# 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/en-us/agent-tools.json): descriptions and input schemas - [Catalog](https://how.box/en-us/catalog.json): utilities and answer-link parameters - [Full text](https://how.box/en-us/llms-full.txt): explanations and FAQ - [Agent terms and limits](https://how.box/en-us/about/agents/) ## Tools - [A/B test significance calculator](https://how.box/en-us/finance/ab-test/): Is your A/B test result real or just chance? Conversion rates, lift, p-value and the confidence interval of an A/B test, with the sample size it needs. - 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/en-us/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/en-us/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).) - [Exact age](https://how.box/en-us/datetime/age/): How old are you, exactly? Your age in years, months and days, the totals and your next birthday. - 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/en-us/datetime/age/?b={b}&d={d} (b: text; d: text), e.g. https://how.box/en-us/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/en-us/aviation/airline-codes/): Which airline is this code? Find any airline by its IATA or ICAO code, radio call sign or name: both codes, call sign, country and whether it still flies. - 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/en-us/aviation/airline-codes/?q={q}&s={s}&c={c} (q: text; s: (empty), current or defunct; c: text), e.g. https://how.box/en-us/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.) - [Airport codes](https://how.box/en-us/aviation/airport-codes/): What airport is this code? Find any airport by its IATA or ICAO code, name or city: codes, location, elevation and scheduled service. - 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/en-us/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/en-us/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).) - [Airspeed converter](https://how.box/en-us/aviation/airspeed/): How do IAS, CAS, TAS and Mach relate? Indicated, true and equivalent airspeed and Mach number at any altitude and temperature, with the 2% rule of thumb beside the exact answer. - 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/en-us/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/en-us/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.) - [Altimeter settings](https://how.box/en-us/aviation/altimeter/): How do QNH, QFE and flight levels relate? Altitude on QNH, flight level and QFE side by side, with hPa ↔ inHg ↔ mmHg, the transition level, cruising levels and the cold-temperature correction. - 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/en-us/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/en-us/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).) - [Angle converter](https://how.box/en-us/conversion/angle/): How many radians is that angle? Convert between degrees, radians, gradians, arcminutes, arcseconds, turns and mils. - 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/en-us/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/en-us/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 [Degrees to radians](https://how.box/en-us/conversion/degrees-to-radians/): How do you convert degrees to radians? The same tool, preconfigured. - [APR calculator](https://how.box/en-us/finance/apr/): How much does your loan really cost per year? Turn the interest rate and the fees of a loan into one annual percentage rate (APR) by the EU formula. - 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/en-us/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/en-us/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.) - [Area converter](https://how.box/en-us/conversion/area/): How big is that in other area units? Convert between square metres, hectares, acres, square feet, square miles and more, exactly. - 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/en-us/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/en-us/conversion/area/?v=1&from=m2&to=ft2. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser) - Runs entirely in the browser. Tags: converter, area, metric, imperial. - Agent tools: `area_convert` (Converts an area between units using exact definitions (1 ha = 10 000 m², 1 are = 100 m², international foot 0.3048 m so 1 ft² = 0.09290304 m², 1 yd² = 9 ft², 1 acre = 43 560 ft² = 4046.8564224 m², 1 mi² = 640 acres; BIPM SI Brochure, NIST SP 811 B.8).) - Preset [Acres to hectares](https://how.box/en-us/conversion/acres-to-hectares/): How many hectares is an acre? The same tool, preconfigured. - [Aspect ratio calculator](https://how.box/en-us/media/aspect-ratio/): What is the aspect ratio of your screen or picture? Find the aspect ratio of a width and height, or resize a picture or video to a new width or height without stretching it. - 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/en-us/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/en-us/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.) - [Average calculator](https://how.box/en-us/math/average/): How do you find the average of these numbers? Mean, median, mode and range of a list of numbers, with the count, sum, smallest and largest. - 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/en-us/math/average/?v={v} (v: text), e.g. https://how.box/en-us/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/en-us/media/barcode/): How do I make a barcode? EAN-13, EAN-8, UPC-A, Code 128 and Finnish bank barcodes, ready to download. - 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/en-us/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/en-us/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 [Bank barcode generator](https://how.box/en-us/media/bank-barcode/): How do you make the bank barcode for an invoice? The same tool, preconfigured. - [Base64 encode and decode](https://how.box/en-us/text/base64/): How do you turn text or a file into Base64? Encode text or a file to Base64 and decode it back, right in your 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/en-us/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/en-us/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.) - [Battery sizes](https://how.box/en-us/electronics/battery-sizes/): How big is an AA battery, and what is it called elsewhere? Every common battery size, from AAA to D, 9 V, CR2032 and LR44 button cells to 18650: dimensions, voltage, IEC names and equivalents. - 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/en-us/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/en-us/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).) - [Blood sugar converter](https://how.box/en-us/health/blood-sugar/): How do you convert mmol/L to mg/dL? Convert blood glucose between mmol/L and mg/dL, and HbA1c between mmol/mol and %, with the estimated average glucose. - 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/en-us/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/en-us/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 calculator](https://how.box/en-us/health/bmi/): What is your body mass index (BMI)? Your BMI and its WHO adult category, the normal-weight range for your height, and what BMI cannot tell you. - 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/en-us/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/en-us/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.) - [Body fat calculator](https://how.box/en-us/health/body-fat/): How much of your body is fat? An estimate of your body fat percentage from a tape measure: height, neck and waist, plus the hip for women, by the US Navy method. - 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/en-us/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/en-us/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 translator](https://how.box/en-us/text/braille/): How do you write your text in braille? Turn text into Unified English Braille cells and back: letters, capitals, numbers and basic punctuation. - 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/en-us/text/braille/?d={d}&m={m} (d: encode or decode; m: text), e.g. https://how.box/en-us/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 calculator](https://how.box/en-us/finance/break-even/): How many do you need to sell to break even? See the units and sales that cover your fixed and variable costs. - 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/en-us/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/en-us/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).) - [Business ID checker](https://how.box/en-us/finance/business-id/): Is this business ID valid? Check a Finnish business ID's check digit and get the matching VAT number. - 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/en-us/finance/business-id/?id={id} (id: text), e.g. https://how.box/en-us/finance/business-id/?id=0112038-9. Served answer coverage: none (computed in the browser) - Runs entirely in the browser. Tags: checker, tax. Countries: FI (Finland). - 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.) - [Printable calendar](https://how.box/en-us/printables/calendar/): How do I print a calendar? A year or a month on one page, with week numbers and holidays, ready to print. - 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/en-us/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/en-us/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).) - [Daily calorie calculator](https://how.box/en-us/health/calories/): How many calories do you need a day? Your resting energy (BMR) and an estimate of the energy you use in a day, in kcal or kJ, from your age, size and activity. - 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/en-us/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/en-us/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.) - [Calories burned calculator](https://how.box/en-us/health/calories-burned/): How many calories does your workout burn? The energy you use in about 200 activities, from walking and running to swimming, skiing and housework, by their MET values. - 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/en-us/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/en-us/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.) - [Car loan calculator](https://how.box/en-us/finance/car-loan/): How much will your car loan cost? See the monthly payment and full purchase cost, including your deposit, trade-in, tax and fees. - 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/en-us/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/en-us/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.) - [Case converter](https://how.box/en-us/text/case/): How should your text be capitalized? Change letter case and copy any version. - 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/en-us/text/case/? (), e.g. https://how.box/en-us/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.) - [Chess clock](https://how.box/en-us/datetime/chess-clock/): How much time does each player have? Two chess clocks with increment or delay, a move counter and a flag at zero. - 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/en-us/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/en-us/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.) - [Chord finder](https://how.box/en-us/music/chords/): How do you play this chord? Pick a root and a chord type to see its notes and formula on a piano, hear it, or pick notes to find the chord's name. - 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/en-us/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/en-us/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).) - [Circle of fifths](https://how.box/en-us/music/circle-of-fifths/): How many sharps or flats does your key have? Pick a key on the circle of fifths to see its key signature, relative key, scale and chords, and hear them on a piano. - Addresses: en https://how.box/music/circle-of-fifths/, en-us https://how.box/en-us/music/circle-of-fifths/, fi https://how.box/fi/music/circle-of-fifths/, de https://how.box/de/music/circle-of-fifths/, es https://how.box/es/music/circle-of-fifths/, fr https://how.box/fr/music/circle-of-fifths/, sv https://how.box/sv/music/circle-of-fifths/, it https://how.box/it/music/circle-of-fifths/, et https://how.box/et/music/circle-of-fifths/ - Link to an answer: https://how.box/en-us/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/en-us/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 and Barcode Scanner](https://how.box/en-us/media/code-scan/): How do I scan a QR code or barcode? Scan with your camera or an image and see what a code holds, and where a link really leads, before you open it. - 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/en-us/media/code-scan/?f={f} (f: all, qr or linear), e.g. https://how.box/en-us/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/en-us/media/qr-scan/): How do I scan a QR code safely? The same tool, preconfigured. - Preset [Barcode Scanner](https://how.box/en-us/media/barcode-scan/): How do I read a barcode? The same tool, preconfigured. - [Color converter](https://how.box/en-us/web/color/): How do you write a color as HEX, RGB or HSL? Pick or type any color and copy it as HEX, RGB, HSL, HWB or OKLCH, with its nearest CSS name. - 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/en-us/web/color/?c={c} (c: text), e.g. https://how.box/en-us/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.) - [Combinations and permutations calculator](https://how.box/en-us/math/combinations/): How many ways can you pick them? Exact counts of combinations and permutations, with or without repetition, and the chance of one particular pick. - 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/en-us/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/en-us/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 [Lottery odds calculator](https://how.box/en-us/math/lottery-odds/): How likely is it to win the lottery? The same tool, preconfigured. - [Compound interest calculator](https://how.box/en-us/finance/compound-interest/): How much will your savings grow with compound interest? See your final balance, what you put in and the interest earned, year by year. - 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/en-us/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/en-us/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.) - [Concrete calculator](https://how.box/en-us/everyday/concrete/): How much concrete do I need? Cubic metres or yards of concrete and bags of pre-mix for a slab, a footing or post holes. - 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/en-us/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/en-us/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.) - [Confidence interval calculator](https://how.box/en-us/math/confidence-interval/): How precise is your sample's estimate? The confidence interval for a mean or a proportion from a sample, with the margin of error and the method used. - 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/en-us/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/en-us/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.) - [Color contrast checker](https://how.box/en-us/web/contrast/): How readable is this text on this background? Check the WCAG contrast of text on a background, see which levels it passes, and get a nearby color that does. - 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/en-us/web/contrast/?fg={fg}&bg={bg} (fg: text; bg: text), e.g. https://how.box/en-us/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.) - [Cooking converter](https://how.box/en-us/conversion/cooking/): How many grams are in a cup? Convert recipe amounts by ingredient. - 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/en-us/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/en-us/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 of sugar in grams](https://how.box/en-us/conversion/cup-of-sugar-in-grams/): How many grams is a cup of sugar? The same tool, preconfigured. - Preset [Cup of butter in grams](https://how.box/en-us/conversion/cup-of-butter-in-grams/): How many grams is a cup of butter? The same tool, preconfigured. - [Countdown](https://how.box/en-us/datetime/countdown/): How long until the big day? Days, hours, minutes and seconds to any date and time, or to the next New Year, Christmas or Midsummer, live and full screen. - 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/en-us/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/en-us/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 [Christmas countdown](https://how.box/en-us/datetime/christmas-countdown/): How many days until Christmas? The same tool, preconfigured. - Preset [Christmas Eve countdown](https://how.box/en-us/datetime/christmas-eve-countdown/): How many days until Christmas Eve? The same tool, preconfigured. - Preset [Midsummer countdown](https://how.box/en-us/datetime/midsummer-countdown/): How long until Midsummer Eve? The same tool, preconfigured. - [Country codes](https://how.box/en-us/everyday/country-codes/): What are a country’s ISO, phone and domain codes? ISO 3166 alpha-2, alpha-3 and numeric codes, calling codes and domains of 249 countries and territories. - 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/en-us/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/en-us/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 [International calling codes](https://how.box/en-us/everyday/calling-codes/): How do you dial a phone number in another country? The same tool, preconfigured. - Preset [Aircraft registration prefixes](https://how.box/en-us/everyday/aircraft-prefixes/): Which country is an aircraft registered in? The same tool, preconfigured. - [Credit card payoff calculator](https://how.box/en-us/finance/credit-card/): How long will it take to pay off your credit card? See the months to a zero balance and the interest you pay, at a fixed payment or the card's minimum. - 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/en-us/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/en-us/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).) - [Crosswind calculator](https://how.box/en-us/aviation/crosswind/): How much crosswind is on the runway? Crosswind and headwind or tailwind on any runway, with gusts, a runway diagram and your aircraft's crosswind limit. - 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/en-us/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/en-us/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 unit converter](https://how.box/en-us/conversion/css-units/): How many pixels is that in rem? Convert CSS lengths between px, rem, em, pt, pc, in, cm, mm and Q at your font size. - 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/en-us/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/en-us/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 to rem](https://how.box/en-us/conversion/px-to-rem/): How many rem is that many pixels? The same tool, preconfigured. - [Currency converter](https://how.box/en-us/finance/currency/): How much is it in another currency? Converts between about 30 currencies with the European Central Bank's daily reference rates, and shows the day they were set. - 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/en-us/finance/currency/?a={a}&f={f}&t={t} (a: number 0 to 1e12; f: text; t: text), e.g. https://how.box/en-us/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).) - [Currency codes](https://how.box/en-us/finance/currency-codes/): What is the currency code of the euro, the yen or the dollar? Every currency in use today with its ISO 4217 code, numeric code, symbol, decimals and the countries that use it, in your language. - 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/en-us/finance/currency-codes/?q={q}&d={d}&c={c} (q: text; d: (empty), 0, 2 or 3; c: text), e.g. https://how.box/en-us/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.) - [Dashboard warning lights](https://how.box/en-us/vehicles/dashboard-lights/): What does that warning light on your dashboard mean? Find a car warning light by its symbol or name: what it means, how urgent it is by colour, and what to do now. - 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/en-us/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/en-us/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.) - [Data size converter](https://how.box/en-us/conversion/data-size/): How much data is that in other units? Convert between bytes, kilobytes, megabytes, gigabytes, MiB, GiB and bits, with 1,000 and 1,024 kept apart. - 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/en-us/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/en-us/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 [Gigabytes to gibibytes](https://how.box/en-us/conversion/gb-to-gib/): How many gibibytes is a gigabyte? The same tool, preconfigured. - [Date difference](https://how.box/en-us/datetime/date-diff/): How many days are between your dates? Calendar days, full months and Finnish working days. - 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/en-us/datetime/date-diff/?f={f}&t={t}&i={i} (f: text; t: text; i: boolean), e.g. https://how.box/en-us/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).) - [Day-fine calculator](https://how.box/en-us/finance/day-fine/): How much is a day-fine in Finland? One day-fine and the total fine from your net income and dependants, by the Finnish Criminal Code. - 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/en-us/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/en-us/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 (Finland). - Agent tools: `day_fine_calculate` (Finland only: one day-fine (päiväsakko) and the total fine under Rikoslaki 2 a luku and decree 609/1999.) - [Day of the week](https://how.box/en-us/datetime/day-of-week/): What day of the week is it? The weekday of any date, and how many days ago or ahead it is. - 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/en-us/datetime/day-of-week/?d={d} (d: text), e.g. https://how.box/en-us/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.) - [Debt payoff calculator](https://how.box/en-us/finance/debt-payoff/): How fast can you pay off all your debts? See when you are debt-free and what the interest costs, paying the highest rate or the smallest debt first. - 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/en-us/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/en-us/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).) - [Decimal hours converter](https://how.box/en-us/datetime/decimal-hours/): How many decimal hours is 7 hours 30 minutes? Hours and minutes to decimal hours and back, and the total of a timesheet in both. - 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/en-us/datetime/decimal-hours/?t={t}&d={d} (t: text; d: whole number 0 to 4), e.g. https://how.box/en-us/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.) - [Density converter](https://how.box/en-us/conversion/density/): How dense is that in other units? Convert between kg/m³, g/cm³, kg/L, g/L, lb/ft³, lb/in³, oz/in³ and pounds per gallon. - Addresses: en https://how.box/conversion/density/, en-us https://how.box/en-us/conversion/density/, fi https://how.box/fi/conversion/density/, de https://how.box/de/conversion/density/, es https://how.box/es/conversion/density/, fr https://how.box/fr/conversion/density/, sv https://how.box/sv/conversion/density/, it https://how.box/it/conversion/density/, et https://how.box/et/conversion/density/ - Link to an answer: https://how.box/en-us/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/en-us/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).) - [Density altitude](https://how.box/en-us/aviation/density-altitude/): How high is the density altitude today? Pressure and density altitude of your airfield from elevation, QNH and temperature, with what the thin air means for take-off. - 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/en-us/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/en-us/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).) - [Descent planner](https://how.box/en-us/aviation/descent/): How far out should I start descending? Top of descent, vertical speed and time for a path angle or a descent rate, with the 3:1 rule beside the exact answer. - 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/en-us/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/en-us/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.) - [Dew point calculator](https://how.box/en-us/earth/dew-point/): At what temperature will your windows fog up? Find the dew point from temperature and humidity, or the humidity from the dew point. - 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/en-us/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/en-us/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.) - [Dice roller](https://how.box/en-us/everyday/dice/): Which number will the dice show? Roll one die or a handful, d20 or 3d6+2, with fair results you can see on the whole screen. - 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/en-us/everyday/dice/?n={n} (n: text), e.g. https://how.box/en-us/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).) - [Discount calculator](https://how.box/en-us/everyday/discount/): How much will you pay after the discount? See the sale price and how much you save. - 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/en-us/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/en-us/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 lookup](https://how.box/en-us/web/dns/): How is your domain set up in DNS? Look up addresses, mail servers and other DNS records. - 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/en-us/web/dns/?h={h}&t={t} (h: text; t: A, AAAA, CNAME, MX, TXT, NS, SOA or CAA), e.g. https://how.box/en-us/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.) - [Download time calculator](https://how.box/en-us/web/download-time/): How long will your download take? Enter the file size and your connection speed to see how long a download or upload takes. - 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/en-us/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/en-us/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)).) - [Drone flight time](https://how.box/en-us/aviation/drone-flight-time/): How long can my drone fly on one battery? Flight time from the battery’s mAh and voltage or Wh and the average draw, with a landing reserve and the energy 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/en-us/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/en-us/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).) - [Drone rules](https://how.box/en-us/aviation/drone-rules/): Which drone rules apply to my drone? The EU drone category for your drone's weight and class label, with registration, training, age and distances from people. - 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/en-us/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/en-us/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).) - [Drum machine](https://how.box/en-us/music/drum-machine/): How about making your own drum beat? Build a 16-step drum pattern with kick, snare, hi-hats, clap and tom, play it at your tempo and tap live pads on top. - 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/en-us/music/drum-machine/?t={t}&p={p} (t: whole number 40 to 240; p: text), e.g. https://how.box/en-us/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.) - [Daylight saving time changes](https://how.box/en-us/datetime/dst/): When do the clocks change next? The next and previous clock change in any time zone, whether the clocks go forward or back, and every change of a year. - 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/en-us/datetime/dst/?z={z}&y={y} (z: text; y: whole number 1970 to 2100), e.g. https://how.box/en-us/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.) - [Pregnancy due date calculator](https://how.box/en-us/health/due-date/): How far along is your pregnancy? Estimate your due date, pregnancy week and trimester from a period, conception or IVF transfer date. - 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/en-us/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/en-us/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.) - [Duration calculator](https://how.box/en-us/datetime/duration/): How much time is that? Find the time between two dates and clock times, add or subtract a duration, or total a list of hh:mm:ss times. - 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/en-us/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/en-us/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).) - [E-series preferred values](https://how.box/en-us/electronics/e-series/): Which standard resistor or capacitor value is closest? Find the nearest E3 to E192 value to the one you need, with its neighbours and error. - 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/en-us/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/en-us/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).) - [Electricity cost calculator](https://how.box/en-us/finance/electricity-cost/): How much does it cost to run an appliance? Turn an appliance's power, daily use and your electricity price into kWh and cost. - 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/en-us/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/en-us/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.) - [Employer cost calculator](https://how.box/en-us/finance/employer-cost/): How much does an employee cost the employer in Finland? What a monthly salary costs a Finnish employer with pension, unemployment and health insurance contributions. - 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/en-us/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/en-us/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 (Finland). - 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).) - [Energy converter](https://how.box/en-us/conversion/energy/): How much is that energy in other units? Convert between joules, kilowatt-hours, kilocalories, BTU and more, using exact definitions. - 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/en-us/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/en-us/conversion/energy/?v=1&from=kwh&to=mj. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser) - Runs entirely in the browser. Tags: converter, energy, metric. - Agent tools: `energy_convert` (Converts an energy between units using exact definitions (1 Wh = 3600 J, 1 kWh = 3.6 MJ, thermochemical calorie 4.184 J so 1 kcal = 4.184 kJ, International Table BTU 1055.05585262 J, 1 eV = 1.602176634e-19 J; BIPM SI Brochure, NIST SP 811 B.8).) - Preset [Kilocalories to kilojoules](https://how.box/en-us/conversion/kcal-to-kj/): How many kilojoules is a kilocalorie? The same tool, preconfigured. - [EV charging calculator](https://how.box/en-us/vehicles/ev-charging/): How long and how much does it cost to charge your electric car? Charging time, energy from the grid and cost for any charger, with losses and the car's own limits. - 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/en-us/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/en-us/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 [EV charging cost calculator](https://how.box/en-us/vehicles/ev-charging-cost/): How much will it cost to charge your electric car? The same tool, preconfigured. - Preset [EV charging time calculator](https://how.box/en-us/vehicles/ev-charging-time/): How long will your electric car take to charge? The same tool, preconfigured. - [EV range calculator](https://how.box/en-us/vehicles/ev-range/): How far will your electric car go? Estimate the range from battery size, consumption and charge level, with a cold-weather option. - 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/en-us/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/en-us/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 [EV winter range](https://how.box/en-us/vehicles/ev-winter-range/): How far will your electric car go in winter? The same tool, preconfigured. - [Flight delay compensation](https://how.box/en-us/aviation/flight-delay-compensation/): How much compensation are you owed for your delayed flight? Check EU 261 and UK 261: €250–600 or £220–520 for a late, cancelled or overbooked flight, with the reason. - 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/en-us/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/en-us/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.) - [Flight arrival time](https://how.box/en-us/everyday/flight-time/): What time will my flight land, in local time? The local landing time from the departure time and the hours in the air, across time zones, daylight saving time and the date line. - 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/en-us/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/en-us/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.) - [Force converter](https://how.box/en-us/conversion/force/): How much force is that in other units? Convert between newtons, kilonewtons, kilogram-force, pound-force, kips, dynes and poundals. - Addresses: en https://how.box/conversion/force/, en-us https://how.box/en-us/conversion/force/, fi https://how.box/fi/conversion/force/, de https://how.box/de/conversion/force/, es https://how.box/es/conversion/force/, fr https://how.box/fr/conversion/force/, sv https://how.box/sv/conversion/force/, it https://how.box/it/conversion/force/, et https://how.box/et/conversion/force/ - Link to an answer: https://how.box/en-us/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/en-us/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).) - [Fraction calculator](https://how.box/en-us/math/fraction/): How much is that in fractions? Add, subtract, multiply and divide fractions and mixed numbers, or turn a decimal into a fraction, with the answer in lowest terms. - 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/en-us/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/en-us/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.) - [Fuel cost calculator](https://how.box/en-us/everyday/fuel-cost/): How much will your trip cost in fuel? Work out the fuel and the cost of a trip from distance, consumption and fuel price. - 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/en-us/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/en-us/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.) - [Fuel economy converter](https://how.box/en-us/conversion/fuel-economy/): How thirsty is your car in other units? Convert between L/100 km, km/L, miles per gallon (US and imperial) and electric kWh/100 km, mi/kWh. - Addresses: en https://how.box/conversion/fuel-economy/, en-us https://how.box/en-us/conversion/fuel-economy/, fi https://how.box/fi/conversion/fuel-economy/, de https://how.box/de/conversion/fuel-economy/, es https://how.box/es/conversion/fuel-economy/, fr https://how.box/fr/conversion/fuel-economy/, sv https://how.box/sv/conversion/fuel-economy/, it https://how.box/it/conversion/fuel-economy/, et https://how.box/et/conversion/fuel-economy/ - Link to an answer: https://how.box/en-us/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/en-us/conversion/fuel-economy/?v=30&from=mpg_us&to=km_l. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser) - Runs entirely in the browser. Tags: converter, metric, imperial, energy. - Agent tools: `fuel_economy_calculate` (Converts fuel or electric consumption between units that count in opposite directions, using exact definitions (mile 1.609344 km, US gallon 3.785411784 L, imperial gallon 4.54609 L; NIST SP 811 B.8, UK Weights and Measures Act 1985).) - Preset [Miles per gallon to L/100 km](https://how.box/en-us/conversion/mpg-to-l-100km/): How many litres per 100 km is your mpg? The same tool, preconfigured. - Preset [Electric car consumption](https://how.box/en-us/conversion/ev-consumption/): How efficient is your electric car? The same tool, preconfigured. - [Full-screen clock](https://how.box/en-us/datetime/fullscreen-clock/): What time is it? An easy-to-read clock for your desk or the whole room. - 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/en-us/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/en-us/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 - [GCD and LCM calculator](https://how.box/en-us/math/gcd/): What do these numbers have in common? The greatest common divisor and the least common multiple of two to ten whole numbers, with the Euclidean steps. - 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/en-us/math/gcd/?n={n}&s={s} (n: text; s: gcd or lcm), e.g. https://how.box/en-us/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 [LCM calculator](https://how.box/en-us/math/lcm/): What is the least common multiple? The same tool, preconfigured. - [Gift tax calculator](https://how.box/en-us/finance/gift-tax/): How much gift tax is due on a gift in Finland? The Finnish gift tax on a gift, with the giver's earlier gifts from the last three years added in. - 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/en-us/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/en-us/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 (Finland). - 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 €).) - [Graph paper](https://how.box/en-us/printables/graph-paper/): How can I print graph paper at the right size? A square grid, sized for your paper. - 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/en-us/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/en-us/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/en-us/web/hash/): How do you get the hash of some text? SHA-256, SHA-512, SHA-1 and MD5 hashes of any text, made in your 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/en-us/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/en-us/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.) - [Heart rate zone calculator](https://how.box/en-us/health/heart-rate/): How fast should your heart beat when you train? Your estimated maximum heart rate and five training zones from your age and resting heart rate, by the Karvonen heart-rate reserve method. - 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/en-us/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/en-us/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.) - [Finnish public holidays](https://how.box/en-us/datetime/holidays/): When are the next public holidays in Finland? Finnish public holidays and eves for any year, with weekdays and the days to the next one. - 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/en-us/datetime/holidays/?y={y}&v={v} (y: whole number 1992 to 2100; v: all or flag_days), e.g. https://how.box/en-us/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 (Finland). - 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 [Finnish flag days](https://how.box/en-us/datetime/flag-days/): When are the flag days in Finland? The same tool, preconfigured. - [Home charger power](https://how.box/en-us/vehicles/home-charger/): How fast can you charge your car at home? Phases, amps and volts to charging power and the time to add the energy you need. - 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/en-us/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/en-us/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 charger](https://how.box/en-us/vehicles/11-kw-charger/): How long does an 11 kW charger take to charge your car? The same tool, preconfigured. - [HTTP status codes](https://how.box/en-us/web/http-status/): What does HTTP status 404 mean? Look up any HTTP status code: what 200, 301, 404, 429 or 503 means, when a server sends it, whether caches keep it and which RFC defines it. - 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/en-us/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/en-us/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 checker](https://how.box/en-us/finance/iban/): Is this IBAN valid? Check an IBAN's check digits and see it in print form, part by part. - 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/en-us/finance/iban/?iban={iban} (iban: text), e.g. https://how.box/en-us/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.) - [Image compress](https://how.box/en-us/media/image-compress/): How small can your image get? Make a photo's file smaller and see how much you saved. It stays on your device. - 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/en-us/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/en-us/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 [Compress image to 100 KB](https://how.box/en-us/media/compress-image-to-100kb/): How do you get a photo under 100 KB? The same tool, preconfigured. - [Image convert](https://how.box/en-us/media/image-convert/): How do you change an image's file type? Convert an image between PNG, JPEG, WebP and AVIF. It stays on your device. - 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/en-us/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/en-us/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.) - [Image resize](https://how.box/en-us/media/image-resize/): How big should your image be? Resize a photo or picture by width, height or percent. It stays on your device. - 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/en-us/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/en-us/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.) - [Inheritance tax calculator](https://how.box/en-us/finance/inheritance-tax/): How much inheritance tax will you pay in Finland? The Finnish inheritance tax on your share, by tax class, deductions and the scale for the date of death. - 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/en-us/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/en-us/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 (Finland). - 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 €).) - [Interval timer](https://how.box/en-us/datetime/interval-timer/): How long is your workout, round by round? Work and rest rounds with a big display and a sound at every change. - 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/en-us/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/en-us/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).) - [Is it down?](https://how.box/en-us/web/is-it-down/): How is this website responding? Check a website’s response from our server. - 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/en-us/web/is-it-down/?u={u} (u: text), e.g. https://how.box/en-us/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 formatter](https://how.box/en-us/web/json/): How can you format and check JSON? Paste JSON to find errors, tidy it up or make it compact. - Addresses: en https://how.box/web/json/, en-us https://how.box/en-us/web/json/, fi https://how.box/fi/web/json/, de https://how.box/de/web/json/, es https://how.box/es/web/json/, fr https://how.box/fr/web/json/, sv https://how.box/sv/web/json/, it https://how.box/it/web/json/, et https://how.box/et/web/json/ - Link to an answer: https://how.box/en-us/web/json/?mode={mode}&indent={indent}&sort={sort} (mode: pretty or minify; indent: 2, 4 or tab; sort: boolean), e.g. https://how.box/en-us/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.) - [Keyboard test](https://how.box/en-us/media/keyboard-test/): How well does your keyboard work? Press keys to see their codes and track which keys you have tested. - 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/en-us/media/keyboard-test/?layout={layout} (layout: ansi or iso), e.g. https://how.box/en-us/media/keyboard-test/?layout=iso. Served answer coverage: none (computed in the browser) - Runs entirely in the browser. Tags: checker. - Agent tools: none - [Late-payment interest calculator](https://how.box/en-us/finance/late-interest/): How much late-payment interest is owed in Finland? Statutory penalty interest on an overdue Finnish debt: the reference rate plus 7 points, half-year by half-year. - 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/en-us/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/en-us/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 (Finland). - 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.) - [Laundry symbols](https://how.box/en-us/everyday/laundry-symbols/): How do you read the symbols on a care label? Every care-label symbol decoded: wash tub, triangle, square, iron and circle, with temperatures, dots and bars explained in plain words. - 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/en-us/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/en-us/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.) - [Leave-by time calculator](https://how.box/en-us/everyday/leave-by/): When do I need to leave to get there on time? The latest time to set off: your arrival time minus the journey, the stops on the way and a safety margin, also across time zones. - 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/en-us/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/en-us/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 bulb savings calculator](https://how.box/en-us/everyday/led-savings/): How much will switching to LED bulbs save you? Compare an old bulb with an LED: the energy and money saved a year and how soon the LED pays for itself. - 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/en-us/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/en-us/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.) - [Length Converter](https://how.box/en-us/conversion/length/): How long is that in other units? Convert between metric and imperial lengths, exactly. - 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/en-us/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/en-us/conversion/length/?v=1&from=mi&to=km. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser) - Runs entirely in the browser. Tags: converter, length, distance, metric, imperial. - Agent tools: `length_convert` (Converts a length between units using exact definitions (1 in = 0.0254 m, 1 ft = 0.3048 m, 1 yd = 0.9144 m, 1 mi = 1609.344 m, 1 nmi = 1852 m).) - Preset [Miles to Kilometres](https://how.box/en-us/conversion/miles-to-km/): How many kilometres is a mile? The same tool, preconfigured. - Preset [Centimetres to Inches](https://how.box/en-us/conversion/cm-to-inches/): How many inches is a centimetre? The same tool, preconfigured. - Preset [Inches to Centimetres](https://how.box/en-us/conversion/inches-to-cm/): How many centimetres is an inch? The same tool, preconfigured. - Preset [Feet to Metres](https://how.box/en-us/conversion/feet-to-metres/): How many metres is a foot? The same tool, preconfigured. - [Loan calculator](https://how.box/en-us/finance/loan/): How much will your loan really cost? Payment, interest and fees of any loan: annuity or equal principal, monthly or less often. - 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/en-us/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/en-us/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.) - [Logic gates](https://how.box/en-us/electronics/logic-gates/): How do AND, OR, NOT and XOR gates work? Switch the inputs and see each logic gate's output at once, with its symbol in both standard styles, its Boolean expression and truth table. - 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/en-us/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/en-us/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.) - [Luggage size checker](https://how.box/en-us/everyday/luggage-size/): Does my bag fit the size limits? Check a bag's height, width, depth and weight against any size limit, with the total L + W + H, a box drawing and centimetres or inches. - 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/en-us/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/en-us/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 [Cabin baggage size by airline](https://how.box/en-us/everyday/cabin-baggage/): Will my bag fit in the cabin? The same tool, preconfigured. - [Macro calculator](https://how.box/en-us/health/macros/): How many grams of protein, fat and carbs is that? Turn a daily calorie target and a split in percent into grams of protein, fat and carbohydrate, a day and per meal. - 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/en-us/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/en-us/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.) - [Margin calculator](https://how.box/en-us/finance/margin/): How much margin do you make on a sale? See the profit margin, markup and profit from cost and selling price. - 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/en-us/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/en-us/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 [Markup calculator](https://how.box/en-us/finance/markup/): How big is your markup? The same tool, preconfigured. - [Math drills](https://how.box/en-us/kids/math-drills/): How well do you know your arithmetic? Practise at your own pace, or print a sheet to solve on paper. - 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/en-us/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/en-us/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.) - [Meeting planner](https://how.box/en-us/datetime/meeting-planner/): How do you find a meeting time that works in every time zone? Pick two to six places and a day to see an hour grid, working hours and the best time for everyone. - 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/en-us/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/en-us/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 and TAF decoder](https://how.box/en-us/aviation/metar/): How do you read a METAR or TAF? Paste an aviation weather report and read every group in plain words, with the flight category, humidity and density altitude. - 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/en-us/aviation/metar/?r={r} (r: text), e.g. https://how.box/en-us/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.) - [Metronome: steady beats for music practice](https://how.box/en-us/music/metronome/): How will you keep a steady beat? Set the tempo, hear the beat and follow the pendulum. - 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/en-us/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/en-us/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.) - [Microphone test](https://how.box/en-us/media/mic-test/): Is my microphone working? Press Start and speak: the level meter shows what your microphone picks up. - 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/en-us/media/mic-test/?p={p} (p: raw or voice), e.g. https://how.box/en-us/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.) - [Mileage allowance calculator](https://how.box/en-us/finance/mileage/): How much tax-free mileage allowance can you get in Finland? The Finnish tax-free kilometre allowance and per diem for a work trip, at the Tax Administration's rates. - 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/en-us/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/en-us/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 (Finland). - 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 address lookup](https://how.box/en-us/aviation/mode-s/): Which country is an aircraft's transponder address from? Type an aircraft's 24-bit Mode S or ADS-B address in hex, octal or binary to see the country block it belongs to. - 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/en-us/aviation/mode-s/?a={a}&b={b} (a: text; b: hex, octal or binary), e.g. https://how.box/en-us/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.) - [Moon phase](https://how.box/en-us/datetime/moon-phase/): What phase is the moon in? The Moon's phase right now or on any date, with how much of it is lit and the next new and full moon. - 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/en-us/datetime/moon-phase/?d={d}&lat={lat}&lon={lon}&z={z} (d: text; lat: text; lon: text; z: text), e.g. https://how.box/en-us/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.) - [Morse code translator](https://how.box/en-us/text/morse/): How do you write, play and hear Morse code? Turn text into Morse code and back, play it as sound or light, decode it from the microphone or camera, or key it by 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/en-us/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/en-us/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.) - [Morse trainer](https://how.box/en-us/text/morse-trainer/): How do you learn to copy Morse code by ear? Learn Morse code the Koch way: hear random groups at full speed, type them, and add a character at 90 % accuracy. - 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/en-us/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/en-us/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).) - [Mortgage calculator](https://how.box/en-us/finance/mortgage/): How much will your home loan really cost each month? See your monthly payment, total interest and how your loan shrinks over time. - 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/en-us/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/en-us/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.) - [Browser info](https://how.box/en-us/web/my-browser/): How does your browser identify itself? Browser, engine and device facts, reported here. - 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/en-us/web/my-browser/?facet={facet} (facet: identity, update, agent, display, chrome or tesla), e.g. https://how.box/en-us/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 update check](https://how.box/en-us/web/is-my-browser-up-to-date/): Is my browser up to date? The same tool, preconfigured. - Preset [Browser identification](https://how.box/en-us/web/what-browser-am-i-using/): What browser am I using? The same tool, preconfigured. - Preset [My user agent](https://how.box/en-us/web/my-user-agent/): What is my user-agent string? The same tool, preconfigured. - Preset [My screen resolution](https://how.box/en-us/web/my-screen-resolution/): What is my screen resolution? The same tool, preconfigured. - Preset [Chrome version](https://how.box/en-us/web/chrome-version/): What Chrome version do I have? The same tool, preconfigured. - Preset [Tesla browser](https://how.box/en-us/web/tesla-browser/): Which Chrome version is my Tesla’s browser running? The same tool, preconfigured. - [Net salary calculator](https://how.box/en-us/finance/net-salary/): How much of your salary do you take home? Gross to net pay in Germany, Estonia or Finland, with every tax and contribution. - 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/en-us/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/en-us/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 (Germany), EE (Estonia), FI (Finland). - 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 calculator](https://how.box/en-us/finance/brutto-netto-rechner/): How much is left of your German gross salary? The same tool, preconfigured. - Preset [Estonian salary calculator](https://how.box/en-us/finance/palgakalkulaator/): How much net pay does an Estonian gross salary give? The same tool, preconfigured. - Preset [Finnish net salary calculator](https://how.box/en-us/finance/nettopalkka/): How much net pay does a Finnish gross salary give? The same tool, preconfigured. - [Note frequency](https://how.box/en-us/music/note-frequency/): What frequency is a musical note? Convert a note to hertz or a frequency to its nearest note, with cents, MIDI number, an octave table and the sound of it. - 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/en-us/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/en-us/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 [Note names](https://how.box/en-us/music/note-names/): What are the notes called in other languages? The same tool, preconfigured. - [NPV and IRR calculator](https://how.box/en-us/finance/npv/): How much is an investment worth today? Discount a list of yearly cash flows to today's money and find the rate at which the investment breaks even. - 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/en-us/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/en-us/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).) - [Number base converter](https://how.box/en-us/math/number-base/): How do you convert a number between bases? Convert whole numbers between binary, octal, decimal, hexadecimal and any base up to 36. - Addresses: en https://how.box/math/number-base/, en-us https://how.box/en-us/math/number-base/, fi https://how.box/fi/math/number-base/, de https://how.box/de/math/number-base/, es https://how.box/es/math/number-base/, fr https://how.box/fr/math/number-base/, sv https://how.box/sv/math/number-base/, it https://how.box/it/math/number-base/, et https://how.box/et/math/number-base/ - Link to an answer: https://how.box/en-us/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/en-us/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 to decimal converter](https://how.box/en-us/math/hex-to-decimal/): What is a hexadecimal number in decimal? The same tool, preconfigured. - [Ohm's law calculator](https://how.box/en-us/physics/ohms-law/): How much current flows, and how much power is used? Give any two of voltage, current, resistance and power to get the other two. - 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/en-us/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/en-us/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.) - [Old currency converter](https://how.box/en-us/finance/old-currency/): How much is old money in euros today? Markka, Deutsche Mark, franc, lira and every other former euro currency at its fixed euro rate, and the markka also in today's money. - 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/en-us/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/en-us/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 converter](https://how.box/en-us/finance/mummonmarkka/): How much is that in markka? The same tool, preconfigured. - Preset [Inflation calculator for Finland](https://how.box/en-us/finance/inflation/): How much is €100 from 2005 today? The same tool, preconfigured. - [One-rep max calculator](https://how.box/en-us/health/one-rep-max/): How much could you lift for one rep? Your estimated one-rep max from a set you have done, with the weights for 1 to 12 reps, by the Epley or Brzycki formula. - 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/en-us/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/en-us/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.) - [Running pace calculator](https://how.box/en-us/health/pace/): How fast do you need to run? Turn a finish time into a pace and speed, or a pace into a finish time, with splits for every kilometre or mile. - Addresses: en https://how.box/health/pace/, en-us https://how.box/en-us/health/pace/, fi https://how.box/fi/health/pace/, de https://how.box/de/health/pace/, es https://how.box/es/health/pace/, fr https://how.box/fr/health/pace/, sv https://how.box/sv/health/pace/, it https://how.box/it/health/pace/, et https://how.box/et/health/pace/ - Link to an answer: https://how.box/en-us/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/en-us/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 calculator](https://how.box/en-us/health/marathon-pace/): What pace do you need for your marathon goal? The same tool, preconfigured. - Preset [Half marathon pace calculator](https://how.box/en-us/health/half-marathon-pace/): What pace do you need for your half marathon goal? The same tool, preconfigured. - [Paint calculator](https://how.box/en-us/everyday/paint/): How much paint do I need for a room? Litres or gallons of paint and whole cans to buy, from the room's size, the coats and the coverage on the tin. - 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/en-us/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/en-us/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.) - [Paper sizes](https://how.box/en-us/conversion/paper-size/): How big is that paper size? Look up A, B and C series sizes and US Letter, Legal and Tabloid in millimetres, centimetres, inches or points. - Addresses: en https://how.box/conversion/paper-size/, en-us https://how.box/en-us/conversion/paper-size/, fi https://how.box/fi/conversion/paper-size/, de https://how.box/de/conversion/paper-size/, es https://how.box/es/conversion/paper-size/, fr https://how.box/fr/conversion/paper-size/, sv https://how.box/sv/conversion/paper-size/, it https://how.box/it/conversion/paper-size/, et https://how.box/et/conversion/paper-size/ - Link to an answer: https://how.box/en-us/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/en-us/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.) - [Passport photo](https://how.box/en-us/media/passport-photo/): How do you make a passport photo the right size? Crop your own photo to the official passport size, with head guides, and save it as a file or a print sheet. It never leaves your device. - 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/en-us/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/en-us/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.) - [Password generator](https://how.box/en-us/web/password/): How strong should your new password be? A random password made on your device, with its strength in bits and nothing sent anywhere. - 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/en-us/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/en-us/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.) - [Percentage calculator](https://how.box/en-us/math/percentage/): How much is that in per cent? Percent of a number, what percent one number is of another, percentage change and difference, and the number before a discount. - 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/en-us/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/en-us/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 [Percentage change calculator](https://how.box/en-us/math/percentage-change/): How much did it go up or down in per cent? The same tool, preconfigured. - [Pet age calculator](https://how.box/en-us/everyday/pet-age/): How old is your pet in human years? Your dog's or cat's age in human years from today's science, not the old ×7 rule, plus its life stage. - 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/en-us/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/en-us/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 [Dog age calculator](https://how.box/en-us/everyday/dog-age/): How old is your dog in human years? The same tool, preconfigured. - Preset [Cat age calculator](https://how.box/en-us/everyday/cat-age/): How old is your cat in human years? The same tool, preconfigured. - [Piano](https://how.box/en-us/music/piano/): How about playing the piano right here? Play a two-octave piano with the mouse, touch, your computer keyboard or a MIDI keyboard, with sustain and note names. - 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/en-us/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/en-us/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).) - [Random name picker](https://how.box/en-us/everyday/picker/): Who will be picked? Spin the wheel to pick winners from your list, or split everyone into fair teams. - 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/en-us/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/en-us/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/en-us/datetime/pomodoro/): How long should you focus before a break? Focus sessions and breaks on repeat, with a sound at the end of each. - 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/en-us/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/en-us/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.) - [Power converter](https://how.box/en-us/conversion/power/): How much is that power in other units? Convert between watts, kilowatts, megawatts, horsepower, metric horsepower and BTU per hour, exactly. - 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/en-us/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/en-us/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 [Horsepower to kilowatts](https://how.box/en-us/conversion/hp-to-kw/): How many kilowatts is a horsepower? The same tool, preconfigured. - [Screen PPI calculator](https://how.box/en-us/media/ppi/): How sharp is your screen? Enter the resolution and screen size to get pixels per inch, dot pitch and the physical size of the display. - 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/en-us/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/en-us/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.) - [Present value calculator](https://how.box/en-us/finance/present-value/): How much is future money worth today? Discount a future amount back to today's money at the rate you choose. - 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/en-us/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/en-us/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.) - [Pressure converter](https://how.box/en-us/conversion/pressure/): How much pressure is that in other units? Convert between pascals, hectopascals, kilopascals, bar, psi, atmospheres, mmHg and inHg. - Addresses: en https://how.box/conversion/pressure/, en-us https://how.box/en-us/conversion/pressure/, fi https://how.box/fi/conversion/pressure/, de https://how.box/de/conversion/pressure/, es https://how.box/es/conversion/pressure/, fr https://how.box/fr/conversion/pressure/, sv https://how.box/sv/conversion/pressure/, it https://how.box/it/conversion/pressure/, et https://how.box/et/conversion/pressure/ - Link to an answer: https://how.box/en-us/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/en-us/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).) - [Prime number checker](https://how.box/en-us/math/prime/): Is your number a prime number? Test any whole number up to 100 digits for primality, with its prime factors and the next and previous prime. - 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/en-us/math/prime/?n={n} (n: text), e.g. https://how.box/en-us/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?) - [Prize wheel](https://how.box/en-us/everyday/prize-wheel/): What will you win? List your prizes, spin the wheel and give them out one by one: a fair draw for raffles, parties and events. - 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/en-us/everyday/prize-wheel/?p={p}&c={c}&r={r} (p: text; c: whole number 5 to 100; r: boolean), e.g. https://how.box/en-us/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.) - [Blood alcohol calculator](https://how.box/en-us/health/promille/): How much alcohol is in your blood? A rough estimate of your blood alcohol in per mille (‰) and how long your body takes to clear it, by the Widmark formula. - 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/en-us/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/en-us/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/en-us/media/qr-code/): How do I make a QR code? Static codes made on your device: no expiry, no redirects, no 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/en-us/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/en-us/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 [Wi-Fi QR code](https://how.box/en-us/media/wifi-qr/): How do I make a QR code for my Wi-Fi? The same tool, preconfigured. - Preset [Contact QR code (vCard)](https://how.box/en-us/media/vcard-qr/): How do I put my contact details in a QR code? The same tool, preconfigured. - Preset [Email QR code](https://how.box/en-us/media/email-qr/): How do I make a QR code that starts an email? The same tool, preconfigured. - Preset [SMS QR code](https://how.box/en-us/media/sms-qr/): How do I make a QR code that sends a text message? The same tool, preconfigured. - Preset [Event QR code](https://how.box/en-us/media/event-qr/): How do I make a QR code for a calendar event? The same tool, preconfigured. - Preset [Location QR code](https://how.box/en-us/media/geo-qr/): How do I make a QR code for a location? The same tool, preconfigured. - Preset [Payment QR code (EPC QR)](https://how.box/en-us/media/payment-qr/): How do I make a QR code for a bank transfer? The same tool, preconfigured. - [Random number](https://how.box/en-us/everyday/random-number/): Which number will chance pick? Fair random numbers from your device's secure generator, with or without repeats. - 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/en-us/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/en-us/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 [Coin flip](https://how.box/en-us/everyday/coin-flip/): Heads or tails? The same tool, preconfigured. - [Ratio calculator](https://how.box/en-us/math/ratio/): How do you simplify a ratio or find the missing number? Simplify a ratio to its lowest terms, or find the missing number in an equal ratio, the rule of three. - 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/en-us/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/en-us/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).) - [Reference number generator](https://how.box/en-us/finance/reference-number/): How do you make a valid reference number? Create a Finnish reference number with its check digit, or check one, with the 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/en-us/finance/reference-number/?m={m}&r={r}&b={b} (m: check or create; r: text; b: text), e.g. https://how.box/en-us/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 (Finland). - 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.) - [Refinance calculator](https://how.box/en-us/finance/refinance/): How much could refinancing save you? Compare a new payment with closing costs and the interest left on your current loan. - 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/en-us/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/en-us/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.) - [Rent vs buy calculator](https://how.box/en-us/finance/rent-vs-buy/): Is it better to rent or buy your home? Compare renting and buying over the years you plan to stay, with every assumption in view. - 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/en-us/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/en-us/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).) - [Resistor colour code calculator](https://how.box/en-us/physics/resistor/): How do you read a resistor's colour bands? Turn 4, 5 or 6 colour bands into ohms and tolerance, or find the bands of a value. - 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/en-us/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/en-us/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 calculator](https://how.box/en-us/finance/roi/): How much did your investment return? See the total return, the gain and the yearly rate it equals. - 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/en-us/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/en-us/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 calculator](https://how.box/en-us/finance/cagr/): How fast did it grow each year? The same tool, preconfigured. - [Roman numeral converter](https://how.box/en-us/conversion/roman/): How do you write that in Roman numerals? Turn a number into Roman numerals, or Roman numerals into a number, in the standard form from 1 to 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/en-us/conversion/roman/?v={v} (v: text), e.g. https://how.box/en-us/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).) - [Salary converter](https://how.box/en-us/finance/salary/): How much is your pay in another period? Compare gross pay using your own working schedule. - 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/en-us/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/en-us/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.) - [Sample size calculator](https://how.box/en-us/math/sample-size/): How many responses does your survey need? The number of survey responses you need for a margin of error and confidence level, for any population size. - 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/en-us/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/en-us/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.) - [Savings goal calculator](https://how.box/en-us/finance/savings-goal/): How much do you need to save to reach your goal? See the monthly or yearly deposit that grows your savings to the goal on time. - 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/en-us/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/en-us/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.) - [Scientific calculator](https://how.box/en-us/math/scientific/): How much does it equal? Type a calculation or use the keys. - 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/en-us/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/en-us/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.) - [Scientific notation converter](https://how.box/en-us/math/scientific-notation/): How do you write this number in scientific notation? Write a number in scientific and engineering notation with the significant figures you choose, or turn 6.022e23 back into digits. - 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/en-us/math/scientific-notation/?n={n}&s={s} (n: text; s: whole number 1 to 20), e.g. https://how.box/en-us/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.) - [Flag semaphore alphabet](https://how.box/en-us/text/semaphore/): How do you write your name in flag semaphore? Turn text into flag semaphore figures, or read a letter from the positions of the two arms. - 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/en-us/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/en-us/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.) - [Series and parallel calculator](https://how.box/en-us/physics/series-parallel/): How do resistors and capacitors add up? Combine 2 to 12 resistors or capacitors and see the equivalent value. - 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/en-us/physics/series-parallel/?k={k}&a={a}&p={p} (k: resistor or capacitor; a: series or parallel; p: array), e.g. https://how.box/en-us/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.) - [Area of shapes](https://how.box/en-us/math/shape-area/): How big is the area of this shape? Area and perimeter of rectangles, circles, triangles and eight more shapes, drawn to scale. - 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/en-us/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/en-us/math/shape-area/?s=rectangle&a=4&b=3&c=2&n=6&t=1.5707963267948966&u=m&au=deg. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser) - Runs entirely in the browser. Tags: calculator, geometry, area, metric, imperial. - Agent tools: `shape_area_calculate` (Area and perimeter of a plane shape (CRC Standard Mathematical Tables §4.5–4.6; triangle by Heron, ellipse perimeter by Ramanujan's approximation).) - [Volume of solids](https://how.box/en-us/math/shape-volume/): How much does this shape hold? Volume and surface area of boxes, cylinders, spheres, cones and seven more solids, in litres and gallons too. - 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/en-us/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/en-us/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 [Pool volume](https://how.box/en-us/math/pool/): How much water does the pool hold? The same tool, preconfigured. - [Shoe size converter](https://how.box/en-us/conversion/shoe-size/): How does your shoe size convert? Compare reference sizes for adults and children. - 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/en-us/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/en-us/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.) - [Sleep cycle calculator](https://how.box/en-us/health/sleep/): How can you plan your sleep? Find bedtimes or wake times using an approximate 90-minute cycle. - 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/en-us/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/en-us/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).) - [Speed converter](https://how.box/en-us/conversion/speed/): How fast is that in other units? Convert between kilometres per hour, miles per hour, metres per second, knots and feet per minute. - Addresses: en https://how.box/conversion/speed/, en-us https://how.box/en-us/conversion/speed/, fi https://how.box/fi/conversion/speed/, de https://how.box/de/conversion/speed/, es https://how.box/es/conversion/speed/, fr https://how.box/fr/conversion/speed/, sv https://how.box/sv/conversion/speed/, it https://how.box/it/conversion/speed/, et https://how.box/et/conversion/speed/ - Link to an answer: https://how.box/en-us/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/en-us/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 to mph](https://how.box/en-us/conversion/kmh-to-mph/): How many miles per hour is 100 km/h? The same tool, preconfigured. - [Split bill](https://how.box/en-us/everyday/split-bill/): How much should each person pay? Divide one bill by uneven shares, down to the last cent, with shares that always add up. - 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/en-us/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/en-us/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/en-us/aviation/squawk/): What does squawk 7700 mean? Look up any transponder code: the emergency codes 7500, 7600 and 7700, and the VFR and IFR codes country by country, with the rule that sets each one. - 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/en-us/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/en-us/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 Certificate Checker](https://how.box/en-us/web/ssl/): Is your SSL certificate valid and trusted? Expiry, issuer, covered names, chain and TLS version of any public site, with plain-language fixes. - 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/en-us/web/ssl/?h={h}&p={p} (h: text; p: 443, 465, 636, 853, 993, 995 or 8443), e.g. https://how.box/en-us/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).) - [Standard atmosphere (ISA)](https://how.box/en-us/aviation/standard-atmosphere/): How do temperature, pressure and density change with altitude? The ICAO standard atmosphere at any altitude or flight level, on a standard day or a warmer or colder one. - 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/en-us/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/en-us/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).) - [Standard deviation calculator](https://how.box/en-us/math/standard-deviation/): How spread out are these numbers? Sample or population standard deviation and variance of a list of numbers, with the mean and the standard error. - 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/en-us/math/standard-deviation/?v={v}&k={k} (v: text; k: sample or population), e.g. https://how.box/en-us/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.) - [Stopwatch](https://how.box/en-us/datetime/stopwatch/): How long did it take? Start, lap, stop: every split kept. - 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/en-us/datetime/stopwatch/?f={f} (f: segments), e.g. https://how.box/en-us/datetime/stopwatch/?f=segments. Served answer coverage: none (computed in the browser) - Runs entirely in the browser. Tags: calculator, fitness. - Agent tools: none - [Student loan repayment calculator](https://how.box/en-us/finance/student-loan/): How much will you repay on your student loan? See the monthly payment and total interest, with the Finnish Kela compensation and interest subsidy when they apply. - 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/en-us/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/en-us/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.) - [Sunrise and sunset](https://how.box/en-us/datetime/sunrise/): When does the sun rise and set? Sunrise, sunset, solar noon, day length and twilight for any place and date, from its coordinates. - 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/en-us/datetime/sunrise/?lat={lat}&lon={lon}&d={d}&z={z} (lat: text; lon: text; d: text; z: text), e.g. https://how.box/en-us/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).) - [Synth](https://how.box/en-us/music/synth/): How would your tune sound on a synth? Play and shape a keyboard synth: choose the waveform, envelope, filter and LFO, then play with the mouse, touch, your computer keyboard or a 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/en-us/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} (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/en-us/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<=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).) - [Tailpipe CO₂ calculator](https://how.box/en-us/vehicles/tailpipe-co2/): How much CO₂ does your car emit? Grams of CO₂ per kilometre or mile, and kilograms a year, from what your petrol or diesel car burns. - 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/en-us/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/en-us/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.) - [Temperature Converter](https://how.box/en-us/conversion/temperature/): How warm or cold is that on other scales? Celsius, Fahrenheit, kelvin, Rankine and oven gas marks, exactly. - 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/en-us/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/en-us/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 to Fahrenheit](https://how.box/en-us/conversion/celsius-to-fahrenheit/): How do you convert Celsius to Fahrenheit? The same tool, preconfigured. - Preset [Fahrenheit to Celsius](https://how.box/en-us/conversion/fahrenheit-to-celsius/): How do you convert Fahrenheit to Celsius? The same tool, preconfigured. - [Text diff](https://how.box/en-us/text/text-diff/): How do these texts differ? See additions and removals, line by line or word by word. - 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/en-us/text/text-diff/?mode={mode}&case={case}&space={space} (mode: lines or words; case: boolean; space: boolean), e.g. https://how.box/en-us/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.) - [Tile calculator](https://how.box/en-us/everyday/tiles/): How many tiles do I need? Tiles and boxes, flooring packs or wallpaper rolls for a floor or wall, with extra for cuts and waste. - 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/en-us/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/en-us/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 [Flooring calculator](https://how.box/en-us/everyday/flooring/): How much flooring do I need? The same tool, preconfigured. - Preset [Wallpaper calculator](https://how.box/en-us/everyday/wallpaper/): How many rolls of wallpaper do I need? The same tool, preconfigured. - [Countdown timer](https://how.box/en-us/datetime/timer/): How much time is left? A little time, clearly counted. - 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/en-us/datetime/timer/?d={d}&f={f} (d: whole number 1000 to 3.59999e8; f: segments), e.g. https://how.box/en-us/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 [Egg timer](https://how.box/en-us/datetime/egg-timer/): How long should you boil an egg? The same tool, preconfigured. - [Times table practice](https://how.box/en-us/kids/times-tables/): How well do you know your times tables? Pick your tables. Take your time, try again, and see how many you know. - 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/en-us/kids/times-tables/?n={n} (n: text), e.g. https://how.box/en-us/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 - [Time zone converter](https://how.box/en-us/datetime/timezone/): What time is it there when it's this time here? One time converted to several time zones at once, with the date, the offset and daylight saving time on that day. - 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/en-us/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/en-us/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 [Time difference](https://how.box/en-us/datetime/time-difference/): How many hours apart are two places? The same tool, preconfigured. - Preset [Time zone list](https://how.box/en-us/datetime/tz-list/): What is the UTC offset of every time zone? The same tool, preconfigured. - [Tip calculator](https://how.box/en-us/everyday/tip/): How much is the tip, and what does everyone pay? Add a tip to the bill and split the total between people, exact to the cent. - 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/en-us/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/en-us/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.) - [Tipping by country](https://how.box/en-us/everyday/tipping/): How much should you tip in another country? Restaurant, taxi and hotel tipping customs by country, from official tourism pages, with the tip and total for your bill. - 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/en-us/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/en-us/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.) - [Tone Generator](https://how.box/en-us/physics/tone/): How does this frequency sound? Play a test tone from 1 Hz to 20 kHz and see its note, period and wavelength. - 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/en-us/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/en-us/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.) - [Torque converter](https://how.box/en-us/conversion/torque/): How much torque is that in other units? Convert between newton metres, foot-pounds, inch-pounds, kilogram-force metres and more. - 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/en-us/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/en-us/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 [Newton metres to foot-pounds](https://how.box/en-us/conversion/nm-to-ft-lb/): How many foot-pounds is a newton metre? The same tool, preconfigured. - [Toy piano](https://how.box/en-us/kids/toy-piano/): How about playing a song on the toy piano? Big colourful keys with toy piano, xylophone and marimba sounds, and songs where the next key lights up. - 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/en-us/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/en-us/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.) - [Transfer tax calculator](https://how.box/en-us/finance/transfer-tax/): How much transfer tax do you pay on a home in Finland? The Finnish transfer tax on a flat, a property or shares, at the rates for your contract date. - 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/en-us/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/en-us/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 (Finland). - Agent tools: `transfer_tax_calculate` (Finland only: the transfer tax (varainsiirtovero) one buyer pays, by Varainsiirtoverolaki 931/1996 and the contract date.) - [Triangle solver](https://how.box/en-us/math/triangle/): How do I solve a triangle? Give three parts of a triangle and get the other three, its area and a drawing to scale, including the case with two answers. - 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/en-us/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/en-us/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).) - [Tuner](https://how.box/en-us/music/tuner/): Is your instrument in tune? Play one note near your microphone to see the nearest note, cents sharp or flat and the frequency. Sound stays on your device. - 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/en-us/music/tuner/?i={i}&a={a} (i: chromatic, guitar, bass, ukulele or violin; a: number 400 to 480), e.g. https://how.box/en-us/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).) - [Typing test](https://how.box/en-us/text/typing-test/): How fast can you type? Your typing speed in words per minute, with your accuracy and the keys you miss most. - 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/en-us/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/en-us/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.) - [Unit price comparison](https://how.box/en-us/finance/unit-price/): How do you find the cheapest pack per kilo or litre? Compare packs of different sizes by price per kilogram, litre or piece. - 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/en-us/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/en-us/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 timestamp converter](https://how.box/en-us/datetime/unix-time/): How do you turn a Unix timestamp into a date? Convert Unix timestamps to dates and dates to timestamps, in any time zone. - 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/en-us/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/en-us/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 encode and decode](https://how.box/en-us/web/url-encode/): How do you encode text for a web address? Percent-encode text for a web address, or decode %20 and friends back to plain text. - 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/en-us/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/en-us/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/en-us/web/uuid/): How do you make a new UUID? Random UUIDs, version 4 or time-ordered version 7, made on your device. - 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/en-us/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/en-us/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).) - [VAT calculator](https://how.box/en-us/finance/vat/): How much VAT is in a price? Add VAT to a price or take it out, with the standard and reduced VAT rates of your country. - 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/en-us/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/en-us/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 [UK VAT calculator](https://how.box/en-us/finance/uk-vat/): How much VAT is in a UK price? The same tool, preconfigured. - Preset [Austria VAT calculator](https://how.box/en-us/finance/austria-vat/): How much VAT is in an Austrian price? The same tool, preconfigured. - Preset [Swiss VAT calculator](https://how.box/en-us/finance/swiss-vat/): How much VAT is in a Swiss price? The same tool, preconfigured. - [Volume converter](https://how.box/en-us/conversion/volume/): How much is that in other volume units? Convert between millilitres, litres, cubic metres, US gallons and imperial gallons, exactly. - 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/en-us/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/en-us/conversion/volume/?v=1&from=l&to=us_gal. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser) - Runs entirely in the browser. Tags: converter, volume, metric, imperial. - Agent tools: `volume_convert` (Converts a volume between units using exact definitions (1 L = 0.001 m³, 1 mL = 0.001 L, US liquid gallon = 231 in³ = 3.785411784 L, imperial gallon = 4.54609 L; US quart, pint and fluid ounce = 1/4, 1/8 and 1/128 US gallon; imperial pint and fluid ounce = 1/8 and 1/160 imperial gallon; cubic mm, cm, inch, foot and yard as the cubes of their lengths; NIST SP 811 B.8, UK Weights and Measures Act 1985 Sch.) - Preset [Litres to US gallons](https://how.box/en-us/conversion/litres-to-gallons/): How many US gallons is a litre? The same tool, preconfigured. - [Waist-to-height ratio calculator](https://how.box/en-us/health/waist-height/): Is your waist less than half your height? Your waist-to-height ratio and what it says about fat around the middle, with the NICE bands and the half-your-height rule. - 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/en-us/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/en-us/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/en-us/media/webcam-test/): Is my webcam working? Press Start to see your camera live, with its picture size and frame rate. - 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/en-us/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/en-us/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.) - [Week number](https://how.box/en-us/datetime/week-number/): What week number is it? Today's ISO week number, the week of any date, and the dates of any week. - 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/en-us/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/en-us/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.) - [Weight converter](https://how.box/en-us/conversion/weight/): How much does that weigh in other units? Convert between kilograms, grams, pounds, ounces, stone, tons, carats and more, exactly. - 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/en-us/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/en-us/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 [Kilograms to pounds](https://how.box/en-us/conversion/kg-to-lb/): How many pounds is a kilogram? The same tool, preconfigured. - Preset [Pounds to kilograms](https://how.box/en-us/conversion/lb-to-kg/): How many kilograms is a pound? The same tool, preconfigured. - [What is my IP?](https://how.box/en-us/web/what-is-my-ip/): How does the internet see your connection? Your public IP and the network behind it. - 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/en-us/web/what-is-my-ip/?view={view} (view: ip, ipv6, isp or location), e.g. https://how.box/en-us/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 [Do I have IPv6?](https://how.box/en-us/web/do-i-have-ipv6/): Does this connection use IPv6? The same tool, preconfigured. - Preset [My ISP](https://how.box/en-us/web/my-isp/): Which network carries your connection? The same tool, preconfigured. - Preset [IP location](https://how.box/en-us/web/ip-location/): Where does your IP appear to be? The same tool, preconfigured. - [WHOIS lookup](https://how.box/en-us/web/whois/): How is this domain registered? Find the registrar, dates and name servers reported by 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/en-us/web/whois/?d={d} (d: text), e.g. https://how.box/en-us/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.) - [Wi-Fi card](https://how.box/en-us/printables/wifi-card/): How do I share my Wi-Fi with guests? A printable card with a QR code that joins your Wi-Fi when guests scan it with a phone camera. - 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/en-us/printables/wifi-card/?n={n}&t={t}&h={h}&g={g}>={gt}¬e={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/en-us/printables/wifi-card/?n=Guests&t=none&h=0&g=welcome>=Hello+neighbour¬e=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:;S:;P:;H:true;; with \ ; , : " escaped), which phone cameras offer to join.) - [Wind chill and heat index](https://how.box/en-us/earth/wind-chill/): How cold or hot does it really feel outside? The feels-like temperature: wind chill in the cold, heat index in the heat. - 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/en-us/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/en-us/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 wind scale](https://how.box/en-us/conversion/wind-scale/): How strong is the wind on the Beaufort scale? Turn a wind speed in m/s, km/h, knots or mph into its Beaufort force and name. - 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/en-us/conversion/wind-scale/?s={s}&u={u} (s: number 0 to 1000; u: ms, kmh, kt or mph), e.g. https://how.box/en-us/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).) - [Wind triangle calculator](https://how.box/en-us/aviation/wind-triangle/): What heading and ground speed do I need with this wind? The heading to fly, the wind correction angle and the ground speed for a course and wind, with the leg time, fuel and a drawn triangle. - 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/en-us/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/en-us/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.) - [Wire gauge converter](https://how.box/en-us/conversion/wire-gauge/): How many mm² is that AWG wire? Convert AWG to mm², kcmil and diameter, with the copper resistance per kilometre. - 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/en-us/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/en-us/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).) - [Word count](https://how.box/en-us/text/word-count/): How long is your text? Words, characters and reading time as you type. - 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/en-us/text/word-count/? (), e.g. https://how.box/en-us/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.) - [Working days in Finland](https://how.box/en-us/datetime/working-days/): How many working days in Finland are there between two dates? Count Finnish working days between two dates, or add working days to a date. - Addresses: en https://how.box/datetime/working-days/, en-us https://how.box/en-us/datetime/working-days/, fi https://how.box/fi/datetime/working-days/, de https://how.box/de/datetime/working-days/, es https://how.box/es/datetime/working-days/, fr https://how.box/fr/datetime/working-days/, sv https://how.box/sv/datetime/working-days/, it https://how.box/it/datetime/working-days/, et https://how.box/et/datetime/working-days/ - Link to an answer: https://how.box/en-us/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/en-us/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 (Finland). - 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).) - [World clock](https://how.box/en-us/datetime/world-clock/): What time is it in New York, London and Tokyo? Live clocks for the cities you pick, with the date, the offset, the difference to your own time and day or night. - 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/en-us/datetime/world-clock/?z={z}&at={at} (z: text; at: text), e.g. https://how.box/en-us/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-score calculator](https://how.box/en-us/math/z-score/): How unusual is this value? The z-score and percentile of a value on a normal distribution, the value at a percentile, or the chance between two values. - 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/en-us/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/en-us/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 time](https://how.box/en-us/datetime/zulu-time/): What time is it in Zulu (UTC)? The current Zulu time, and any Zulu time converted to local time and back, with the day-time group pilots use. - 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/en-us/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/en-us/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/en-us/about/accessibility/ - https://how.box/en-us/about/privacy/ - https://how.box/en-us/about/terms/ - https://how.box/en-us/about/agents/ ## Optional - [Full text](https://how.box/en-us/llms-full.txt): every tool's explanation and FAQ