# 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/de/agent-tools.json): descriptions and input schemas
- [Catalog](https://how.box/de/catalog.json): utilities and answer-link parameters
- [Full text](https://how.box/de/llms-full.txt): explanations and FAQ
- [Agent terms and limits](https://how.box/de/about/agents/)

## Tools

- [A/B-Test-Signifikanzrechner](https://how.box/de/finance/ab-test/): Ist dein A/B-Test-Ergebnis echt oder nur Zufall? Konversionsraten, Uplift, p-Wert und Konfidenzintervall eines A/B-Tests, mit der nötigen Stichprobengröße.
  - 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/de/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/de/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).)
- [Genaues Alter](https://how.box/de/datetime/age/): Wie alt bist du genau? Dein Alter in Jahren, Monaten und Tagen, die Gesamtwerte und dein nächster Geburtstag.
  - 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/de/datetime/age/?b={b}&d={d} (b: text; d: text), e.g. https://how.box/de/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).)
- [Airline-Codes](https://how.box/de/aviation/airline-codes/): Welche Fluggesellschaft steckt hinter diesem Code? Finde Fluggesellschaften nach IATA- oder ICAO-Code, Rufzeichen oder Name: beide Codes, Rufzeichen, Land und Betriebsstatus.
  - 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/de/aviation/airline-codes/?q={q}&s={s}&c={c} (q: text; s: (empty), current or defunct; c: text), e.g. https://how.box/de/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.)
- [Flughafencodes](https://how.box/de/aviation/airport-codes/): Welcher Flughafen steckt hinter diesem Code? Finde Flughäfen nach IATA- oder ICAO-Code, Name oder Stadt: Codes, Lage, Höhe und Linienverkehr.
  - 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/de/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/de/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).)
- [Fluggeschwindigkeit umrechnen](https://how.box/de/aviation/airspeed/): Wie hängen IAS, CAS, TAS und Mach zusammen? Angezeigte, wahre und äquivalente Fluggeschwindigkeit und Machzahl für Höhe und Temperatur – mit der 2-%-Faustregel neben dem genauen Ergebnis.
  - 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/de/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/de/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.)
- [Höhenmessereinstellungen](https://how.box/de/aviation/altimeter/): Wie hängen QNH, QFE und Flugflächen zusammen? QNH-Höhe, Flugfläche und QFE im Vergleich: hPa ↔ inHg ↔ mmHg, Übergangsflugfläche, Reiseflughöhen und Kältekorrektur.
  - 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/de/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/de/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).)
- [Winkelumrechner](https://how.box/de/conversion/angle/): Wie viel Radiant hat dieser Winkel? Rechne zwischen Grad, Radiant, Gon, Bogenminuten, Bogensekunden, Vollwinkeln und Strich um.
  - 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/de/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/de/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 [Grad in Radiant](https://how.box/de/conversion/degrees-to-radians/): Wie rechnet man Grad in Radiant um? The same tool, preconfigured.
- [Effektivzins berechnen](https://how.box/de/finance/apr/): Wie viel kostet dein Kredit wirklich pro Jahr? Rechne Zinssatz und Gebühren eines Kredits nach der EU-Formel in einen einzigen effektiven Jahreszins um.
  - 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/de/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/de/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.)
- [Flächen umrechnen](https://how.box/de/conversion/area/): Wie groß ist die Fläche in anderen Einheiten? Rechne Quadratmeter, Hektar, Acre, Quadratfuß, Quadratmeilen und weitere Flächeneinheiten exakt um.
  - 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/de/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/de/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 [Acre in Hektar](https://how.box/de/conversion/acres-to-hectares/): Wie viele Hektar hat ein Acre? The same tool, preconfigured.
- [Seitenverhältnis berechnen](https://how.box/de/media/aspect-ratio/): Welches Seitenverhältnis hat dein Bildschirm oder Bild? Bestimme das Verhältnis von Breite zu Höhe oder berechne neue Bild- und Videomaße ohne Verzerrung.
  - 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/de/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/de/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.)
- [Durchschnitt berechnen](https://how.box/de/math/average/): Wie berechnest du den Durchschnitt dieser Zahlen? Mittelwert, Median, Modalwert und Spannweite einer Zahlenliste – mit Anzahl, Summe, kleinstem und größtem Wert.
  - 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/de/math/average/?v={v} (v: text), e.g. https://how.box/de/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).)
- [Barcode-Generator](https://how.box/de/media/barcode/): Wie erstelle ich einen Barcode? EAN-13, EAN-8, UPC-A, Code 128 und finnische Bankbarcodes zum Herunterladen.
  - 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/de/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/de/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 [Bankbarcode-Generator](https://how.box/de/media/bank-barcode/): Wie erstelle ich den Bankbarcode für eine finnische Rechnung? The same tool, preconfigured.
- [Base64 kodieren und dekodieren](https://how.box/de/text/base64/): Wie wandelst du Text oder Dateien in Base64 um? Kodiere Text oder Dateien als Base64 und dekodiere sie wieder – direkt in deinem Browser.
  - 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/de/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/de/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.)
- [Batteriegrößen](https://how.box/de/electronics/battery-sizes/): Wie groß ist eine AA-Batterie, und wie heißt sie anderswo? Alle gängigen Batteriegrößen von AAA bis D, 9 V, Knopfzellen wie CR2032 und LR44 bis 18650: Maße, Spannung, IEC-Bezeichnungen und Entsprechungen.
  - 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/de/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/de/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).)
- [Blutzucker-Umrechner](https://how.box/de/health/blood-sugar/): Wie rechnet man mmol/L in mg/dL um? Rechne Blutzucker zwischen mmol/L und mg/dL um und HbA1c zwischen mmol/mol und %, mit dem geschätzten durchschnittlichen Blutzucker.
  - 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/de/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/de/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.)
- [BMI-Rechner](https://how.box/de/health/bmi/): Wie hoch ist dein Body-Mass-Index (BMI)? Dein BMI mit WHO-Kategorie für Erwachsene, Normalgewichtsbereich für deine Größe und den Grenzen der Aussagekraft.
  - 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/de/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/de/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.)
- [Körperfettrechner](https://how.box/de/health/body-fat/): Wie hoch ist dein Körperfettanteil? Schätze deinen Körperfettanteil mit dem Maßband: Größe, Hals und Taille, bei Frauen auch die Hüfte, nach der US-Navy-Methode.
  - 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/de/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/de/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).)
- [Braille-Übersetzer](https://how.box/de/text/braille/): Wie schreibst du deinen Text in Brailleschrift? Wandle Text in Unified English Braille und zurück um: Buchstaben, Großschreibung, Zahlen und einfache Satzzeichen.
  - 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/de/text/braille/?d={d}&m={m} (d: encode or decode; m: text), e.g. https://how.box/de/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).)
- [Break-even-Rechner](https://how.box/de/finance/break-even/): Wie viel musst du verkaufen, um die Gewinnschwelle zu erreichen? Sieh, welche Stückzahl und welcher Umsatz deine fixen und variablen Kosten decken.
  - 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/de/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/de/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).)
- [Unternehmens-ID-Prüfer](https://how.box/de/finance/business-id/): Ist diese Unternehmens-ID gültig? Prüfe die Prüfziffer einer finnischen Unternehmens-ID und erhalte die passende USt-IdNr.
  - 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/de/finance/business-id/?id={id} (id: text), e.g. https://how.box/de/finance/business-id/?id=0112038-9. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker, tax. Countries: FI (Finnland).
  - 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.)
- [Kalender zum Ausdrucken](https://how.box/de/printables/calendar/): Wie drucke ich einen Kalender? Ein Jahr oder Monat auf einer Seite, mit Kalenderwochen und Feiertagen, druckfertig.
  - 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/de/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/de/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).)
- [Täglichen Kalorienbedarf berechnen](https://how.box/de/health/calories/): Wie viele Kalorien brauchst du am Tag? Dein Grundumsatz (BMR) und geschätzter Tagesbedarf in kcal oder kJ, berechnet aus Alter, Körpermaßen und Aktivität.
  - 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/de/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/de/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.)
- [Kalorienverbrauch-Rechner](https://how.box/de/health/calories-burned/): Wie viele Kalorien verbrennst du beim Training? Dein Energieverbrauch bei rund 200 Aktivitäten, vom Gehen und Laufen bis zu Schwimmen, Skifahren und Hausarbeit, nach ihren MET-Werten.
  - 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/de/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/de/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.)
- [Autokreditrechner](https://how.box/de/finance/car-loan/): Wie viel kostet dein Autokredit? Sieh Monatsrate und gesamte Kaufkosten einschließlich Anzahlung, Inzahlungnahme, Steuern und Gebühren.
  - 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/de/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/de/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.)
- [Groß- und Kleinschreibung ändern](https://how.box/de/text/case/): Wie soll dein Text großgeschrieben werden? Ändere die Groß- und Kleinschreibung und kopiere jede Variante.
  - 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/de/text/case/? (), e.g. https://how.box/de/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.)
- [Schachuhr](https://how.box/de/datetime/chess-clock/): Wie viel Zeit hat jeder Spieler? Zwei Schachuhren mit Inkrement oder Verzögerung, Zugzähler und Zeitüberschreitung bei null.
  - 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/de/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/de/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.)
- [Akkordfinder](https://how.box/de/music/chords/): Wie spielst du diesen Akkord? Wähle Grundton und Akkordtyp, sieh Noten und Formel auf der Klaviatur und höre sie an. Oder wähle Noten, um den Akkord zu bestimmen.
  - 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/de/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/de/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).)
- [Quintenzirkel](https://how.box/de/music/circle-of-fifths/): Wie viele Kreuze oder Bs hat deine Tonart? Wähle eine Tonart im Quintenzirkel: Sieh Vorzeichen, Paralleltonart, Tonleiter und Akkorde und höre sie auf dem Klavier.
  - 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/de/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/de/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.)
- [QR- und Barcode-Scanner](https://how.box/de/media/code-scan/): Wie scanne ich einen QR-Code oder Barcode? Scanne per Kamera oder Bild und sieh vor dem Öffnen, was ein Code enthält und wohin ein Link tatsächlich führt.
  - 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/de/media/code-scan/?f={f} (f: all, qr or linear), e.g. https://how.box/de/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 [QR-Code-Scanner](https://how.box/de/media/qr-scan/): Wie scanne ich einen QR-Code sicher? The same tool, preconfigured.
  - Preset [Barcode-Scanner](https://how.box/de/media/barcode-scan/): Wie lese ich einen Barcode? The same tool, preconfigured.
- [Farben umrechnen](https://how.box/de/web/color/): Wie schreibst du eine Farbe als HEX, RGB oder HSL? Wähle eine Farbe oder gib sie ein. Kopiere HEX, RGB, HSL, HWB oder OKLCH und sieh den nächsten CSS-Farbnamen.
  - 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/de/web/color/?c={c} (c: text), e.g. https://how.box/de/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.)
- [Kombinationen und Permutationen berechnen](https://how.box/de/math/combinations/): Wie viele Möglichkeiten gibt es, sie auszuwählen? Exakte Anzahl von Kombinationen und Permutationen, mit oder ohne Wiederholung, und die Chance auf eine bestimmte Auswahl.
  - 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/de/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/de/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 [Lotto-Gewinnchancen berechnen](https://how.box/de/math/lottery-odds/): Wie wahrscheinlich ist ein Lottogewinn? The same tool, preconfigured.
- [Zinseszinsrechner](https://how.box/de/finance/compound-interest/): Wie stark wächst dein Erspartes mit Zinseszins? Sieh Endguthaben, eigene Einzahlungen und Zinsertrag – Jahr für Jahr.
  - 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/de/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/de/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.)
- [Betonrechner](https://how.box/de/everyday/concrete/): Wie viel Beton brauche ich? Kubikmeter oder Kubikyard Beton und Säcke Fertigbeton für eine Platte, ein Fundament oder Pfostenlöcher.
  - 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/de/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/de/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.)
- [Konfidenzintervall berechnen](https://how.box/de/math/confidence-interval/): Wie genau ist die Schätzung deiner Stichprobe? Das Konfidenzintervall für einen Mittelwert oder Anteil aus einer Stichprobe, mit Fehlermarge und verwendeter Methode.
  - 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/de/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/de/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.)
- [Farbkontrast prüfen](https://how.box/de/web/contrast/): Wie gut lässt sich dieser Text auf dem Hintergrund lesen? Prüfe den WCAG-Kontrast, sieh erfüllte Stufen und finde eine ähnliche Textfarbe, die die Anforderungen erfüllt.
  - 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/de/web/contrast/?fg={fg}&bg={bg} (fg: text; bg: text), e.g. https://how.box/de/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.)
- [Küchenmaße umrechnen](https://how.box/de/conversion/cooking/): Wie viele Gramm sind ein Cup? Rechne Rezeptmengen passend zur Zutat um.
  - 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/de/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/de/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 [Cup Zucker in Gramm](https://how.box/de/conversion/cup-of-sugar-in-grams/): Wie viel Gramm hat ein Cup Zucker? The same tool, preconfigured.
  - Preset [Cup Butter in Gramm](https://how.box/de/conversion/cup-of-butter-in-grams/): Wie viel Gramm hat ein Cup Butter? The same tool, preconfigured.
- [Countdown](https://how.box/de/datetime/countdown/): Wie lange noch bis zum großen Tag? Tage, Stunden, Minuten und Sekunden bis zu einem Termin oder bis Neujahr, Weihnachten oder Mittsommer – live und im Vollbild.
  - 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/de/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/de/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 [Countdown bis zum 1. Weihnachtstag](https://how.box/de/datetime/christmas-countdown/): Wie viele Tage sind es bis zum ersten Weihnachtstag? The same tool, preconfigured.
  - Preset [Countdown bis Heiligabend](https://how.box/de/datetime/christmas-eve-countdown/): Wie viele Tage sind es noch bis Heiligabend? The same tool, preconfigured.
  - Preset [Mittsommer-Countdown](https://how.box/de/datetime/midsummer-countdown/): Wie lange noch bis zum Mittsommerabend? The same tool, preconfigured.
- [Ländercodes](https://how.box/de/everyday/country-codes/): Welche ISO-Codes, Vorwahlen und Domains hat ein Land? ISO-3166-Codes mit zwei Buchstaben, drei Buchstaben und Ziffern sowie Vorwahlen und Domains von 249 Ländern und Gebieten.
  - 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/de/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/de/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 [Internationale Ländervorwahlen](https://how.box/de/everyday/calling-codes/): Wie wählst du eine Telefonnummer im Ausland? The same tool, preconfigured.
  - Preset [Länderpräfixe von Luftfahrzeugkennzeichen](https://how.box/de/everyday/aircraft-prefixes/): In welchem Land ist ein Luftfahrzeug registriert? The same tool, preconfigured.
- [Kreditkarten-Tilgungsrechner](https://how.box/de/finance/credit-card/): Wie lange dauert es, bis deine Kreditkarte abbezahlt ist? Sieh, wie viele Monate es bis zum Saldo null dauert und was du an Zinsen zahlst – mit fester Rate oder dem Mindestbetrag der Karte.
  - 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/de/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/de/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).)
- [Seitenwindrechner](https://how.box/de/aviation/crosswind/): Wie viel Seitenwind herrscht auf der Piste? Seitenwind, Gegenwind oder Rückenwind auf jeder Piste, mit Böen, Pistendiagramm und der Seitenwindgrenze deines Flugzeugs.
  - 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/de/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/de/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.)
- [CSS-Einheitenumrechner](https://how.box/de/conversion/css-units/): Wie viel rem sind diese Pixel? Rechne CSS-Längen zwischen px, rem, em, pt, pc, in, cm, mm und Q bei deiner Schriftgröße um.
  - 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/de/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/de/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 in rem](https://how.box/de/conversion/px-to-rem/): Wie viel rem sind so viele Pixel? The same tool, preconfigured.
- [Währungsrechner](https://how.box/de/finance/currency/): Wie viel ist das in einer anderen Währung? Rechne rund 30 Währungen mit den täglichen Referenzkursen der Europäischen Zentralbank um und sieh den Kurstag.
  - 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/de/finance/currency/?a={a}&f={f}&t={t} (a: number 0 to 1e12; f: text; t: text), e.g. https://how.box/de/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).)
- [Währungscodes](https://how.box/de/finance/currency-codes/): Welchen Währungscode haben der Euro, der Yen und der Dollar? Alle heute gültigen Währungen mit ISO-4217-Code, Zifferncode, Symbol, Dezimalstellen und den Ländern, die sie verwenden, in deiner Sprache.
  - 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/de/finance/currency-codes/?q={q}&d={d}&c={c} (q: text; d: (empty), 0, 2 or 3; c: text), e.g. https://how.box/de/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.)
- [Kontrollleuchten im Auto](https://how.box/de/vehicles/dashboard-lights/): Was bedeutet die Warnleuchte im Armaturenbrett? Finden Sie eine Kontrollleuchte über ihr Symbol oder ihren Namen: was sie bedeutet, wie dringend sie nach Farbe ist und was jetzt zu tun ist.
  - 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/de/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/de/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.)
- [Datengrößen umrechnen](https://how.box/de/conversion/data-size/): Wie groß ist die Datenmenge in anderen Einheiten? Rechne Byte, Kilobyte, Megabyte, Gigabyte, MiB, GiB und Bit um – mit klarer Trennung zwischen 1.000 und 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/de/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/de/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 [Gigabyte in Gibibyte](https://how.box/de/conversion/gb-to-gib/): Wie viele Gibibyte sind ein Gigabyte? The same tool, preconfigured.
- [Tagerechner](https://how.box/de/datetime/date-diff/): Wie viele Tage liegen zwischen deinen Daten? Kalendertage, ganze Monate und finnische Arbeitstage.
  - 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/de/datetime/date-diff/?f={f}&t={t}&i={i} (f: text; t: text; i: boolean), e.g. https://how.box/de/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).)
- [Tagessatz-Rechner](https://how.box/de/finance/day-fine/): Wie hoch ist ein Tagessatz in Finnland? Ein Tagessatz und die Gesamtstrafe aus deinem Nettoeinkommen und deinen Unterhaltsberechtigten, nach dem finnischen Strafgesetzbuch.
  - 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/de/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/de/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 (Finnland).
  - Agent tools: `day_fine_calculate` (Finland only: one day-fine (päiväsakko) and the total fine under Rikoslaki 2 a luku and decree 609/1999.)
- [Wochentag](https://how.box/de/datetime/day-of-week/): Welcher Wochentag ist es? Der Wochentag jedes Datums und wie viele Tage es zurückliegt oder noch entfernt ist.
  - 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/de/datetime/day-of-week/?d={d} (d: text), e.g. https://how.box/de/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.)
- [Schuldentilgungsrechner](https://how.box/de/finance/debt-payoff/): Wie schnell kannst du alle deine Schulden abbezahlen? Sieh, wann du schuldenfrei bist und was die Zinsen kosten – mit dem höchsten Zinssatz oder der kleinsten Schuld zuerst.
  - 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/de/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/de/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).)
- [Dezimalstunden-Rechner](https://how.box/de/datetime/decimal-hours/): Wie viele Dezimalstunden sind 7 Stunden 30 Minuten? Stunden und Minuten in Dezimalstunden und zurück, dazu die Summe eines Stundenzettels in beiden Formen.
  - 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/de/datetime/decimal-hours/?t={t}&d={d} (t: text; d: whole number 0 to 4), e.g. https://how.box/de/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.)
- [Dichteumrechner](https://how.box/de/conversion/density/): Wie hoch ist diese Dichte in anderen Einheiten? Rechne zwischen kg/m³, g/cm³, kg/L, g/L, lb/ft³, lb/in³, oz/in³ und Pfund pro Gallone um.
  - 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/de/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/de/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).)
- [Dichtehöhe](https://how.box/de/aviation/density-altitude/): Wie hoch ist die Dichtehöhe heute? Druckhöhe und Dichtehöhe aus Flugplatzhöhe, QNH und Temperatur – und was dünne Luft für den Start bedeutet.
  - 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/de/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/de/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).)
- [Sinkflugrechner](https://how.box/de/aviation/descent/): In welcher Entfernung solltest du den Sinkflug beginnen? Sinkflugbeginn, Sinkrate und Dauer nach Flugbahnwinkel oder Sinkrate – mit der 3:1-Faustregel neben dem genauen Ergebnis.
  - 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/de/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/de/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.)
- [Taupunktrechner](https://how.box/de/earth/dew-point/): Ab welcher Temperatur beschlagen deine Fenster? Berechne den Taupunkt aus Temperatur und Luftfeuchtigkeit oder die Luftfeuchtigkeit aus dem Taupunkt.
  - 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/de/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/de/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.)
- [Würfelroller](https://how.box/de/everyday/dice/): Welche Zahl zeigen die Würfel? Wirf einen oder mehrere Würfel, d20 oder 3d6+2, mit fairen Ergebnissen für den ganzen Bildschirm.
  - 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/de/everyday/dice/?n={n} (n: text), e.g. https://how.box/de/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).)
- [Rabattrechner](https://how.box/de/everyday/discount/): Wie viel zahlst du nach dem Rabatt? Sieh den Angebotspreis und deine Ersparnis.
  - 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/de/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/de/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.)
- [DNS-Abfrage](https://how.box/de/web/dns/): Wie ist deine Domain im DNS eingerichtet? Frage Adressen, Mailserver und weitere DNS-Einträge ab.
  - 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/de/web/dns/?h={h}&t={t} (h: text; t: A, AAAA, CNAME, MX, TXT, NS, SOA or CAA), e.g. https://how.box/de/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.)
- [Downloadzeit berechnen](https://how.box/de/web/download-time/): Wie lange dauert dein Download? Gib Dateigröße und Verbindungsgeschwindigkeit ein und sieh, wie lange ein Download oder Upload dauert.
  - 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/de/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/de/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)).)
- [Drohnenflugzeit](https://how.box/de/aviation/drone-flight-time/): Wie lange fliegt meine Drohne mit einer Akkuladung? Flugzeit aus mAh und Spannung oder Wh sowie mittlerer Strom- oder Leistungsaufnahme, mit Landereserve und Energie in 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/de/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/de/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).)
- [Drohnenregeln](https://how.box/de/aviation/drone-rules/): Welche Regeln gelten für meine Drohne? Die EU-Kategorie nach Gewicht und Klassenkennzeichnung deiner Drohne: Registrierung, Schulung, Alter und Abstände zu Menschen.
  - 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/de/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/de/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).)
- [Drumcomputer](https://how.box/de/music/drum-machine/): Wie wäre es mit deinem eigenen Drumbeat? Baue einen Beat mit 16 Schritten, Kick, Snare, Hi-Hats, Clap und Tom. Spiele ihn in deinem Tempo und ergänze ihn live über die Pads.
  - 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/de/music/drum-machine/?t={t}&p={p} (t: whole number 40 to 240; p: text), e.g. https://how.box/de/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.)
- [Zeitumstellung](https://how.box/de/datetime/dst/): Wann werden die Uhren das nächste Mal umgestellt? Die nächste und die letzte Zeitumstellung in jeder Zeitzone, ob die Uhren vor- oder zurückgestellt werden, und jede Umstellung eines Jahres.
  - 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/de/datetime/dst/?z={z}&y={y} (z: text; y: whole number 1970 to 2100), e.g. https://how.box/de/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.)
- [Geburtstermin berechnen](https://how.box/de/health/due-date/): Wie weit ist deine Schwangerschaft fortgeschritten? Schätze Geburtstermin, Schwangerschaftswoche und Trimester anhand von Periode, Empfängnis oder IVF-Transfer.
  - 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/de/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/de/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.)
- [Zeitdauer berechnen](https://how.box/de/datetime/duration/): Wie viel Zeit ist das? Berechne die Zeit zwischen zwei Daten mit Uhrzeiten, addiere oder subtrahiere eine Dauer oder summiere Zeiten im Format 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/de/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/de/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).)
- [Normwerte der E-Reihen](https://how.box/de/electronics/e-series/): Welcher Normwert für Widerstand oder Kondensator liegt am nächsten? Finde den nächsten Wert der Reihen E3 bis E192 zu deinem Wert, mit Nachbarn und Abweichung.
  - 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/de/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/de/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).)
- [Stromkostenrechner](https://how.box/de/finance/electricity-cost/): Wie viel kostet der Betrieb eines Geräts? Berechne kWh und Kosten aus Geräteleistung, täglicher Nutzungsdauer und deinem Strompreis.
  - 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/de/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/de/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.)
- [Arbeitgeberkosten-Rechner](https://how.box/de/finance/employer-cost/): Wie viel kostet ein Arbeitnehmer den Arbeitgeber in Finnland? Was ein Monatsgehalt einen finnischen Arbeitgeber mit Renten-, Arbeitslosen- und Krankenversicherungsbeiträgen kostet.
  - 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/de/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/de/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 (Finnland).
  - 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).)
- [Energie umrechnen](https://how.box/de/conversion/energy/): Wie viel ist diese Energie in anderen Einheiten? Rechne Joule, Kilowattstunden, Kilokalorien, BTU und weitere Einheiten mit exakten Definitionen um.
  - 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/de/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/de/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 [Kilokalorien in Kilojoule](https://how.box/de/conversion/kcal-to-kj/): Wie viele Kilojoule hat eine Kilokalorie? The same tool, preconfigured.
- [E-Auto-Laderechner](https://how.box/de/vehicles/ev-charging/): Wie lange dauert das Laden deines E-Autos und was kostet es? Ladezeit, Netzenergie und Kosten für jeden Lader, mit Ladeverlusten und den Grenzen deines Autos.
  - 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/de/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/de/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 [E-Auto-Ladekostenrechner](https://how.box/de/vehicles/ev-charging-cost/): Was kostet es, dein E-Auto zu laden? The same tool, preconfigured.
  - Preset [E-Auto-Ladezeitrechner](https://how.box/de/vehicles/ev-charging-time/): Wie lange braucht dein E-Auto zum Laden? The same tool, preconfigured.
- [Reichweitenrechner für Elektroautos](https://how.box/de/vehicles/ev-range/): Wie weit kommt dein Elektroauto? Schätze die Reichweite aus Akkugröße, Verbrauch und Ladestand, optional bei Kälte.
  - 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/de/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/de/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 [Reichweite des E-Autos im Winter](https://how.box/de/vehicles/ev-winter-range/): Wie weit kommt dein Elektroauto im Winter? The same tool, preconfigured.
- [Entschädigung bei Flugverspätung](https://how.box/de/aviation/flight-delay-compensation/): Wie viel Entschädigung steht dir für deinen verspäteten Flug zu? Prüfe EU 261 und UK 261: 250–600 € oder 220–520 £ bei Verspätung, Annullierung oder Überbuchung, mit Begründung.
  - 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/de/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/de/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.)
- [Ankunftszeit des Flugs](https://how.box/de/everyday/flight-time/): Wann landet mein Flug, in Ortszeit? Die örtliche Landezeit aus Abflugzeit und Flugdauer, über Zeitzonen, Sommerzeit und Datumsgrenze hinweg.
  - 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/de/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/de/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.)
- [Kraftumrechner](https://how.box/de/conversion/force/): Wie viel Kraft ist das in anderen Einheiten? Rechne zwischen Newton, Kilonewton, Kilopond, Pound-force, Kip, Dyn und Poundal um.
  - 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/de/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/de/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).)
- [Bruchrechner](https://how.box/de/math/fraction/): Wie viel ist das als Bruch? Addiere, subtrahiere, multipliziere und dividiere Brüche und gemischte Zahlen oder wandle eine Dezimalzahl in einen vollständig gekürzten Bruch um.
  - 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/de/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/de/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.)
- [Spritkostenrechner](https://how.box/de/everyday/fuel-cost/): Wie viel kostet der Kraftstoff für deine Fahrt? Berechne Kraftstoffbedarf und Fahrtkosten aus Strecke, Verbrauch und Kraftstoffpreis.
  - 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/de/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/de/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.)
- [Kraftstoffverbrauch umrechnen](https://how.box/de/conversion/fuel-economy/): Wie viel verbraucht dein Auto in anderen Einheiten? Rechne zwischen l/100 km, km/l, Meilen pro Gallone (US und imperial) sowie kWh/100 km und mi/kWh für Elektroautos um.
  - 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/de/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/de/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 [Meilen pro Gallone in l/100 km](https://how.box/de/conversion/mpg-to-l-100km/): Wie viele Liter pro 100 km entsprechen deinem mpg-Wert? The same tool, preconfigured.
  - Preset [Elektroauto-Verbrauch](https://how.box/de/conversion/ev-consumption/): Wie effizient ist dein Elektroauto? The same tool, preconfigured.
- [Vollbilduhr](https://how.box/de/datetime/fullscreen-clock/): Wie spät ist es? Eine gut lesbare Uhr für deinen Schreibtisch oder den ganzen Raum.
  - 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/de/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/de/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
- [ggT- und kgV-Rechner](https://how.box/de/math/gcd/): Was haben diese Zahlen gemeinsam? Größter gemeinsamer Teiler und kleinstes gemeinsames Vielfaches von zwei bis zehn ganzen Zahlen, mit euklidischem Rechenweg.
  - 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/de/math/gcd/?n={n}&s={s} (n: text; s: gcd or lcm), e.g. https://how.box/de/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 [kgV-Rechner](https://how.box/de/math/lcm/): Was ist das kleinste gemeinsame Vielfache? The same tool, preconfigured.
- [Schenkungsteuer-Rechner](https://how.box/de/finance/gift-tax/): Wie viel Schenkungsteuer fällt in Finnland auf ein Geschenk an? Die finnische Schenkungsteuer auf ein Geschenk, mit den früheren Schenkungen derselben Person aus den letzten drei Jahren.
  - 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/de/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/de/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 (Finnland).
  - 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 €).)
- [Karopapier](https://how.box/de/printables/graph-paper/): Wie drucke ich Karopapier in der richtigen Größe? Ein quadratisches Raster, passend zu deinem 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/de/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/de/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.)
- [Hash-Generator](https://how.box/de/web/hash/): Wie berechnest du den Hash eines Textes? SHA-256-, SHA-512-, SHA-1- und MD5-Hashes für beliebige Texte, direkt in deinem Browser.
  - 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/de/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/de/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.)
- [Pulszonen-Rechner](https://how.box/de/health/heart-rate/): Wie schnell sollte dein Herz beim Training schlagen? Deine geschätzte maximale Herzfrequenz und fünf Trainingszonen aus Alter und Ruhepuls, nach der Karvonen-Methode mit der Herzfrequenzreserve.
  - 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/de/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/de/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.)
- [Feiertage in Finnland](https://how.box/de/datetime/holidays/): Wann sind die nächsten Feiertage in Finnland? Finnische Feiertage und Vorabende für jedes Jahr, mit Wochentagen und Tagen bis zum nächsten Feiertag.
  - 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/de/datetime/holidays/?y={y}&v={v} (y: whole number 1992 to 2100; v: all or flag_days), e.g. https://how.box/de/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 (Finnland).
  - 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 [Flaggentage in Finnland](https://how.box/de/datetime/flag-days/): Wann sind die Flaggentage in Finnland? The same tool, preconfigured.
- [Wallbox-Ladeleistung](https://how.box/de/vehicles/home-charger/): Wie schnell kannst du dein Auto zu Hause laden? Phasen, Ampere und Volt ergeben die Ladeleistung und die Zeit für die Energie, die du brauchst.
  - 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/de/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/de/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 [11-kW-Wallbox](https://how.box/de/vehicles/11-kw-charger/): Wie lange braucht dein Auto an einer 11-kW-Wallbox? The same tool, preconfigured.
- [HTTP-Statuscodes](https://how.box/de/web/http-status/): Was bedeutet der HTTP-Status 404? Schlage jeden HTTP-Statuscode nach: was 200, 301, 404, 429 oder 503 bedeutet, wann ein Server ihn sendet, ob Caches ihn speichern und welcher RFC ihn festlegt.
  - 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/de/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/de/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.)
- [IBAN-Prüfer](https://how.box/de/finance/iban/): Ist diese IBAN gültig? Prüfe die Prüfziffern einer IBAN und sieh sie in Papierform, Teil für Teil.
  - 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/de/finance/iban/?iban={iban} (iban: text), e.g. https://how.box/de/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.)
- [Bild komprimieren](https://how.box/de/media/image-compress/): Wie klein kann deine Bilddatei werden? Verkleinere eine Fotodatei und sieh die Ersparnis. Sie bleibt auf deinem Gerät.
  - 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/de/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/de/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 [Bild auf 100 KB verkleinern](https://how.box/de/media/compress-image-to-100kb/): Wie bekommst du ein Foto unter 100 KB? The same tool, preconfigured.
- [Bild umwandeln](https://how.box/de/media/image-convert/): Wie änderst du den Dateityp eines Bildes? Wandle ein Bild zwischen PNG, JPEG, WebP und AVIF um. Es bleibt auf deinem Gerät.
  - 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/de/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/de/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.)
- [Bildgröße ändern](https://how.box/de/media/image-resize/): Wie groß soll dein Bild sein? Ändere die Bildgröße nach Breite, Höhe oder Prozent. Das Bild bleibt auf deinem Gerät.
  - 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/de/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/de/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.)
- [Erbschaftsteuer-Rechner](https://how.box/de/finance/inheritance-tax/): Wie viel Erbschaftsteuer zahlst du in Finnland? Die finnische Erbschaftsteuer auf deinen Erbteil, nach Steuerklasse, Abzügen und dem Tarif zum Todestag.
  - 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/de/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/de/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 (Finnland).
  - 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 €).)
- [Intervalltimer](https://how.box/de/datetime/interval-timer/): Wie lange dauert dein Training, Runde für Runde? Belastungs- und Pausenrunden mit großer Anzeige und einem Ton bei jedem Wechsel.
  - 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/de/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/de/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).)
- [Website erreichbar?](https://how.box/de/web/is-it-down/): Wie antwortet diese Website? Prüfe die Antwort einer Website von unserem Server aus.
  - 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/de/web/is-it-down/?u={u} (u: text), e.g. https://how.box/de/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.)
- [JSON-Formatierer](https://how.box/de/web/json/): Wie kannst du JSON formatieren und prüfen? Füge JSON ein, um Fehler zu finden, es übersichtlich zu formatieren oder zu komprimieren.
  - 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/de/web/json/?mode={mode}&indent={indent}&sort={sort} (mode: pretty or minify; indent: 2, 4 or tab; sort: boolean), e.g. https://how.box/de/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.)
- [Tastaturtest](https://how.box/de/media/keyboard-test/): Wie gut funktioniert deine Tastatur? Drücke Tasten, um ihre Codes zu sehen und zu verfolgen, welche du bereits getestet hast.
  - 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/de/media/keyboard-test/?layout={layout} (layout: ansi or iso), e.g. https://how.box/de/media/keyboard-test/?layout=iso. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: checker.
  - Agent tools: none
- [Verzugszinsrechner](https://how.box/de/finance/late-interest/): Wie viel Verzugszinsen sind in Finnland fällig? Gesetzliche Verzugszinsen auf eine überfällige finnische Forderung: Referenzzinssatz plus 7 Punkte, Halbjahr für Halbjahr.
  - 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/de/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/de/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 (Finnland).
  - 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.)
- [Pflegesymbole](https://how.box/de/everyday/laundry-symbols/): Wie liest man die Symbole auf dem Pflegeetikett? Jedes Pflegesymbol erklärt: Waschbottich, Dreieck, Quadrat, Bügeleisen und Kreis, mit Temperaturen, Punkten und Balken in klaren Worten.
  - 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/de/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/de/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.)
- [Abfahrtszeit-Rechner](https://how.box/de/everyday/leave-by/): Wann muss ich losfahren, um pünktlich anzukommen? Die späteste Zeit zum Losfahren: deine Ankunftszeit minus Fahrt, Pausen unterwegs und Puffer, auch über Zeitzonen hinweg.
  - 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/de/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/de/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).)
- [LED-Sparrechner](https://how.box/de/everyday/led-savings/): Wie viel sparst du mit LED-Lampen? Vergleiche eine alte Glühbirne mit einer LED: gesparte Energie und Geld pro Jahr und wie schnell sich die LED bezahlt macht.
  - 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/de/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/de/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.)
- [Längen umrechnen](https://how.box/de/conversion/length/): Wie lang ist das in anderen Einheiten? Rechne metrische und angloamerikanische Längen exakt um.
  - 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/de/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/de/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 [Meilen in Kilometer](https://how.box/de/conversion/miles-to-km/): Wie viele Kilometer hat eine Meile? The same tool, preconfigured.
  - Preset [Zentimeter in Zoll](https://how.box/de/conversion/cm-to-inches/): Wie viel Zoll hat ein Zentimeter? The same tool, preconfigured.
  - Preset [Zoll in Zentimeter](https://how.box/de/conversion/inches-to-cm/): Wie viele Zentimeter hat ein Zoll? The same tool, preconfigured.
  - Preset [Fuß in Meter](https://how.box/de/conversion/feet-to-metres/): Wie viele Meter hat ein Fuß? The same tool, preconfigured.
- [Kreditrechner](https://how.box/de/finance/loan/): Wie viel kostet dein Kredit wirklich? Raten, Zinsen und Gebühren für jeden Kredit: Annuität oder Ratentilgung, monatlich oder in größeren Abständen.
  - 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/de/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/de/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.)
- [Logikgatter](https://how.box/de/electronics/logic-gates/): Wie funktionieren AND-, OR-, NOT- und XOR-Gatter? Schalte die Eingänge um und sieh sofort den Ausgang jedes Logikgatters, mit dem Symbol in beiden Normstilen, dem booleschen Ausdruck und der Wahrheitstabelle.
  - 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/de/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/de/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.)
- [Gepäckgröße prüfen](https://how.box/de/everyday/luggage-size/): Passt meine Tasche in die Größenlimits? Prüfe Höhe, Breite, Tiefe und Gewicht gegen beliebige Limits, mit Gesamtsumme L + B + H, Kofferzeichnung und Zentimetern oder Zoll.
  - 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/de/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/de/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 [Handgepäckmaße nach Fluggesellschaft](https://how.box/de/everyday/cabin-baggage/): Passt meine Tasche in die Kabine? The same tool, preconfigured.
- [Makro-Rechner](https://how.box/de/health/macros/): Wie viel Gramm Eiweiß, Fett und Kohlenhydrate sind das? Mach aus einem täglichen Kalorienziel und einer Aufteilung in Prozent Gramm Eiweiß, Fett und Kohlenhydrate, pro Tag und pro Mahlzeit.
  - 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/de/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/de/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.)
- [Margenrechner](https://how.box/de/finance/margin/): Wie viel Marge machst du bei einem Verkauf? Sieh Gewinnmarge, Aufschlag und Gewinn aus Einkaufs- und Verkaufspreis.
  - 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/de/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/de/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 [Aufschlagsrechner](https://how.box/de/finance/markup/): Wie hoch ist dein Aufschlag? The same tool, preconfigured.
- [Rechenübungen](https://how.box/de/kids/math-drills/): Wie gut beherrschst du die Grundrechenarten? Übe in deinem Tempo oder drucke ein Blatt zum Rechnen auf 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/de/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/de/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.)
- [Meetingplaner](https://how.box/de/datetime/meeting-planner/): Wie findest du eine passende Meetingzeit für alle Zeitzonen? Wähle zwei bis sechs Orte und einen Tag für Stundenraster, Arbeitszeiten und die beste Zeit für alle.
  - 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/de/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/de/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.)
- [METAR- und TAF-Decoder](https://how.box/de/aviation/metar/): Wie liest du einen METAR oder TAF? Füge eine Flugwettermeldung ein und lies jede Gruppe in Klartext, mit Flugwetterkategorie, Luftfeuchtigkeit und Dichtehöhe.
  - 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/de/aviation/metar/?r={r} (r: text), e.g. https://how.box/de/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.)
- [Metronom: gleichmäßiger Takt zum Üben](https://how.box/de/music/metronome/): Wie hältst du einen gleichmäßigen Takt? Stelle das Tempo ein, höre den Schlag und folge dem Pendel.
  - 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/de/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/de/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.)
- [Mikrofontest](https://how.box/de/media/mic-test/): Funktioniert mein Mikrofon? Drücke Starten und sprich: Die Pegelanzeige zeigt, was dein Mikrofon erfasst.
  - 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/de/media/mic-test/?p={p} (p: raw or voice), e.g. https://how.box/de/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.)
- [Kilometergeld-Rechner](https://how.box/de/finance/mileage/): Wie viel steuerfreies Kilometergeld bekommst du in Finnland? Das steuerfreie Kilometergeld und Tagegeld für eine Dienstreise in Finnland, zu den Sätzen der finnischen Steuerverwaltung.
  - 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/de/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/de/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 (Finnland).
  - 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).)
- [Mode-S-Adresse nachschlagen](https://how.box/de/aviation/mode-s/): Aus welchem Land stammt die Transponderadresse eines Flugzeugs? Gib die 24-Bit-Adresse für Mode S oder ADS-B als Hex-, Oktal- oder Binärzahl ein und sieh, zu welchem Länderblock sie gehört.
  - 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/de/aviation/mode-s/?a={a}&b={b} (a: text; b: hex, octal or binary), e.g. https://how.box/de/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.)
- [Mondphase](https://how.box/de/datetime/moon-phase/): Welche Phase hat der Mond? Die Mondphase jetzt oder an einem beliebigen Datum, mit beleuchtetem Anteil und nächstem Neu- und Vollmond.
  - 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/de/datetime/moon-phase/?d={d}&lat={lat}&lon={lon}&z={z} (d: text; lat: text; lon: text; z: text), e.g. https://how.box/de/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.)
- [Morsecode-Übersetzer](https://how.box/de/text/morse/): Wie schreibst, spielst und hörst du Morsecode? Wandle Text in Morsecode und zurück um, spiele Ton oder Licht ab, entschlüssle über Mikrofon oder Kamera oder morse von Hand.
  - 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/de/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/de/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.)
- [Morsetrainer](https://how.box/de/text/morse-trainer/): Wie lernst du Morsecode nach Gehör mitzuschreiben? Lerne Morsecode nach Koch: Höre Zufallsgruppen im vollen Tempo, tippe sie ein und ergänze bei 90 % Genauigkeit ein Zeichen.
  - 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/de/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/de/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).)
- [Tilgungsrechner](https://how.box/de/finance/mortgage/): Wie viel kostet dein Immobilienkredit wirklich im Monat? Sieh deine Monatsrate, die gesamten Zinsen und wie deine Restschuld mit der Zeit sinkt.
  - 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/de/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/de/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.)
- [Browserinfo](https://how.box/de/web/my-browser/): Wie identifiziert sich dein Browser? Gemeldete Fakten zu Browser, Engine und Gerät.
  - 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/de/web/my-browser/?facet={facet} (facet: identity, update, agent, display, chrome or tesla), e.g. https://how.box/de/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 [Browser-Updateprüfung](https://how.box/de/web/is-my-browser-up-to-date/): Ist mein Browser aktuell? The same tool, preconfigured.
  - Preset [Browsererkennung](https://how.box/de/web/what-browser-am-i-using/): Welchen Browser nutze ich? The same tool, preconfigured.
  - Preset [Mein User Agent](https://how.box/de/web/my-user-agent/): Wie lautet meine User-Agent-Zeichenfolge? The same tool, preconfigured.
  - Preset [Meine Bildschirmauflösung](https://how.box/de/web/my-screen-resolution/): Welche Bildschirmauflösung habe ich? The same tool, preconfigured.
  - Preset [Chrome-Version](https://how.box/de/web/chrome-version/): Welche Chrome-Version habe ich? The same tool, preconfigured.
  - Preset [Tesla-Browser](https://how.box/de/web/tesla-browser/): Welche Chrome-Version nutzt der Browser meines Tesla? The same tool, preconfigured.
- [Nettogehaltsrechner](https://how.box/de/finance/net-salary/): Wie viel bleibt dir von deinem Gehalt netto? Vom Brutto zum Netto in Deutschland, Estland oder Finnland, mit allen Steuern und Abgaben.
  - 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/de/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/de/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 (Deutschland), EE (Estland), FI (Finnland).
  - 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 [Brutto-Netto-Rechner](https://how.box/de/finance/brutto-netto-rechner/): Wie viel bleibt von deinem Bruttogehalt in Deutschland? The same tool, preconfigured.
  - Preset [Gehaltsrechner für Estland](https://how.box/de/finance/palgakalkulaator/): Wie viel netto bleibt von einem estnischen Bruttogehalt? The same tool, preconfigured.
  - Preset [Nettogehaltsrechner für Finnland](https://how.box/de/finance/nettopalkka/): Wie viel netto bleibt von einem finnischen Bruttogehalt? The same tool, preconfigured.
- [Notenfrequenz](https://how.box/de/music/note-frequency/): Welche Frequenz hat ein Ton? Rechne Noten in Hertz oder Frequenzen in den nächsten Ton um, mit Cent-Abweichung, MIDI-Nummer, Oktavtabelle und Klang.
  - 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/de/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/de/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 [Notennamen](https://how.box/de/music/note-names/): Wie heißen die Töne in anderen Sprachen? The same tool, preconfigured.
- [Kapitalwert- und IRR-Rechner](https://how.box/de/finance/npv/): Wie viel ist eine Investition heute wert? Zinse jährliche Cashflows auf den heutigen Wert ab und finde den Zinssatz, bei dem sich die Investition genau trägt.
  - 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/de/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/de/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).)
- [Zahlensysteme umrechnen](https://how.box/de/math/number-base/): Wie rechnest du Zahlen zwischen Zahlensystemen um? Rechne ganze Zahlen zwischen Binär, Oktal, Dezimal, Hexadezimal und jeder Basis bis 36 um.
  - 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/de/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/de/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 [Hex in Dezimal](https://how.box/de/math/hex-to-decimal/): Was ist eine Hexadezimalzahl im Dezimalsystem? The same tool, preconfigured.
- [Ohmsches-Gesetz-Rechner](https://how.box/de/physics/ohms-law/): Wie viel Strom fließt, und wie viel Leistung wird verbraucht? Gib zwei der Größen Spannung, Strom, Widerstand und Leistung ein und erhalte die anderen zwei.
  - 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/de/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/de/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.)
- [Alte Währungen umrechnen](https://how.box/de/finance/old-currency/): Wie viel ist altes Geld heute in Euro wert? Markka, Deutsche Mark, Franc, Lira und alle anderen früheren Euro-Währungen zum festen Kurs, die Markka auch in heutigem Geldwert.
  - 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/de/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/de/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 [Mummonmarkka-Rechner](https://how.box/de/finance/mummonmarkka/): Wie viel ist das in Markka? The same tool, preconfigured.
  - Preset [Inflationsrechner für Finnland](https://how.box/de/finance/inflation/): Wie viel sind 100 € von 2005 heute wert? The same tool, preconfigured.
- [1RM-Rechner](https://how.box/de/health/one-rep-max/): Wie viel könntest du für eine Wiederholung heben? Dein geschätztes Ein-Wiederholungs-Maximum aus einem absolvierten Satz, mit den Gewichten für 1 bis 12 Wiederholungen, nach Epley oder 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/de/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/de/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.)
- [Pace-Rechner](https://how.box/de/health/pace/): Wie schnell musst du laufen? Rechne Zielzeit in Pace und Geschwindigkeit oder Pace in Zielzeit um, mit Zwischenzeiten je Kilometer oder Meile.
  - 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/de/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/de/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 [Marathon-Pace-Rechner](https://how.box/de/health/marathon-pace/): Welche Pace brauchst du für deine Marathon-Zielzeit? The same tool, preconfigured.
  - Preset [Halbmarathon-Pace-Rechner](https://how.box/de/health/half-marathon-pace/): Welche Pace brauchst du für deine Halbmarathon-Zielzeit? The same tool, preconfigured.
- [Farbrechner](https://how.box/de/everyday/paint/): Wie viel Farbe brauche ich für einen Raum? Liter oder Gallonen Wandfarbe und die Zahl der Eimer, aus Raumgröße, Anstrichen und der Ergiebigkeit auf dem Eimer.
  - 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/de/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/de/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.)
- [Papierformate](https://how.box/de/conversion/paper-size/): Wie groß ist dieses Papierformat? Sieh die A-, B- und C-Reihen sowie US Letter, Legal und Tabloid in Millimetern, Zentimetern, Zoll oder Punkt nach.
  - 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/de/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/de/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.)
- [Passbild](https://how.box/de/media/passport-photo/): Wie bekommst du ein Passbild in die richtige Größe? Schneide dein eigenes Foto auf das amtliche Passbildformat zu, mit Hilfslinien für den Kopf, und speichere es als Datei oder Druckbogen. Es verlässt dein Gerät nie.
  - 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/de/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/de/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.)
- [Passwortgenerator](https://how.box/de/web/password/): Wie stark soll dein neues Passwort sein? Ein zufälliges Passwort auf deinem Gerät, mit Stärke in Bit. Nichts wird versendet.
  - 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/de/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/de/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.)
- [Prozentrechner](https://how.box/de/math/percentage/): Wie viel ist das in Prozent? Prozentwert, prozentualer Anteil, Änderung und Unterschied sowie der ursprüngliche Wert vor einem Rabatt.
  - 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/de/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/de/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 [Rechner für prozentuale Veränderung](https://how.box/de/math/percentage-change/): Um wie viel Prozent ist der Wert gestiegen oder gesunken? The same tool, preconfigured.
- [Haustieralter berechnen](https://how.box/de/everyday/pet-age/): Wie alt ist dein Haustier in Menschenjahren? Hunde- oder Katzenalter in Menschenjahren nach heutiger Forschung statt der alten ×7-Regel, mit Lebensphase.
  - 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/de/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/de/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 [Hundealter berechnen](https://how.box/de/everyday/dog-age/): Wie alt ist dein Hund in Menschenjahren? The same tool, preconfigured.
  - Preset [Katzenalter berechnen](https://how.box/de/everyday/cat-age/): Wie alt ist deine Katze in Menschenjahren? The same tool, preconfigured.
- [Klavier](https://how.box/de/music/piano/): Wie wäre es, hier direkt Klavier zu spielen? Spiele zwei Oktaven mit Maus, Touch, Computertastatur oder MIDI-Keyboard, mit gehaltenen Tönen und Notennamen.
  - 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/de/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/de/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).)
- [Zufällige Namensauswahl](https://how.box/de/everyday/picker/): Wer wird ausgelost? Drehe das Rad, um Gewinner aus deiner Liste zu ziehen, oder teile alle fair in Teams auf.
  - 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/de/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/de/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).)
- [Pomodoro-Timer](https://how.box/de/datetime/pomodoro/): Wie lange möchtest du dich vor einer Pause konzentrieren? Fokusphasen und Pausen im Wechsel, jeweils mit einem Signal am Ende.
  - 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/de/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/de/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.)
- [Leistungsumrechner](https://how.box/de/conversion/power/): Wie viel ist diese Leistung in anderen Einheiten? Rechne zwischen Watt, Kilowatt, Megawatt, mechanischen und metrischen Pferdestärken sowie BTU pro Stunde mit exakten Definitionen um.
  - 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/de/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/de/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 [Pferdestärken in Kilowatt](https://how.box/de/conversion/hp-to-kw/): Wie viele Kilowatt hat eine mechanische Pferdestärke? The same tool, preconfigured.
- [PPI-Rechner für Bildschirme](https://how.box/de/media/ppi/): Wie scharf ist dein Bildschirm? Gib Auflösung und Bildschirmgröße ein, um Pixel pro Zoll, Pixelabstand und die tatsächlichen Abmessungen zu berechnen.
  - 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/de/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/de/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.)
- [Barwertrechner](https://how.box/de/finance/present-value/): Wie viel ist künftiges Geld heute wert? Zinse einen künftigen Betrag zu einem Satz deiner Wahl auf den heutigen Wert ab.
  - 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/de/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/de/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.)
- [Druckumrechner](https://how.box/de/conversion/pressure/): Wie hoch ist dieser Druck in anderen Einheiten? Rechne zwischen Pascal, Hektopascal, Kilopascal, bar, psi, Atmosphären, mmHg und inHg um.
  - 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/de/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/de/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).)
- [Primzahltest](https://how.box/de/math/prime/): Ist deine Zahl eine Primzahl? Prüfe ganze Zahlen mit bis zu 100 Ziffern auf Primzahleigenschaft, mit Primfaktoren sowie nächster und vorheriger Primzahl.
  - 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/de/math/prime/?n={n} (n: text), e.g. https://how.box/de/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?)
- [Gewinnrad](https://how.box/de/everyday/prize-wheel/): Was wirst du gewinnen? Trage Preise ein, drehe das Rad und verlose sie nacheinander: eine faire Ziehung für Tombolas, Partys und Veranstaltungen.
  - 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/de/everyday/prize-wheel/?p={p}&c={c}&r={r} (p: text; c: whole number 5 to 100; r: boolean), e.g. https://how.box/de/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.)
- [Promillerechner](https://how.box/de/health/promille/): Wie viel Alkohol hast du im Blut? Eine grobe Schätzung deines Blutalkohols in Promille (‰) und wie lange dein Körper braucht, um ihn abzubauen, nach der Widmark-Formel.
  - 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/de/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/de/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.)
- [QR-Code-Generator](https://how.box/de/media/qr-code/): Wie erstelle ich einen QR-Code? Statische Codes direkt auf deinem Gerät: ohne Ablaufdatum, Weiterleitung oder Scan-Tracking.
  - 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/de/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/de/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 [WLAN-QR-Code](https://how.box/de/media/wifi-qr/): Wie erstelle ich einen QR-Code für mein WLAN? The same tool, preconfigured.
  - Preset [Kontakt-QR-Code (vCard)](https://how.box/de/media/vcard-qr/): Wie speichere ich meine Kontaktdaten in einem QR-Code? The same tool, preconfigured.
  - Preset [E-Mail-QR-Code](https://how.box/de/media/email-qr/): Wie erstelle ich einen QR-Code zum Schreiben einer E-Mail? The same tool, preconfigured.
  - Preset [SMS-QR-Code](https://how.box/de/media/sms-qr/): Wie erstelle ich einen QR-Code zum Senden einer SMS? The same tool, preconfigured.
  - Preset [Termin-QR-Code](https://how.box/de/media/event-qr/): Wie erstelle ich einen QR-Code für einen Kalendertermin? The same tool, preconfigured.
  - Preset [Standort-QR-Code](https://how.box/de/media/geo-qr/): Wie erstelle ich einen QR-Code für einen Standort? The same tool, preconfigured.
  - Preset [Zahlungs-QR-Code (EPC-QR)](https://how.box/de/media/payment-qr/): Wie erstelle ich einen QR-Code für eine Überweisung? The same tool, preconfigured.
- [Zufallszahl](https://how.box/de/everyday/random-number/): Welche Zahl wird der Zufall wählen? Faire Zufallszahlen aus dem sicheren Generator deines Geräts, mit oder ohne Wiederholungen.
  - 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/de/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/de/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 [Münzwurf](https://how.box/de/everyday/coin-flip/): Kopf oder Zahl? The same tool, preconfigured.
- [Verhältnisrechner](https://how.box/de/math/ratio/): Wie kürzt du ein Verhältnis oder findest die fehlende Zahl? Kürze ein Verhältnis vollständig oder finde mit dem Dreisatz die fehlende Zahl in einem gleichen Verhältnis.
  - 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/de/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/de/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).)
- [Referenznummer-Generator](https://how.box/de/finance/reference-number/): Wie erstelle ich eine gültige Referenznummer? Erstelle eine finnische Referenznummer mit Prüfziffer oder prüfe eine – auch in der RF-Form.
  - 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/de/finance/reference-number/?m={m}&r={r}&b={b} (m: check or create; r: text; b: text), e.g. https://how.box/de/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 (Finnland).
  - 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.)
- [Umschuldungsrechner](https://how.box/de/finance/refinance/): Wie viel könntest du durch eine Umschuldung sparen? Vergleiche die neue Rate mit Abschlusskosten und den verbleibenden Zinsen deines aktuellen Kredits.
  - 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/de/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/de/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.)
- [Mieten-oder-Kaufen-Rechner](https://how.box/de/finance/rent-vs-buy/): Ist es besser, dein Zuhause zu mieten oder zu kaufen? Vergleiche Mieten und Kaufen über die Jahre, die du bleiben willst – mit allen Annahmen im Blick.
  - 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/de/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/de/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).)
- [Widerstand-Farbcode-Rechner](https://how.box/de/physics/resistor/): Wie liest man die Farbringe eines Widerstands? Mach aus 4, 5 oder 6 Farbringen Ohm und Toleranz, oder finde die Ringe zu einem Wert.
  - 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/de/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/de/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).)
- [ROI-Rechner](https://how.box/de/finance/roi/): Wie viel Rendite hat deine Geldanlage gebracht? Sieh die Gesamtrendite, den Gewinn und die jährliche Rendite, der sie entspricht.
  - 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/de/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/de/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 [CAGR-Rechner](https://how.box/de/finance/cagr/): Wie schnell ist es pro Jahr gewachsen? The same tool, preconfigured.
- [Römische Zahlen umrechnen](https://how.box/de/conversion/roman/): Wie schreibst du das in römischen Zahlen? Wandle Zahlen in römische Ziffern oder römische Ziffern in Zahlen um, in der Standardform von 1 bis 3999.
  - 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/de/conversion/roman/?v={v} (v: text), e.g. https://how.box/de/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).)
- [Gehaltsumrechner](https://how.box/de/finance/salary/): Wie hoch ist dein Gehalt in einem anderen Zeitraum? Vergleiche Bruttogehälter anhand deiner eigenen Arbeitszeiten.
  - 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/de/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/de/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.)
- [Stichprobengröße berechnen](https://how.box/de/math/sample-size/): Wie viele Antworten braucht deine Umfrage? Wie viele Umfrageantworten du für eine Fehlermarge und ein Konfidenzniveau brauchst, für jede Größe der Grundgesamtheit.
  - 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/de/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/de/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.)
- [Sparzielrechner](https://how.box/de/finance/savings-goal/): Wie viel musst du für dein Sparziel zurücklegen? Berechne die monatliche oder jährliche Einzahlung, mit der dein Erspartes rechtzeitig das Ziel erreicht.
  - 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/de/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/de/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.)
- [Wissenschaftlicher Taschenrechner](https://how.box/de/math/scientific/): Wie viel ergibt das? Tippe eine Rechnung ein oder nutze die Tasten.
  - 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/de/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/de/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.)
- [Wissenschaftliche Schreibweise umrechnen](https://how.box/de/math/scientific-notation/): Wie schreibst du diese Zahl in wissenschaftlicher Schreibweise? Schreibe Zahlen wissenschaftlich oder technisch mit gewünschter Stellenzahl oder wandle 6.022e23 zurück in Ziffern um.
  - 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/de/math/scientific-notation/?n={n}&s={s} (n: text; s: whole number 1 to 20), e.g. https://how.box/de/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.)
- [Winkeralphabet](https://how.box/de/text/semaphore/): Wie schreibst du deinen Namen im Winkeralphabet? Wandle Text in Winkeralphabet-Figuren um oder lies einen Buchstaben aus den beiden Armstellungen ab.
  - 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/de/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/de/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.)
- [Reihen- und Parallelschaltung](https://how.box/de/physics/series-parallel/): Wie addieren sich Widerstände und Kondensatoren? Kombiniere 2 bis 12 Widerstände oder Kondensatoren und sieh den Gesamtwert.
  - 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/de/physics/series-parallel/?k={k}&a={a}&p={p} (k: resistor or capacitor; a: series or parallel; p: array), e.g. https://how.box/de/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.)
- [Flächeninhalt von Figuren](https://how.box/de/math/shape-area/): Wie groß ist die Fläche dieser Figur? Fläche und Umfang von Rechteck, Kreis, Dreieck und acht weiteren Figuren, maßstabsgetreu gezeichnet.
  - 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/de/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/de/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).)
- [Volumen von Körpern](https://how.box/de/math/shape-volume/): Wie viel passt in diesen Körper? Volumen und Oberfläche von Quader, Zylinder, Kugel, Kegel und sieben weiteren Körpern, auch in Litern und Gallonen.
  - 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/de/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/de/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 [Poolvolumen](https://how.box/de/math/pool/): Wie viel Wasser passt in den Pool? The same tool, preconfigured.
- [Schuhgrößen umrechnen](https://how.box/de/conversion/shoe-size/): Wie entspricht deine Schuhgröße anderen Größensystemen? Vergleiche Referenzgrößen für Erwachsene und Kinder.
  - 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/de/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/de/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.)
- [Schlafzyklus-Rechner](https://how.box/de/health/sleep/): Wie kannst du deinen Schlaf planen? Finde Schlafens- oder Aufwachzeiten anhand eines ungefähren 90-Minuten-Zyklus.
  - 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/de/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/de/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).)
- [Geschwindigkeit umrechnen](https://how.box/de/conversion/speed/): Wie schnell ist das in anderen Einheiten? Rechne zwischen Kilometern pro Stunde, Meilen pro Stunde, Metern pro Sekunde, Knoten und Fuß pro Minute um.
  - 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/de/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/de/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 in mph](https://how.box/de/conversion/kmh-to-mph/): Wie viele Meilen pro Stunde sind 100 km/h? The same tool, preconfigured.
- [Rechnung aufteilen](https://how.box/de/everyday/split-bill/): Wie viel soll jede Person bezahlen? Teile eine Rechnung nach ungleichen Anteilen auf, bis auf den letzten Cent. Alle Anteile ergeben immer die Gesamtsumme.
  - 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/de/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/de/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.)
- [Squawk-Codes](https://how.box/de/aviation/squawk/): Was bedeutet Squawk 7700? Schlage Transpondercodes nach: die Notfallcodes 7500, 7600 und 7700 sowie VFR- und IFR-Codes nach Ländern, jeweils mit der maßgeblichen Vorschrift.
  - 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/de/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/de/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.)
- [SSL-Zertifikat prüfen](https://how.box/de/web/ssl/): Ist dein SSL-Zertifikat gültig und vertrauenswürdig? Ablaufdatum, Aussteller, abgedeckte Namen, Zertifikatskette und TLS-Version öffentlicher Websites, mit verständlichen Lösungsvorschlägen.
  - 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/de/web/ssl/?h={h}&p={p} (h: text; p: 443, 465, 636, 853, 993, 995 or 8443), e.g. https://how.box/de/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).)
- [Standardatmosphäre (ISA)](https://how.box/de/aviation/standard-atmosphere/): Wie ändern sich Temperatur, Druck und Dichte mit der Höhe? Die ICAO-Standardatmosphäre für jede Höhe oder Flugfläche, am Standardtag oder bei wärmerer oder kälterer Luft.
  - 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/de/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/de/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).)
- [Standardabweichung berechnen](https://how.box/de/math/standard-deviation/): Wie stark streuen diese Zahlen? Standardabweichung und Varianz einer Zahlenliste für Stichprobe oder Grundgesamtheit, mit Mittelwert und Standardfehler.
  - 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/de/math/standard-deviation/?v={v}&k={k} (v: text; k: sample or population), e.g. https://how.box/de/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.)
- [Stoppuhr](https://how.box/de/datetime/stopwatch/): Wie lange hat es gedauert? Starten, Runde nehmen, stoppen: Jede Zwischenzeit bleibt erhalten.
  - 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/de/datetime/stopwatch/?f={f} (f: segments), e.g. https://how.box/de/datetime/stopwatch/?f=segments. Served answer coverage: none (computed in the browser)
  - Runs entirely in the browser. Tags: calculator, fitness.
  - Agent tools: none
- [Studienkredit-Tilgungsrechner](https://how.box/de/finance/student-loan/): Wie viel zahlst du für deinen Studienkredit zurück? Sieh die Monatsrate und die Zinsen insgesamt, mit der finnischen Kela-Gutschrift und dem Zinszuschuss, wenn sie gelten.
  - 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/de/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/de/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.)
- [Sonnenaufgang und Sonnenuntergang](https://how.box/de/datetime/sunrise/): Wann geht die Sonne auf und unter? Sonnenaufgang, Sonnenuntergang, Sonnenhöchststand, Tageslänge und Dämmerung für jeden Ort und jedes Datum anhand seiner Koordinaten.
  - 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/de/datetime/sunrise/?lat={lat}&lon={lon}&d={d}&z={z} (lat: text; lon: text; d: text; z: text), e.g. https://how.box/de/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).)
- [Synthesizer](https://how.box/de/music/synth/): Wie klingt deine Melodie auf einem Synthesizer? Spiele und forme einen Synthesizerklang mit Wellenform, Hüllkurve, Filter und LFO per Maus, Touch, Computertastatur oder MIDI-Keyboard.
  - 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/de/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/de/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).)
- [CO₂-Rechner fürs Auto](https://how.box/de/vehicles/tailpipe-co2/): Wie viel CO₂ stößt dein Auto aus? Gramm CO₂ pro Kilometer oder Meile und Kilogramm pro Jahr, aus dem, was dein Benziner oder Diesel verbraucht.
  - 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/de/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/de/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.)
- [Temperaturumrechner](https://how.box/de/conversion/temperature/): Wie warm oder kalt ist das auf anderen Skalen? Celsius, Fahrenheit, Kelvin, Rankine und Gas Mark exakt umrechnen.
  - 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/de/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/de/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 in Fahrenheit](https://how.box/de/conversion/celsius-to-fahrenheit/): Wie rechnest du Celsius in Fahrenheit um? The same tool, preconfigured.
  - Preset [Fahrenheit in Celsius](https://how.box/de/conversion/fahrenheit-to-celsius/): Wie rechnest du Fahrenheit in Celsius um? The same tool, preconfigured.
- [Textvergleich](https://how.box/de/text/text-diff/): Wie unterscheiden sich diese Texte? Sieh Ergänzungen und Löschungen, Zeile für Zeile oder Wort für Wort.
  - 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/de/text/text-diff/?mode={mode}&case={case}&space={space} (mode: lines or words; case: boolean; space: boolean), e.g. https://how.box/de/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.)
- [Fliesenrechner](https://how.box/de/everyday/tiles/): Wie viele Fliesen brauche ich? Fliesen und Kartons, Laminatpakete oder Tapetenrollen für Boden oder Wand, mit Zuschlag für Verschnitt.
  - 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/de/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/de/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 [Laminatrechner](https://how.box/de/everyday/flooring/): Wie viel Laminat brauche ich? The same tool, preconfigured.
  - Preset [Tapetenrechner](https://how.box/de/everyday/wallpaper/): Wie viele Tapetenrollen brauche ich? The same tool, preconfigured.
- [Countdown-Timer](https://how.box/de/datetime/timer/): Wie viel Zeit bleibt noch? Ein wenig Zeit, klar gezählt.
  - 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/de/datetime/timer/?d={d}&f={f} (d: whole number 1000 to 3.59999e8; f: segments), e.g. https://how.box/de/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 [Eieruhr](https://how.box/de/datetime/egg-timer/): Wie lange solltest du ein Ei kochen? The same tool, preconfigured.
- [Einmaleins üben](https://how.box/de/kids/times-tables/): Wie gut kennst du dein Einmaleins? Wähle deine Reihen. Lass dir Zeit, versuche es erneut und sieh, wie viel du schon weißt.
  - 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/de/kids/times-tables/?n={n} (n: text), e.g. https://how.box/de/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
- [Zeitzonenrechner](https://how.box/de/datetime/timezone/): Wie spät ist es dort, wenn es hier diese Uhrzeit ist? Eine Uhrzeit auf einmal in mehrere Zeitzonen umgerechnet, mit Datum, Zeitverschiebung und Sommerzeit an diesem Tag.
  - 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/de/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/de/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 [Zeitverschiebung](https://how.box/de/datetime/time-difference/): Wie viele Stunden Zeitverschiebung liegen zwischen zwei Orten? The same tool, preconfigured.
  - Preset [Zeitzonenliste](https://how.box/de/datetime/tz-list/): Welche UTC-Abweichung hat jede Zeitzone? The same tool, preconfigured.
- [Trinkgeldrechner](https://how.box/de/everyday/tip/): Wie hoch ist das Trinkgeld und was zahlt jede Person? Addiere Trinkgeld zur Rechnung und teile die Gesamtsumme unter mehreren Personen auf, centgenau.
  - 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/de/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/de/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.)
- [Trinkgeld nach Land](https://how.box/de/everyday/tipping/): Wie viel Trinkgeld gibt man im Ausland? Trinkgeldregeln für Restaurant, Taxi und Hotel nach Land, von offiziellen Tourismusseiten, mit Trinkgeld und Gesamtbetrag für deine Rechnung.
  - 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/de/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/de/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.)
- [Tongenerator](https://how.box/de/physics/tone/): Wie klingt diese Frequenz? Spiele einen Testton von 1 Hz bis 20 kHz und sieh Tonname, Periodendauer und Wellenlänge.
  - 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/de/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/de/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.)
- [Drehmomentumrechner](https://how.box/de/conversion/torque/): Wie viel Drehmoment ist das in anderen Einheiten? Rechne zwischen Newtonmetern, Foot-Pounds, Inch-Pounds, Kilopondmetern und weiteren Einheiten um.
  - 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/de/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/de/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 [Newtonmeter in Foot-Pounds](https://how.box/de/conversion/nm-to-ft-lb/): Wie viele Foot-Pounds sind ein Newtonmeter? The same tool, preconfigured.
- [Spielzeugklavier](https://how.box/de/kids/toy-piano/): Wie wäre es mit einem Lied auf dem Spielzeugklavier? Große bunte Tasten mit Spielzeugklavier-, Xylofon- und Marimbaklängen. Bei Liedern leuchtet die nächste Taste auf.
  - 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/de/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/de/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.)
- [Übertragungssteuer-Rechner](https://how.box/de/finance/transfer-tax/): Wie viel Übertragungssteuer zahlst du in Finnland beim Wohnungskauf? Die finnische Übertragungssteuer auf eine Wohnung, eine Immobilie oder Anteile, zu den Sätzen am Tag deines Vertrags.
  - 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/de/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/de/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 (Finnland).
  - Agent tools: `transfer_tax_calculate` (Finland only: the transfer tax (varainsiirtovero) one buyer pays, by Varainsiirtoverolaki 931/1996 and the contract date.)
- [Dreiecksrechner](https://how.box/de/math/triangle/): Wie berechne ich ein Dreieck? Gib drei Stücke eines Dreiecks an und erhalte die anderen drei, die Fläche und eine maßstabsgetreue Zeichnung, auch wenn es zwei Lösungen gibt.
  - 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/de/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/de/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).)
- [Stimmgerät](https://how.box/de/music/tuner/): Ist dein Instrument richtig gestimmt? Spiele einen Ton nahe am Mikrofon. Sieh den nächsten Ton, Abweichung in Cent und Frequenz. Der Klang bleibt auf deinem Gerät.
  - 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/de/music/tuner/?i={i}&a={a} (i: chromatic, guitar, bass, ukulele or violin; a: number 400 to 480), e.g. https://how.box/de/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).)
- [Tipptest](https://how.box/de/text/typing-test/): Wie schnell kannst du tippen? Dein Schreibtempo in Wörtern pro Minute, mit Genauigkeit und den Tasten, bei denen du dich am häufigsten vertippst.
  - 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/de/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/de/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.)
- [Grundpreise vergleichen](https://how.box/de/finance/unit-price/): Wie findest du die günstigste Packung pro Kilo oder Liter? Vergleiche unterschiedlich große Packungen nach Preis pro Kilogramm, Liter oder Stück.
  - 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/de/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/de/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.)
- [Unix-Zeitstempel umrechnen](https://how.box/de/datetime/unix-time/): Wie wandelst du einen Unix-Zeitstempel in ein Datum um? Wandle Unix-Zeitstempel in Datumsangaben und Datumsangaben in Zeitstempel um, in jeder Zeitzone.
  - 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/de/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/de/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.)
- [URL kodieren und dekodieren](https://how.box/de/web/url-encode/): Wie kodierst du Text für eine Webadresse? Kodiere Text für Webadressen mit Prozentzeichen oder wandle %20 und andere Codes zurück in Klartext um.
  - 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/de/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/de/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).)
- [UUID-Generator](https://how.box/de/web/uuid/): Wie erzeugst du eine neue UUID? Zufällige UUIDs der Version 4 oder zeitlich sortierbare Version 7, direkt auf deinem Gerät.
  - 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/de/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/de/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).)
- [Mehrwertsteuerrechner](https://how.box/de/finance/vat/): Wie viel Mehrwertsteuer steckt im Preis? Schlage Mehrwertsteuer auf oder rechne sie heraus, mit regulären und ermäßigten Steuersätzen deines Landes.
  - 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/de/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/de/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 [Mehrwertsteuerrechner Großbritannien](https://how.box/de/finance/uk-vat/): Wie viel Mehrwertsteuer steckt in einem britischen Preis? The same tool, preconfigured.
  - Preset [Mehrwertsteuerrechner Österreich](https://how.box/de/finance/austria-vat/): Wie viel Mehrwertsteuer steckt in einem österreichischen Preis? The same tool, preconfigured.
  - Preset [Mehrwertsteuerrechner Schweiz](https://how.box/de/finance/swiss-vat/): Wie viel Mehrwertsteuer steckt in einem Schweizer Preis? The same tool, preconfigured.
- [Volumenumrechner](https://how.box/de/conversion/volume/): Wie viel ist das in anderen Volumeneinheiten? Rechne zwischen Millilitern, Litern, Kubikmetern, US-Gallonen und britischen Gallonen exakt um.
  - 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/de/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/de/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 [Liter in US-Gallonen](https://how.box/de/conversion/litres-to-gallons/): Wie viele US-Gallonen sind ein Liter? The same tool, preconfigured.
- [Taille-Größe-Verhältnis berechnen](https://how.box/de/health/waist-height/): Ist deine Taille kleiner als deine halbe Körpergröße? Dein Taille-Größe-Verhältnis und was es über Bauchfett aussagt, mit den NICE-Bereichen und der Regel „Taille unter halber Größe“.
  - 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/de/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/de/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).)
- [Webcam-Test](https://how.box/de/media/webcam-test/): Funktioniert meine Webcam? Drücke Start, um dein Kamerabild live mit Bildgröße und Bildrate zu sehen.
  - 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/de/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/de/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.)
- [Kalenderwoche](https://how.box/de/datetime/week-number/): Welche Kalenderwoche ist heute? Die heutige ISO-Kalenderwoche, die Woche eines beliebigen Datums und die Daten jeder Woche.
  - 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/de/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/de/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.)
- [Gewichtsumrechner](https://how.box/de/conversion/weight/): Wie viel wiegt das in anderen Einheiten? Rechne Kilogramm, Gramm, Pfund, Unzen, Stone, Tonnen, Karat und weitere Einheiten exakt um.
  - 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/de/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/de/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 [Kilogramm in Pfund](https://how.box/de/conversion/kg-to-lb/): Wie viele Pfund sind ein Kilogramm? The same tool, preconfigured.
  - Preset [Pfund in Kilogramm](https://how.box/de/conversion/lb-to-kg/): Wie viele Kilogramm hat ein Pfund (lb)? The same tool, preconfigured.
- [Was ist meine IP?](https://how.box/de/web/what-is-my-ip/): Wie sieht das Internet deine Verbindung? Deine öffentliche IP und das Netzwerk dahinter.
  - 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/de/web/what-is-my-ip/?view={view} (view: ip, ipv6, isp or location), e.g. https://how.box/de/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 [Habe ich IPv6?](https://how.box/de/web/do-i-have-ipv6/): Nutzt diese Verbindung IPv6? The same tool, preconfigured.
  - Preset [Mein Internetanbieter](https://how.box/de/web/my-isp/): Welches Netzwerk trägt deine Verbindung? The same tool, preconfigured.
  - Preset [IP-Standort](https://how.box/de/web/ip-location/): Wo scheint deine IP zu liegen? The same tool, preconfigured.
- [WHOIS-Abfrage](https://how.box/de/web/whois/): Wie ist diese Domain registriert? Finde Registrar, Datumsangaben und Nameserver aus 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/de/web/whois/?d={d} (d: text), e.g. https://how.box/de/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.)
- [WLAN-Karte](https://how.box/de/printables/wifi-card/): Wie teile ich mein WLAN mit Gästen? Eine druckbare Karte mit QR-Code, über den Gäste per Smartphone-Kamera deinem WLAN beitreten.
  - 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/de/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/de/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.)
- [Windchill und Hitzeindex](https://how.box/de/earth/wind-chill/): Wie kalt oder heiß fühlt es sich draußen wirklich an? Die gefühlte Temperatur: Windchill bei Kälte, Hitzeindex bei Hitze.
  - 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/de/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/de/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.)
- [Beaufort-Skala](https://how.box/de/conversion/wind-scale/): Wie stark ist der Wind auf der Beaufort-Skala? Wandle eine Windgeschwindigkeit in m/s, km/h, Knoten oder mph in Windstärke und Bezeichnung nach Beaufort um.
  - 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/de/conversion/wind-scale/?s={s}&u={u} (s: number 0 to 1000; u: ms, kmh, kt or mph), e.g. https://how.box/de/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).)
- [Winddreieck-Rechner](https://how.box/de/aviation/wind-triangle/): Welchen Steuerkurs und welche Geschwindigkeit über Grund ergibt dieser Wind? Steuerkurs, Windkorrekturwinkel und Geschwindigkeit über Grund für Kurs und Wind, mit Streckenzeit, Kraftstoffbedarf und gezeichnetem Winddreieck.
  - 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/de/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/de/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.)
- [AWG-Umrechner](https://how.box/de/conversion/wire-gauge/): Wie viel mm² hat dieser AWG-Draht? Rechne AWG in mm², kcmil und Durchmesser um, mit dem Kupferwiderstand pro Kilometer.
  - 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/de/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/de/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).)
- [Wörter zählen](https://how.box/de/text/word-count/): Wie lang ist dein Text? Wörter, Zeichen und Lesezeit direkt beim Tippen.
  - 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/de/text/word-count/? (), e.g. https://how.box/de/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.)
- [Arbeitstage in Finnland](https://how.box/de/datetime/working-days/): Wie viele Arbeitstage liegen in Finnland zwischen zwei Daten? Zähle finnische Arbeitstage zwischen zwei Daten oder addiere Arbeitstage zu einem Datum.
  - 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/de/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/de/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 (Finnland).
  - 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).)
- [Weltzeituhr](https://how.box/de/datetime/world-clock/): Wie spät ist es in New York, London und Tokio? Live-Uhren für deine Städte, mit Datum, UTC-Versatz, Zeitunterschied zu dir und Tag oder Nacht.
  - 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/de/datetime/world-clock/?z={z}&at={at} (z: text; at: text), e.g. https://how.box/de/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.)
- [z-Wert berechnen](https://how.box/de/math/z-score/): Wie ungewöhnlich ist dieser Wert? z-Wert und Perzentil eines Werts in einer Normalverteilung, der Wert bei einem Perzentil oder die Wahrscheinlichkeit zwischen zwei Werten.
  - 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/de/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/de/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).)
- [Zulu-Zeit](https://how.box/de/datetime/zulu-time/): Wie spät ist es in Zulu-Zeit (UTC)? Die aktuelle Zulu-Zeit und die Umrechnung zwischen Zulu- und Ortszeit, mit der in der Luftfahrt verwendeten Tag-Zeit-Gruppe.
  - 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/de/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/de/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.)

## About

- https://how.box/de/about/accessibility/
- https://how.box/de/about/privacy/
- https://how.box/de/about/terms/
- https://how.box/de/about/agents/

## Optional

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