou mot par mot.
  - Addresses: en https://how.box/text/text-diff/, en-us https://how.box/en-us/text/text-diff/, fi https://how.box/fi/text/text-diff/, de https://how.box/de/text/text-diff/, es https://how.box/es/text/text-diff/, fr https://how.box/fr/text/text-diff/, sv https://how.box/sv/text/text-diff/, it https://how.box/it/text/text-diff/, et https://how.box/et/text/text-diff/
  - Link to an answer: https://how.box/fr/text/text-diff/?mode={mode}&case={case}&space={space} (mode: lines or words; case: boolean; space: boolean), e.g. https://how.box/fr/text/text-diff/?mode=lines&case=0&space=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker.
  - Agent tools: `text_diff_compare` (Compare original and revised text (12000 characters each) by lines or whitespace-separated words.)
- [Calculateur de carrelage](https://how.box/fr/everyday/tiles/): Combien de carreaux me faut-il ? Carreaux et cartons, paquets de revêtement de sol ou rouleaux de papier peint pour un sol ou un mur, avec une marge pour les coupes et les chutes.
  - Addresses: en https://how.box/everyday/tiles/, en-us https://how.box/en-us/everyday/tiles/, fi https://how.box/fi/everyday/tiles/, de https://how.box/de/everyday/tiles/, es https://how.box/es/everyday/tiles/, fr https://how.box/fr/everyday/tiles/, sv https://how.box/sv/everyday/tiles/, it https://how.box/it/everyday/tiles/, et https://how.box/et/everyday/tiles/
  - Link to an answer: https://how.box/fr/everyday/tiles/?k={k}&l={l}&w={w}&u={u}&x={x}&tl={tl}&tw={tw}&b={b}&p={p}&pu={pu}&rw={rw}&rl={rl}&r={r}&su={su} (k: tiles, flooring or wallpaper; l: number 0.01 to 1000; w: number 0.01 to 1000; u: m, cm, ft or in; x: number 0 to 50; tl: number 0.001 to 10; tw: number 0.001 to 10; b: whole number 1 to 1000; p: number 0.01 to 100; pu: m2 or ft2; rw: number 0.001 to 10; rl: number 0.1 to 100; r: number 0 to 2; su: cm, mm or in), e.g. https://how.box/fr/everyday/tiles/?k=tiles&l=4&w=3&u=m&x=10&tl=0.3&tw=0.3&b=10&p=2&pu=m2&rw=0.53&rl=10.05&r=0&su=cm. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, area, metric, imperial.
  - Agent tools: `tiles_estimate` (Tiles, flooring packs or wallpaper rolls for a surface, with a waste allowance, rounded up.)
  - Preset [Calculateur de revêtement de sol](https://how.box/fr/everyday/flooring/): Combien de revêtement de sol me faut-il ? The same tool, preconfigured.
  - Preset [Calculateur de papier peint](https://how.box/fr/everyday/wallpaper/): Combien de rouleaux de papier peint me faut-il ? The same tool, preconfigured.
- [Minuteur](https://how.box/fr/datetime/timer/): Combien de temps reste-t-il ? Un peu de temps, clairement décompté.
  - Addresses: en https://how.box/datetime/timer/, en-us https://how.box/en-us/datetime/timer/, fi https://how.box/fi/datetime/timer/, de https://how.box/de/datetime/timer/, es https://how.box/es/datetime/timer/, fr https://how.box/fr/datetime/timer/, sv https://how.box/sv/datetime/timer/, it https://how.box/it/datetime/timer/, et https://how.box/et/datetime/timer/
  - Link to an answer: https://how.box/fr/datetime/timer/?d={d}&f={f} (d: whole number 1000 to 3.59999e8; f: segments), e.g. https://how.box/fr/datetime/timer/?d=359999000&f=segments. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, sound.
  - Agent tools: `timer_describe_duration` (Describe a duration of 1 second to 99 hours, 59 minutes and 59 seconds.)
  - Preset [Minuteur pour œufs](https://how.box/fr/datetime/egg-timer/): Combien de temps faut-il cuire un œuf ? The same tool, preconfigured.
- [Réviser les tables de multiplication](https://how.box/fr/kids/times-tables/): Connaissez-vous bien vos tables de multiplication ? Choisissez vos tables. Prenez votre temps, réessayez et découvrez celles que vous connaissez.
  - Addresses: en https://how.box/kids/times-tables/, en-us https://how.box/en-us/kids/times-tables/, fi https://how.box/fi/kids/times-tables/, de https://how.box/de/kids/times-tables/, es https://how.box/es/kids/times-tables/, fr https://how.box/fr/kids/times-tables/, sv https://how.box/sv/kids/times-tables/, it https://how.box/it/kids/times-tables/, et https://how.box/et/kids/times-tables/
  - Link to an answer: https://how.box/fr/kids/times-tables/?n={n} (n: text), e.g. https://how.box/fr/kids/times-tables/?n=2%2C3%2C4%2C5. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: practice.
  - Agent tools: none
- [Convertisseur de fuseaux horaires](https://how.box/fr/datetime/timezone/): Quelle heure est-il là-bas quand il est telle heure ici ? Une heure convertie dans plusieurs fuseaux horaires à la fois, avec la date, le décalage et l’heure d’été ce jour-là.
  - Addresses: en https://how.box/datetime/timezone/, en-us https://how.box/en-us/datetime/timezone/, fi https://how.box/fi/datetime/timezone/, de https://how.box/de/datetime/timezone/, es https://how.box/es/datetime/timezone/, fr https://how.box/fr/datetime/timezone/, sv https://how.box/sv/datetime/timezone/, it https://how.box/it/datetime/timezone/, et https://how.box/et/datetime/timezone/
  - Link to an answer: https://how.box/fr/datetime/timezone/?view={view}&from={from}&t={t}&day={day}&z={z}&q={q} (view: convert or list; from: text; t: text; day: text; z: text; q: text), e.g. https://how.box/fr/datetime/timezone/?view=convert&from=Europe%2FHelsinki&t=14%3A30&day=2026-10-21&z=America%2FNew_York%2CAsia%2FTokyo&q=europe. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, reference.
  - Agent tools: `timezone_convert` (Convert a wall-clock time in one IANA time zone to other time zones, with daylight saving time from the browser's time-zone database; or list time zones with their offsets.)
  - Preset [Décalage horaire](https://how.box/fr/datetime/time-difference/): Combien d’heures de décalage y a-t-il entre deux lieux ? The same tool, preconfigured.
  - Preset [Liste des fuseaux horaires](https://how.box/fr/datetime/tz-list/): Quel est le décalage UTC de chaque fuseau horaire ? The same tool, preconfigured.
- [Calculateur de pourboire](https://how.box/fr/everyday/tip/): Combien laisser de pourboire et combien paie chacun ? Ajoutez un pourboire à l’addition et partagez le total, au centime près.
  - Addresses: en https://how.box/everyday/tip/, en-us https://how.box/en-us/everyday/tip/, fi https://how.box/fi/everyday/tip/, de https://how.box/de/everyday/tip/, es https://how.box/es/everyday/tip/, fr https://how.box/fr/everyday/tip/, sv https://how.box/sv/everyday/tip/, it https://how.box/it/everyday/tip/, et https://how.box/et/everyday/tip/
  - Link to an answer: https://how.box/fr/everyday/tip/?a={a}&c={c}&t={t}&n={n} (a: number 0 to 1e7; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL; t: number 0 to 100; n: whole number 1 to 100), e.g. https://how.box/fr/everyday/tip/?a=50&c=EUR&t=10&n=2. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, costs, currency.
  - Agent tools: `tip_calculate` (Add a tip to a bill and split the total evenly.)
- [Pourboires par pays](https://how.box/fr/everyday/tipping/): Combien laisser de pourboire dans un autre pays ? Les usages du pourboire au restaurant, en taxi et à l’hôtel par pays, d’après les sites touristiques officiels, avec le pourboire et le total de votre addition.
  - Addresses: en https://how.box/everyday/tipping/, en-us https://how.box/en-us/everyday/tipping/, fi https://how.box/fi/everyday/tipping/, de https://how.box/de/everyday/tipping/, es https://how.box/es/everyday/tipping/, fr https://how.box/fr/everyday/tipping/, sv https://how.box/sv/everyday/tipping/, it https://how.box/it/everyday/tipping/, et https://how.box/et/everyday/tipping/
  - Link to an answer: https://how.box/fr/everyday/tipping/?c={c}&s={s}&a={a} (c: AU, DE, DK, EE, ES, FI, FR, GB, GR, HU, IT, JP, NL, NO, NZ, SE, SG or ZA; s: restaurant, taxi or hotel; a: number 0 to 1e7), e.g. https://how.box/fr/everyday/tipping/?c=FR&s=restaurant&a=50. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, reference, costs.
  - Agent tools: `tipping_calculate` (Looks up the tipping custom of a country for a restaurant, taxi or hotel, as its national tourism board or government page states it, and suggests the tip on a bill.)
- [Générateur de sons](https://how.box/fr/physics/tone/): Comment sonne cette fréquence ? Jouez un son de 1 Hz à 20 kHz : note, période et longueur d’onde.
  - Addresses: en https://how.box/physics/tone/, en-us https://how.box/en-us/physics/tone/, fi https://how.box/fi/physics/tone/, de https://how.box/de/physics/tone/, es https://how.box/es/physics/tone/, fr https://how.box/fr/physics/tone/, sv https://how.box/sv/physics/tone/, it https://how.box/it/physics/tone/, et https://how.box/et/physics/tone/
  - Link to an answer: https://how.box/fr/physics/tone/?f={f}&w={w}&a4={a4}&m={m}&e={e}&s={s}&c={c} (f: number 1 to 20000; w: sine, square, triangle or sawtooth; a4: number 400 to 480; m: tone or sweep; e: number 1 to 20000; s: number 0.1 to 300; c: linear or logarithmic), e.g. https://how.box/fr/physics/tone/?f=440&w=sine&a4=440&m=tone&e=2000&s=5&c=logarithmic. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, sound, frequency.
  - Agent tools: `tone_describe_frequency` (Describes a sound frequency: its period, its wavelength in air, and the nearest musical note with the offset in cents.); `tone_note_to_frequency` (Gives the frequency of a musical note in twelve-tone equal temperament.)
- [Convertisseur de couple](https://how.box/fr/conversion/torque/): Combien fait ce couple dans d’autres unités ? Convertissez entre newtons-mètres, livres-pieds, livres-pouces, kilogrammes-force mètres et autres unités.
  - Addresses: en https://how.box/conversion/torque/, en-us https://how.box/en-us/conversion/torque/, fi https://how.box/fi/conversion/torque/, de https://how.box/de/conversion/torque/, es https://how.box/es/conversion/torque/, fr https://how.box/fr/conversion/torque/, sv https://how.box/sv/conversion/torque/, it https://how.box/it/conversion/torque/, et https://how.box/et/conversion/torque/
  - Link to an answer: https://how.box/fr/conversion/torque/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: nm, knm, ncm, kgfm, lbfft, lbfin, ozfin or dyncm; to: nm, knm, ncm, kgfm, lbfft, lbfin, ozfin or dyncm), e.g. https://how.box/fr/conversion/torque/?v=100&from=nm&to=lbfft. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, metric, imperial.
  - Agent tools: `torque_convert` (Converts a torque between units using exact definitions (1 kgf·m = 9.80665 N·m, 1 lbf·ft = 0.45359237 × 9.80665 × 0.3048 N·m ≈ 1.355818 N·m, 1 lbf·in ≈ 0.1129848 N·m, 1 ozf·in ≈ 0.007061552 N·m, 1 N·cm = 0.01 N·m, 1 dyn·cm = 1e-7 N·m; NIST SP 811 B.9).)
  - Preset [Newtons-mètres en livres-pieds](https://how.box/fr/conversion/nm-to-ft-lb/): Combien de livres-pieds fait un newton-mètre ? The same tool, preconfigured.
- [Piano jouet](https://how.box/fr/kids/toy-piano/): Et si vous jouiez une chanson au piano jouet ? De grandes touches colorées, des sons de piano jouet, xylophone et marimba, et des chansons dont la prochaine touche s’éclaire.
  - Addresses: en https://how.box/kids/toy-piano/, en-us https://how.box/en-us/kids/toy-piano/, fi https://how.box/fi/kids/toy-piano/, de https://how.box/de/kids/toy-piano/, es https://how.box/es/kids/toy-piano/, fr https://how.box/fr/kids/toy-piano/, sv https://how.box/sv/kids/toy-piano/, it https://how.box/it/kids/toy-piano/, et https://how.box/et/kids/toy-piano/
  - Link to an answer: https://how.box/fr/kids/toy-piano/?s={s}&k={k}&song={song} (s: toy-piano, xylophone or marimba; k: letters, colors or plain; song: none, twinkle, frere-jacques or hare), e.g. https://how.box/fr/kids/toy-piano/?s=xylophone&k=letters&song=twinkle. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: sound.
  - Agent tools: `toy_piano_songs` (Lists the play-along songs of the toy piano: id, English title, number of notes and the source of the public-domain melody.); `toy_piano_song_notes` (Gives the melody of one play-along song as note names (scientific pitch notation, C4 = middle C, "Bb4" = B flat) and MIDI numbers, one per key press.)
- [Calculateur de droits de mutation](https://how.box/fr/finance/transfer-tax/): Combien de droits de mutation payez-vous sur un logement en Finlande ? Les droits de mutation finlandais sur un appartement, un bien immobilier ou des actions, aux taux en vigueur à la date de votre contrat.
  - Addresses: en https://how.box/finance/transfer-tax/, en-us https://how.box/en-us/finance/transfer-tax/, fi https://how.box/fi/finance/transfer-tax/, de https://how.box/de/finance/transfer-tax/, es https://how.box/es/finance/transfer-tax/, fr https://how.box/fr/finance/transfer-tax/, sv https://how.box/sv/finance/transfer-tax/, it https://how.box/it/finance/transfer-tax/, et https://how.box/et/finance/transfer-tax/
  - Link to an answer: https://how.box/fr/finance/transfer-tax/?a={a}&p={p}&l={l}&d={d}&fh={fh} (a: housing_shares, property or other_securities; p: number 0 to 1e9; l: number 0 to 1e9; d: text; fh: boolean), e.g. https://how.box/fr/finance/transfer-tax/?a=property&p=60000&l=20000&d=2023-10-11&fh=1. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, tax, housing. Countries: FI (Finlande).
  - Agent tools: `transfer_tax_calculate` (Finland only: the transfer tax (varainsiirtovero) one buyer pays, by Varainsiirtoverolaki 931/1996 and the contract date.)
- [Résolution de triangles](https://how.box/fr/math/triangle/): Comment résoudre un triangle ? Donnez trois éléments d’un triangle et obtenez les trois autres, son aire et un dessin à l’échelle, y compris quand deux solutions existent.
  - Addresses: en https://how.box/math/triangle/, en-us https://how.box/en-us/math/triangle/, fi https://how.box/fi/math/triangle/, de https://how.box/de/math/triangle/, es https://how.box/es/math/triangle/, fr https://how.box/fr/math/triangle/, sv https://how.box/sv/math/triangle/, it https://how.box/it/math/triangle/, et https://how.box/et/math/triangle/
  - Link to an answer: https://how.box/fr/math/triangle/?k={k}&a={a}&b={b}&c={c}&aa={aa}&ab={ab}&ac={ac}&u={u}&au={au} (k: sss, sas, asa, aas or ssa; a: number 0.000001 to 1e6; b: number 0.000001 to 1e6; c: number 0.000001 to 1e6; aa: number 0 to 3.141592653589793; ab: number 0 to 3.141592653589793; ac: number 0 to 3.141592653589793; u: mm, cm, m, in, ft or yd; au: deg or rad), e.g. https://how.box/fr/math/triangle/?k=sss&a=3&b=4&c=5&aa=0.5235987755982988&ab=0.7853981633974483&ac=1.0471975511965976&u=m&au=deg. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, geometry, length.
  - Agent tools: `triangle_solve` (Solves a triangle from three known parts by the laws of sines and cosines (OpenStax Precalculus 2e §8.1–8.2).)
- [Accordeur](https://how.box/fr/music/tuner/): Votre instrument est-il accordé ? Jouez une note près du microphone pour voir la note la plus proche, l’écart en cents et la fréquence. Le son reste sur votre appareil.
  - Addresses: en https://how.box/music/tuner/, en-us https://how.box/en-us/music/tuner/, fi https://how.box/fi/music/tuner/, de https://how.box/de/music/tuner/, es https://how.box/es/music/tuner/, fr https://how.box/fr/music/tuner/, sv https://how.box/sv/music/tuner/, it https://how.box/it/music/tuner/, et https://how.box/et/music/tuner/
  - Link to an answer: https://how.box/fr/music/tuner/?i={i}&a={a} (i: chromatic, guitar, bass, ukulele or violin; a: number 400 to 480), e.g. https://how.box/fr/music/tuner/?i=guitar&a=442. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker, sound, frequency.
  - Agent tools: `tuner_describe_pitch` (Describes what an instrument tuner shows for a pitch: the nearest note, how many cents sharp (+) or flat (−) it is and whether it is in tune (within 5 cents).)
- [Test de frappe](https://how.box/fr/text/typing-test/): À quelle vitesse tapez-vous ? Votre vitesse de frappe en mots par minute, votre précision et les touches que vous manquez le plus.
  - Addresses: en https://how.box/text/typing-test/, en-us https://how.box/en-us/text/typing-test/, fi https://how.box/fi/text/typing-test/, de https://how.box/de/text/typing-test/, es https://how.box/es/text/typing-test/, fr https://how.box/fr/text/typing-test/, sv https://how.box/sv/text/typing-test/, it https://how.box/it/text/typing-test/, et https://how.box/et/text/typing-test/
  - Link to an answer: https://how.box/fr/text/typing-test/?m={m}&t={t}&w={w}&l={l}&s={s} (m: time or words; t: 15, 30, 60 or 120; w: 10, 25, 50 or 100; l: en, fi, de, es, fr, sv, it or et; s: whole number 0 to 9.99999999e8), e.g. https://how.box/fr/text/typing-test/?m=time&t=60&w=25&l=en&s=4242. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: practice, checker.
  - Agent tools: `typing_test_passage` (Returns the passage of a typing test: common words of the chosen language, picked from a fixed word list by a seed.); `typing_test_score` (Scores text typed against a typing-test passage.)
- [Comparateur de prix unitaire](https://how.box/fr/finance/unit-price/): Comment trouver le paquet le moins cher au kilo ou au litre ? Comparez des conditionnements de tailles différentes par leur prix au kilogramme, au litre ou à la pièce.
  - Addresses: en https://how.box/finance/unit-price/, en-us https://how.box/en-us/finance/unit-price/, fi https://how.box/fi/finance/unit-price/, de https://how.box/de/finance/unit-price/, es https://how.box/es/finance/unit-price/, fr https://how.box/fr/finance/unit-price/, sv https://how.box/sv/finance/unit-price/, it https://how.box/it/finance/unit-price/, et https://how.box/et/finance/unit-price/
  - Link to an answer: https://how.box/fr/finance/unit-price/?k={k}&c={c}&r={r} (k: mass, volume or count; c: AED, AFN, ALL, AMD, ANG, AOA, ARS, AUD, AWG, AZN, BAM, BBD, BDT, BGN, BHD, BIF, BMD, BND, BOB, BRL, BSD, BTN, BWP, BYN, BZD, CAD, CDF, CHF, CLF, CLP, CNY, COP, CRC, CUC, CUP, CVE, CZK, DJF, DKK, DOP, DZD, EGP, ERN, ETB, EUR, FJD, FKP, GBP, GEL, GHS, GIP, GMD, GNF, GTQ, GYD, HKD, HNL, HRK, HTG, HUF, IDR, ILS, INR, IQD, IRR, ISK, JMD, JOD, JPY, KES, KGS, KHR, KMF, KPW, KRW, KWD, KYD, KZT, LAK, LBP, LKR, LRD, LSL, LYD, MAD, MDL, MGA, MKD, MMK, MNT, MOP, MRU, MUR, MVR, MWK, MXN, MYR, MZN, NAD, NGN, NIO, NOK, NPR, NZD, OMR, PAB, PEN, PGK, PHP, PKR, PLN, PYG, QAR, RON, RSD, RUB, RWF, SAR, SBD, SCR, SDG, SEK, SGD, SHP, SLE, SLL, SOS, SRD, SSP, STN, SVC, SYP, SZL, THB, TJS, TMT, TND, TOP, TRY, TTD, TWD, TZS, UAH, UGX, USD, UYU, UYW, UZS, VES, VND, VUV, WST, XAF, XCD, XCG, XDR, XOF, XPF, XSU, YER, ZAR, ZMW, ZWG or ZWL; r: array), e.g. https://how.box/fr/finance/unit-price/?k=mass&c=EUR&r=%7E1%3A2.5%3A500%3Ag%2C4.5%3A1%3Akg. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, costs, weight, volume.
  - Agent tools: `unit_price_compare` (Compare 2–6 offers by price per kilogram, litre or piece.)
- [Convertisseur d’horodatage Unix](https://how.box/fr/datetime/unix-time/): Comment convertir un horodatage Unix en date ? Convertissez un horodatage Unix en date et une date en horodatage, dans tout fuseau horaire.
  - Addresses: en https://how.box/datetime/unix-time/, en-us https://how.box/en-us/datetime/unix-time/, fi https://how.box/fi/datetime/unix-time/, de https://how.box/de/datetime/unix-time/, es https://how.box/es/datetime/unix-time/, fr https://how.box/fr/datetime/unix-time/, sv https://how.box/sv/datetime/unix-time/, it https://how.box/it/datetime/unix-time/, et https://how.box/et/datetime/unix-time/
  - Link to an answer: https://how.box/fr/datetime/unix-time/?d={d}&ts={ts}&u={u}&day={day}&t={t}&z={z} (d: to_date or to_timestamp; ts: text; u: seconds or milliseconds; day: text; t: text; z: text), e.g. https://how.box/fr/datetime/unix-time/?d=to_date&ts=1700000000&u=seconds&day=2026-10-15&t=14%3A30%3A00&z=UTC. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, calculator.
  - Agent tools: `unix_time_convert` (Converts between a Unix timestamp (seconds or milliseconds since 1970-01-01T00:00:00Z, leap seconds not counted) and a date and time in an IANA time zone, with daylight saving time from the browser's time-zone database.)
- [Encoder et décoder une URL](https://how.box/fr/web/url-encode/): Comment encoder du texte pour une adresse web ? Encodez du texte pour une adresse web avec des codes %, ou redonnez à %20 et ses semblables leur forme lisible.
  - Addresses: en https://how.box/web/url-encode/, en-us https://how.box/en-us/web/url-encode/, fi https://how.box/fi/web/url-encode/, de https://how.box/de/web/url-encode/, es https://how.box/es/web/url-encode/, fr https://how.box/fr/web/url-encode/, sv https://how.box/sv/web/url-encode/, it https://how.box/it/web/url-encode/, et https://how.box/et/web/url-encode/
  - Link to an answer: https://how.box/fr/web/url-encode/?dir={dir}&scope={scope}&text={text} (dir: encode or decode; scope: component, full or form; text: text), e.g. https://how.box/fr/web/url-encode/?dir=encode&scope=component&text=Hello+world+%26+caf%C3%A9%3F. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: converter, encoding.
  - Agent tools: `url_encode_convert` (Percent-encodes text for use in a web address, or decodes percent-encoded text (RFC 3986 §2.1, UTF-8).)
- [Générateur d’UUID](https://how.box/fr/web/uuid/): Comment créer un nouvel UUID ? UUID aléatoires, version 4 ou version 7 ordonnée par date, créés sur votre appareil.
  - Addresses: en https://how.box/web/uuid/, en-us https://how.box/en-us/web/uuid/, fi https://how.box/fi/web/uuid/, de https://how.box/de/web/uuid/, es https://how.box/es/web/uuid/, fr https://how.box/fr/web/uuid/, sv https://how.box/sv/web/uuid/, it https://how.box/it/web/uuid/, et https://how.box/et/web/uuid/
  - Link to an answer: https://how.box/fr/web/uuid/?ver={ver}&n={n}&upper={upper}&braces={braces} (ver: v4 or v7; n: whole number 1 to 100; upper: boolean; braces: boolean), e.g. https://how.box/fr/web/uuid/?ver=v4&n=1&upper=0&braces=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, encoding.
  - Agent tools: `uuid_generate` (Generates UUIDs as in RFC 9562 with the browser's cryptographically secure random generator: version 4 (122 random bits) or version 7 (Unix millisecond timestamp plus random bits, sortable by creation time).)
- [Calculateur de TVA](https://how.box/fr/finance/vat/): Combien de TVA contient un prix ? Ajoutez la TVA à un prix ou retirez-la, avec les taux normaux et réduits de votre pays.
  - Addresses: en https://how.box/finance/vat/, en-us https://how.box/en-us/finance/vat/, fi https://how.box/fi/finance/vat/, de https://how.box/de/finance/vat/, es https://how.box/es/finance/vat/, fr https://how.box/fr/finance/vat/, sv https://how.box/sv/finance/vat/, it https://how.box/it/finance/vat/, et https://how.box/et/finance/vat/
  - Link to an answer: https://how.box/fr/finance/vat/?c={c}&r={r}&a={a}&d={d} (c: (empty), AD, AE, AL, AT, BA, BB, BE, BG, BS, BT, CA, CD, CH, CK, CL, CN, CY, CZ, DE, DK, DM, EE, ES, FI, FJ, FR, GA, GB, GH, GL, GM, GR, GY, HK, HR, HU, IE, IM, IS, IT, JP, KE, KH, KR, LI, LT, LU, LV, MC, MD, ME, MK, MT, MU, MV, NA, NC, NL, NO, NP, NZ, OM, PA, PE, PF, PL, PT, PW, PY, QA, RO, RS, SC, SE, SG, SI, SK, SN, SR, TH, TM, TT, TW, UG, US, UY, VC, VU, WS, ZA or ZW; r: number 0 to 100; a: number 0 to 1e12; d: add or remove), e.g. https://how.box/fr/finance/vat/?c=FI&r=25.5&a=100&d=add. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, tax, costs.
  - Agent tools: `vat_rates` (Look up a country's VAT/GST rates: the standard rate and reduced rates in percent, with the categories a reduced rate covers where the official source says so (EU: European Commission TEDB categories; applies_to lists only some goods and services of each category, not every item).); `vat_calculate` (Add VAT to a net price (direction add: VAT = amount × rate / 100) or take it out of a gross price (direction remove: VAT = amount × rate / (100 + rate)).)
  - Preset [Calculateur de TVA britannique](https://how.box/fr/finance/uk-vat/): Combien de TVA contient un prix au Royaume-Uni ? The same tool, preconfigured.
  - Preset [Calculateur de TVA autrichienne](https://how.box/fr/finance/austria-vat/): Combien de TVA contient un prix en Autriche ? The same tool, preconfigured.
  - Preset [Calculateur de TVA suisse](https://how.box/fr/finance/swiss-vat/): Combien de TVA contient un prix en Suisse ? The same tool, preconfigured.
- [Convertisseur de volume](https://how.box/fr/conversion/volume/): Combien cela vaut-il dans d’autres unités de volume ? Convertissez exactement millilitres, litres, mètres cubes, gallons américains et gallons impériaux.
  - Addresses: en https://how.box/conversion/volume/, en-us https://how.box/en-us/conversion/volume/, fi https://how.box/fi/conversion/volume/, de https://how.box/de/conversion/volume/, es https://how.box/es/conversion/volume/, fr https://how.box/fr/conversion/volume/, sv https://how.box/sv/conversion/volume/, it https://how.box/it/conversion/volume/, et https://how.box/et/conversion/volume/
  - Link to an answer: https://how.box/fr/conversion/volume/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: ml, cl, l, m3, us_floz, us_pt, us_qt, us_gal, imp_floz, imp_pt, imp_gal, mm3, cm3, in3, ft3 or yd3; to: ml, cl, l, m3, us_floz, us_pt, us_qt, us_gal, imp_floz, imp_pt, imp_gal, mm3, cm3, in3, ft3 or yd3), e.g. https://how.box/fr/conversion/volume/?v=1&from=l&to=us_gal. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, volume, metric, imperial.
  - Agent tools: `volume_convert` (Converts a volume between units using exact definitions (1 L = 0.001 m³, 1 mL = 0.001 L, US liquid gallon = 231 in³ = 3.785411784 L, imperial gallon = 4.54609 L; US quart, pint and fluid ounce = 1/4, 1/8 and 1/128 US gallon; imperial pint and fluid ounce = 1/8 and 1/160 imperial gallon; cubic mm, cm, inch, foot and yard as the cubes of their lengths; NIST SP 811 B.8, UK Weights and Measures Act 1985 Sch.)
  - Preset [Litres en gallons américains](https://how.box/fr/conversion/litres-to-gallons/): Combien de gallons américains vaut un litre ? The same tool, preconfigured.
- [Rapport tour de taille/taille](https://how.box/fr/health/waist-height/): Votre tour de taille fait-il moins de la moitié de votre taille ? Votre rapport tour de taille/taille et ce qu’il dit de la graisse abdominale, avec les catégories du NICE et la règle de la moitié de la taille.
  - Addresses: en https://how.box/health/waist-height/, en-us https://how.box/en-us/health/waist-height/, fi https://how.box/fi/health/waist-height/, de https://how.box/de/health/waist-height/, es https://how.box/es/health/waist-height/, fr https://how.box/fr/health/waist-height/, sv https://how.box/sv/health/waist-height/, it https://how.box/it/health/waist-height/, et https://how.box/et/health/waist-height/
  - Link to an answer: https://how.box/fr/health/waist-height/?u={u}&h={h}&w={w}&ft={ft}&in={in}&lb={lb}&wa={wa}&wi={wi} (u: metric or us; h: number 120 to 230; w: number 30 to 300; ft: whole number 4 to 7; in: number 0 to 11.9; lb: number 66 to 660; wa: number 40 to 200; wi: number 16 to 80), e.g. https://how.box/fr/health/waist-height/?u=metric&h=175&w=70&ft=5&in=9&lb=155&wa=80&wi=31.5. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, fitness, length.
  - Agent tools: `waist_height_calculate` (Waist-to-height ratio of an adult (waist ÷ height, same unit) and its NICE NG246 category, judged on the ratio rounded to two decimals: "healthy" 0.40–0.49, "increased" 0.50–0.59, "high" ≥ 0.60 central adiposity, "below" under 0.40 (outside NICE's bands).)
- [Test de webcam](https://how.box/fr/media/webcam-test/): Ma webcam fonctionne-t-elle ? Appuyez sur Activer la caméra pour voir votre caméra en direct, avec la taille d’image et la cadence.
  - Addresses: en https://how.box/media/webcam-test/, en-us https://how.box/en-us/media/webcam-test/, fi https://how.box/fi/media/webcam-test/, de https://how.box/de/media/webcam-test/, es https://how.box/es/media/webcam-test/, fr https://how.box/fr/media/webcam-test/, sv https://how.box/sv/media/webcam-test/, it https://how.box/it/media/webcam-test/, et https://how.box/et/media/webcam-test/
  - Link to an answer: https://how.box/fr/media/webcam-test/?c={c}&r={r}&m={m} (c: user or environment; r: auto, 720, 1080 or 2160; m: boolean), e.g. https://how.box/fr/media/webcam-test/?c=environment&r=1080&m=0. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker.
  - Agent tools: `webcam_test_describe_picture` (Names a webcam picture size and judges its brightness the way the webcam test does.)
- [Numéro de semaine](https://how.box/fr/datetime/week-number/): Quel est le numéro de la semaine ? Le numéro de semaine ISO actuel, la semaine d’une date et les dates d’une semaine.
  - Addresses: en https://how.box/datetime/week-number/, en-us https://how.box/en-us/datetime/week-number/, fi https://how.box/fi/datetime/week-number/, de https://how.box/de/datetime/week-number/, es https://how.box/es/datetime/week-number/, fr https://how.box/fr/datetime/week-number/, sv https://how.box/sv/datetime/week-number/, it https://how.box/it/datetime/week-number/, et https://how.box/et/datetime/week-number/
  - Link to an answer: https://how.box/fr/datetime/week-number/?d={d}&y={y}&w={w} (d: text; y: whole number 1583 to 9999; w: whole number 1 to 53), e.g. https://how.box/fr/datetime/week-number/?d=2026-12-31&y=2027&w=1. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, reference.
  - Agent tools: `week_number_of_date` (The ISO 8601 week of a date (default: today on the visitor's device): week-numbering year, week (1–53), ISO weekday (1 Monday–7 Sunday), the ISO week date (e.g.); `week_number_dates` (The seven dates (Monday to Sunday, YYYY-MM-DD) of ISO week `week` of week-numbering year `year`, and whether that year has 52 or 53 weeks.)
- [Convertisseur de poids](https://how.box/fr/conversion/weight/): Combien cela pèse-t-il dans d’autres unités ? Convertissez exactement kilogrammes, grammes, livres, onces, stones, tonnes, carats et plus encore.
  - Addresses: en https://how.box/conversion/weight/, en-us https://how.box/en-us/conversion/weight/, fi https://how.box/fi/conversion/weight/, de https://how.box/de/conversion/weight/, es https://how.box/es/conversion/weight/, fr https://how.box/fr/conversion/weight/, sv https://how.box/sv/conversion/weight/, it https://how.box/it/conversion/weight/, et https://how.box/et/conversion/weight/
  - Link to an answer: https://how.box/fr/conversion/weight/?v={v}&from={from}&to={to} (v: number 0 to 1e15; from: mg, g, kg, t, ct, gr, oz, lb, st, ton_us or ton_uk; to: mg, g, kg, t, ct, gr, oz, lb, st, ton_us or ton_uk), e.g. https://how.box/fr/conversion/weight/?v=1&from=kg&to=lb. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, weight, metric, imperial.
  - Agent tools: `weight_convert` (Converts a mass (weight) between units using exact definitions (1 g = 0.001 kg, 1 t = 1000 kg, 1 lb = 0.45359237 kg, 1 oz = 1/16 lb, 1 st = 14 lb, short ton 2000 lb, long ton 2240 lb, metric carat 0.2 g, grain 64.79891 mg; NIST SP 811 B.8).)
  - Preset [Kilogrammes en livres](https://how.box/fr/conversion/kg-to-lb/): Combien de livres vaut un kilogramme ? The same tool, preconfigured.
  - Preset [Livres en kilogrammes](https://how.box/fr/conversion/lb-to-kg/): Combien de kilogrammes vaut une livre ? The same tool, preconfigured.
- [Quelle est mon IP ?](https://how.box/fr/web/what-is-my-ip/): Comment internet voit-il votre connexion ? Votre IP publique et le réseau qui lui correspond.
  - Addresses: en https://how.box/web/what-is-my-ip/, en-us https://how.box/en-us/web/what-is-my-ip/, fi https://how.box/fi/web/what-is-my-ip/, de https://how.box/de/web/what-is-my-ip/, es https://how.box/es/web/what-is-my-ip/, fr https://how.box/fr/web/what-is-my-ip/, sv https://how.box/sv/web/what-is-my-ip/, it https://how.box/it/web/what-is-my-ip/, et https://how.box/et/web/what-is-my-ip/
  - Short address: https://how.box/ip, https://how.box/myip
  - Link to an answer: https://how.box/fr/web/what-is-my-ip/?view={view} (view: ip, ipv6, isp or location), e.g. https://how.box/fr/web/what-is-my-ip/?view=ipv6. Served answer coverage: none (computed in the browser)
  - Uses our server; server limits: 20 requests/minute per visitor, 20 echo/minute per visitor, 20 geoip/minute per visitor, 100 requests/second per global. Tags: checker, network.
  - Agent tools: `what_is_my_ip_lookup` (Shows this browser page’s own connection IP, version, approximate DB-IP location and network ASN.)
  - Preset [Ai-je IPv6 ?](https://how.box/fr/web/do-i-have-ipv6/): Cette connexion utilise-t-elle IPv6 ? The same tool, preconfigured.
  - Preset [Mon fournisseur internet](https://how.box/fr/web/my-isp/): Quel réseau transporte ta connexion ? The same tool, preconfigured.
  - Preset [Localisation IP](https://how.box/fr/web/ip-location/): Où ton IP semble-t-elle se trouver ? The same tool, preconfigured.
- [Recherche WHOIS](https://how.box/fr/web/whois/): Comment ce domaine est-il enregistré ? Retrouvez le bureau d’enregistrement, les dates et les serveurs de noms indiqués par WHOIS.
  - Addresses: en https://how.box/web/whois/, en-us https://how.box/en-us/web/whois/, fi https://how.box/fi/web/whois/, de https://how.box/de/web/whois/, es https://how.box/es/web/whois/, fr https://how.box/fr/web/whois/, sv https://how.box/sv/web/whois/, it https://how.box/it/web/whois/, et https://how.box/et/web/whois/
  - Link to an answer: https://how.box/fr/web/whois/?d={d} (d: text), e.g. https://how.box/fr/web/whois/?d=example.com. Served answer coverage: none (computed in the browser)
  - Uses our server; server limits: 10 requests/minute per visitor, 100 requests/day per visitor, 10 whois/minute per visitor, 10 requests/minute per target, 10 requests/second per global. Tags: checker, network.
  - Agent tools: `whois_lookup` (Looks up domain registration facts through WHOIS from our server.)
- [Carte Wi-Fi](https://how.box/fr/printables/wifi-card/): Comment partager mon Wi-Fi avec mes invités ? Une carte à imprimer avec un code QR que vos invités scannent avec leur téléphone pour rejoindre votre Wi-Fi.
  - Addresses: en https://how.box/printables/wifi-card/, en-us https://how.box/en-us/printables/wifi-card/, fi https://how.box/fi/printables/wifi-card/, de https://how.box/de/printables/wifi-card/, es https://how.box/es/printables/wifi-card/, fr https://how.box/fr/printables/wifi-card/, sv https://how.box/sv/printables/wifi-card/, it https://how.box/it/printables/wifi-card/, et https://how.box/et/printables/wifi-card/
  - Link to an answer: https://how.box/fr/printables/wifi-card/?n={n}&t={t}&h={h}&g={g}&gt={gt}&note={note}&l={l}&p={p} (n: text; t: wpa, wep or none; h: boolean; g: welcome, none or custom; gt: text; note: text; l: single or sheet; p: a4 or letter), e.g. https://how.box/fr/printables/wifi-card/?n=Guests&t=none&h=0&g=welcome&gt=Hello+neighbour&note=Router+in+the+hallway&l=sheet&p=a4. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: generator, network, encoding.
  - Agent tools: `wifi_card_make` (Make a guest Wi-Fi card: fills the visible card with the network and returns the text its QR code carries (WIFI:T:<WPA|WEP|nopass>;S:<ssid>;P:<password>;H:true;; with \ ; , : " escaped), which phone cameras offer to join.)
- [Refroidissement éolien et indice de chaleur](https://how.box/fr/earth/wind-chill/): Quel froid ou quelle chaleur ressent-on vraiment dehors ? La température ressentie : refroidissement éolien par temps froid, indice de chaleur par temps chaud.
  - Addresses: en https://how.box/earth/wind-chill/, en-us https://how.box/en-us/earth/wind-chill/, fi https://how.box/fi/earth/wind-chill/, de https://how.box/de/earth/wind-chill/, es https://how.box/es/earth/wind-chill/, fr https://how.box/fr/earth/wind-chill/, sv https://how.box/sv/earth/wind-chill/, it https://how.box/it/earth/wind-chill/, et https://how.box/et/earth/wind-chill/
  - Link to an answer: https://how.box/fr/earth/wind-chill/?t={t}&w={w}&rh={rh}&u={u}&wu={wu} (t: number; w: number from 0; rh: number 0 to 100; u: c or f; wu: kmh, ms or mph), e.g. https://how.box/fr/earth/wind-chill/?t=-10&w=20&rh=70&u=c&wu=kmh. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, weather, temperature.
  - Agent tools: `wind_chill_feels_like` (Feels-like temperature by the US National Weather Service formulas.)
- [Échelle de Beaufort](https://how.box/fr/conversion/wind-scale/): Quelle est la force du vent sur l’échelle de Beaufort ? Convertissez une vitesse de vent en m/s, km/h, nœuds ou mph en force Beaufort, avec son nom.
  - Addresses: en https://how.box/conversion/wind-scale/, en-us https://how.box/en-us/conversion/wind-scale/, fi https://how.box/fi/conversion/wind-scale/, de https://how.box/de/conversion/wind-scale/, es https://how.box/es/conversion/wind-scale/, fr https://how.box/fr/conversion/wind-scale/, sv https://how.box/sv/conversion/wind-scale/, it https://how.box/it/conversion/wind-scale/, et https://how.box/et/conversion/wind-scale/
  - Link to an answer: https://how.box/fr/conversion/wind-scale/?s={s}&u={u} (s: number 0 to 1000; u: ms, kmh, kt or mph), e.g. https://how.box/fr/conversion/wind-scale/?s=10&u=ms. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, weather, speed.
  - Agent tools: `wind_scale_force` (Beaufort force (0–12) of a mean wind speed, from the WMO Beaufort table in m/s (10-minute mean at 10 m; force 1 from 0.3, 2 from 1.6, 3 from 3.4, 4 from 5.5, 5 from 8.0, 6 from 10.8, 7 from 13.9, 8 from 17.2, 9 from 20.8, 10 from 24.5, 11 from 28.5, 12 from 32.7 m/s).)
- [Calculateur de triangle des vitesses](https://how.box/fr/aviation/wind-triangle/): Quel cap et quelle vitesse sol avec ce vent ? Le cap à suivre, la correction de dérive et la vitesse sol pour une route et un vent, avec durée, carburant et triangle tracé.
  - Addresses: en https://how.box/aviation/wind-triangle/, en-us https://how.box/en-us/aviation/wind-triangle/, fi https://how.box/fi/aviation/wind-triangle/, de https://how.box/de/aviation/wind-triangle/, es https://how.box/es/aviation/wind-triangle/, fr https://how.box/fr/aviation/wind-triangle/, sv https://how.box/sv/aviation/wind-triangle/, it https://how.box/it/aviation/wind-triangle/, et https://how.box/et/aviation/wind-triangle/
  - Link to an answer: https://how.box/fr/aviation/wind-triangle/?c={c}&a={a}&d={d}&s={s}&u={u}&v={v}&l={l}&f={f}&fu={fu} (c: number 0 to 360; a: number 1 to 4000; d: number 0 to 360; s: number 0 to 400; u: kt, kmh or mph; v: number -180 to 180; l: number 0 to 40000; f: number 0 to 100000; fu: l, usgal, kg or lb), e.g. https://how.box/fr/aviation/wind-triangle/?c=90&a=110&d=40&s=20&u=kt&v=9&l=60&f=30&fu=l. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, flight, weather, speed.
  - Agent tools: `wind_triangle_calculate` (Wind triangle (FAA-H-8083-25C ch.)
- [Convertisseur de jauge de fil](https://how.box/fr/conversion/wire-gauge/): Combien de mm² fait ce fil AWG ? Convertissez l’AWG en mm², en kcmil et en diamètre, avec la résistance du cuivre par kilomètre.
  - Addresses: en https://how.box/conversion/wire-gauge/, en-us https://how.box/en-us/conversion/wire-gauge/, fi https://how.box/fi/conversion/wire-gauge/, de https://how.box/de/conversion/wire-gauge/, es https://how.box/es/conversion/wire-gauge/, fr https://how.box/fr/conversion/wire-gauge/, sv https://how.box/sv/conversion/wire-gauge/, it https://how.box/it/conversion/wire-gauge/, et https://how.box/et/conversion/wire-gauge/
  - Link to an answer: https://how.box/fr/conversion/wire-gauge/?v={v}&from={from}&to={to} (v: number -3 to 10000; from: mm2, awg, kcmil, mm or in; to: mm2, awg, kcmil, mm or in), e.g. https://how.box/fr/conversion/wire-gauge/?v=2.5&from=mm2&to=awg. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter.
  - Agent tools: `wire_gauge_convert` (Converts a round solid wire size between cross-section (mm2, kcmil), American Wire Gauge (awg: −3 = 4/0, −2 = 3/0, −1 = 2/0, 0 = 1/0 … 40; ASTM B258 d = 0.127 mm × 92^((36 − n)/39)) and diameter (mm, in).)
- [Compteur de mots](https://how.box/fr/text/word-count/): Quelle est la longueur de votre texte ? Mots, caractères et temps de lecture pendant la saisie.
  - Addresses: en https://how.box/text/word-count/, en-us https://how.box/en-us/text/word-count/, fi https://how.box/fi/text/word-count/, de https://how.box/de/text/word-count/, es https://how.box/es/text/word-count/, fr https://how.box/fr/text/word-count/, sv https://how.box/sv/text/word-count/, it https://how.box/it/text/word-count/, et https://how.box/et/text/word-count/
  - Link to an answer: https://how.box/fr/text/word-count/? (), e.g. https://how.box/fr/text/word-count/?. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator.
  - Agent tools: `word_count_calculate` (Counts Unicode graphemes, non-whitespace characters, words, sentences, blank-line paragraphs, physical lines and UTF-8 bytes.)
- [Jours ouvrés en Finlande](https://how.box/fr/datetime/working-days/): Combien de jours ouvrés y a-t-il en Finlande entre deux dates ? Comptez les jours ouvrés finlandais entre deux dates ou ajoutez-en à une date.
  - Addresses: en https://how.box/datetime/working-days/, en-us https://how.box/en-us/datetime/working-days/, fi https://how.box/fi/datetime/working-days/, de https://how.box/de/datetime/working-days/, es https://how.box/es/datetime/working-days/, fr https://how.box/fr/datetime/working-days/, sv https://how.box/sv/datetime/working-days/, it https://how.box/it/datetime/working-days/, et https://how.box/et/datetime/working-days/
  - Link to an answer: https://how.box/fr/datetime/working-days/?m={m}&f={f}&t={t}&i={i}&n={n} (m: between or add; f: text; t: text; i: boolean; n: whole number -10000 to 10000), e.g. https://how.box/fr/datetime/working-days/?m=add&f=2026-10-14&t=2026-12-31&i=0&n=30. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, reference. Countries: FI (Finlande).
  - Agent tools: `working_days_between` (Count the working days between two dates: the working days, and the calendar days, weekend days and weekday holidays in the range.); `working_days_add` (The date reached by adding working days to a date (negative days subtract).)
- [Horloge mondiale](https://how.box/fr/datetime/world-clock/): Quelle heure est-il à New York, Londres et Tokyo ? Les horloges des villes choisies en direct, avec date, décalage, écart avec votre heure et indication jour ou nuit.
  - Addresses: en https://how.box/datetime/world-clock/, en-us https://how.box/en-us/datetime/world-clock/, fi https://how.box/fi/datetime/world-clock/, de https://how.box/de/datetime/world-clock/, es https://how.box/es/datetime/world-clock/, fr https://how.box/fr/datetime/world-clock/, sv https://how.box/sv/datetime/world-clock/, it https://how.box/it/datetime/world-clock/, et https://how.box/et/datetime/world-clock/
  - Link to an answer: https://how.box/fr/datetime/world-clock/?z={z}&at={at} (z: text; at: text), e.g. https://how.box/fr/datetime/world-clock/?z=Europe%2FHelsinki%2CAmerica%2FNew_York&at=2026-10-16T12%3A00. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: reference, converter.
  - Agent tools: `world_clock_times` (Read the local time in several IANA time zones at one moment, with daylight saving time from the browser's time-zone database.)
- [Calculateur de score z](https://how.box/fr/math/z-score/): À quel point cette valeur est-elle inhabituelle ? Le score z et le centile d’une valeur sur une loi normale, la valeur à un centile donné ou la probabilité entre deux valeurs.
  - Addresses: en https://how.box/math/z-score/, en-us https://how.box/en-us/math/z-score/, fi https://how.box/fi/math/z-score/, de https://how.box/de/math/z-score/, es https://how.box/es/math/z-score/, fr https://how.box/fr/math/z-score/, sv https://how.box/sv/math/z-score/, it https://how.box/it/math/z-score/, et https://how.box/et/math/z-score/
  - Link to an answer: https://how.box/fr/math/z-score/?m={m}&mu={mu}&sd={sd}&x={x}&p={p}&a={a}&b={b} (m: value, percentile or between; mu: number -1e9 to 1e9; sd: number 0 to 1e9; x: number -1e9 to 1e9; p: number 0.0001 to 99.9999; a: number -1e9 to 1e9; b: number -1e9 to 1e9), e.g. https://how.box/fr/math/z-score/?m=value&mu=100&sd=15&x=130&p=90&a=85&b=115. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: calculator, statistics.
  - Agent tools: `z_score_calculate` (Normal distribution with mean and sd (sd > 0).)
- [Heure Zulu](https://how.box/fr/datetime/zulu-time/): Quelle heure est-il en Zulu (UTC) ? L’heure Zulu actuelle et la conversion entre heure Zulu et heure locale, avec le groupe jour-heure utilisé par les pilotes.
  - Addresses: en https://how.box/datetime/zulu-time/, en-us https://how.box/en-us/datetime/zulu-time/, fi https://how.box/fi/datetime/zulu-time/, de https://how.box/de/datetime/zulu-time/, es https://how.box/es/datetime/zulu-time/, fr https://how.box/fr/datetime/zulu-time/, sv https://how.box/sv/datetime/zulu-time/, it https://how.box/it/datetime/zulu-time/, et https://how.box/et/datetime/zulu-time/
  - Link to an answer: https://how.box/fr/datetime/zulu-time/?d={d}&t={t}&day={day}&z={z} (d: from_utc or to_utc; t: text; day: text; z: text), e.g. https://how.box/fr/datetime/zulu-time/?d=from_utc&t=1430&day=2026-10-13&z=Europe%2FHelsinki. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser)
  - Runs entirely in the browser. Tags: converter, flight, reference.
  - Agent tools: `zulu_time_convert` (Convert between Zulu time (UTC, as used in aviation: "1430Z") and local civil time in an IANA time zone, with daylight saving time from the browser's time-zone database.)

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## Optional

- [Full text](https://how.box/fr/llms-full.txt): every tool's explanation and FAQ