# 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/es/agent-tools.json): descriptions and input schemas - [Catalog](https://how.box/es/catalog.json): utilities and answer-link parameters - [Full text](https://how.box/es/llms-full.txt): explanations and FAQ - [Agent terms and limits](https://how.box/es/about/agents/) ## Tools - [Calculadora de significación de test A/B](https://how.box/es/finance/ab-test/): ¿El resultado de tu test A/B es real o pura casualidad? Tasas de conversión, mejora, valor p e intervalo de confianza de un test A/B, con el tamaño de muestra que necesita. - 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/es/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/es/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).) - [Edad exacta](https://how.box/es/datetime/age/): ¿Cuántos años tienes exactamente? Tu edad en años, meses y días, los totales y tu próximo cumpleaños. - 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/es/datetime/age/?b={b}&d={d} (b: text; d: text), e.g. https://how.box/es/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).) - [Códigos de aerolíneas](https://how.box/es/aviation/airline-codes/): ¿A qué aerolínea pertenece este código? Busca una aerolínea por código IATA o ICAO, indicativo de radio o nombre: códigos, indicativo, país y si sigue operando. - 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/es/aviation/airline-codes/?q={q}&s={s}&c={c} (q: text; s: (empty), current or defunct; c: text), e.g. https://how.box/es/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.) - [Códigos de aeropuertos](https://how.box/es/aviation/airport-codes/): ¿A qué aeropuerto pertenece este código? Busca un aeropuerto por código IATA o ICAO, nombre o ciudad: códigos, ubicación, elevación y vuelos regulares. - 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/es/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/es/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).) - [Conversor de velocidad aerodinámica](https://how.box/es/aviation/airspeed/): ¿Cómo se relacionan IAS, CAS, TAS y Mach? Velocidad indicada, verdadera, equivalente y Mach a cualquier altitud y temperatura, con la regla del 2 % junto al resultado exacto. - 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/es/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/es/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.) - [Ajustes del altímetro](https://how.box/es/aviation/altimeter/): ¿Cómo se relacionan QNH, QFE y niveles de vuelo? Altitud con QNH, nivel de vuelo y QFE, conversión hPa ↔ inHg ↔ mmHg, nivel de transición, niveles de crucero y corrección por frío. - 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/es/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/es/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).) - [Conversor de ángulos](https://how.box/es/conversion/angle/): ¿Cuántos radianes mide ese ángulo? Convierte entre grados, radianes, gradianes, minutos y segundos de arco, vueltas y milésimas. - 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/es/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/es/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 [Grados a radianes](https://how.box/es/conversion/degrees-to-radians/): ¿Cómo se pasan los grados a radianes? The same tool, preconfigured. - [Calculadora de TAE](https://how.box/es/finance/apr/): ¿Cuánto te cuesta de verdad tu préstamo al año? Convierte el tipo de interés y las comisiones de un préstamo en una sola tasa anual equivalente (TAE) según la fórmula de la UE. - 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/es/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/es/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.) - [Conversor de áreas](https://how.box/es/conversion/area/): ¿Cuánto mide esa superficie en otras unidades? Convierte entre metros cuadrados, hectáreas, acres, pies cuadrados, millas cuadradas y más, con exactitud. - 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/es/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/es/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 a hectáreas](https://how.box/es/conversion/acres-to-hectares/): ¿Cuántas hectáreas tiene un acre? The same tool, preconfigured. - [Calculadora de relación de aspecto](https://how.box/es/media/aspect-ratio/): ¿Qué relación de aspecto tiene tu pantalla o imagen? Calcula la relación entre anchura y altura o cambia el tamaño de una imagen o vídeo sin deformarlo. - 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/es/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/es/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.) - [Calculadora de promedios](https://how.box/es/math/average/): ¿Cómo calculas la media de estos números? Media, mediana, moda y rango de una lista de números, con cantidad, suma, mínimo y máximo. - 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/es/math/average/?v={v} (v: text), e.g. https://how.box/es/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).) - [Generador de códigos de barras](https://how.box/es/media/barcode/): ¿Cómo creo un código de barras? EAN-13, EAN-8, UPC-A, Code 128 y códigos de barras bancarios finlandeses, listos para descargar. - 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/es/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/es/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 [Generador de código de barras bancario](https://how.box/es/media/bank-barcode/): ¿Cómo se crea el código de barras bancario de una factura? The same tool, preconfigured. - [Codificar y descodificar Base64](https://how.box/es/text/base64/): ¿Cómo conviertes texto o archivos a Base64? Codifica texto o archivos en Base64 y descodifícalos, directamente en tu navegador. - 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/es/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/es/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.) - [Tamaños de pilas](https://how.box/es/electronics/battery-sizes/): ¿Qué tamaño tiene una pila AA y cómo se llama en otros sitios? Todos los tamaños de pilas habituales, de AAA a D, 9 V, pilas de botón CR2032 y LR44 y 18650: medidas, tensión, nombres IEC y equivalencias. - 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/es/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/es/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).) - [Conversor de glucosa en sangre](https://how.box/es/health/blood-sugar/): ¿Cómo se pasa de mmol/L a mg/dL? Convierte la glucosa en sangre entre mmol/L y mg/dL, y la HbA1c entre mmol/mol y %, con la glucosa media estimada. - 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/es/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/es/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.) - [Calculadora de IMC](https://how.box/es/health/bmi/): ¿Cuál es tu índice de masa corporal (IMC)? Tu IMC, su categoría de la OMS para adultos, el intervalo de peso normal para tu estatura y lo que el IMC no puede indicar. - 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/es/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/es/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.) - [Calculadora de grasa corporal](https://how.box/es/health/body-fat/): ¿Cuánta grasa tiene tu cuerpo? Una estimación de tu porcentaje de grasa corporal con una cinta métrica: estatura, cuello y cintura, y la cadera en mujeres, por el método de la Marina de EE. UU. - 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/es/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/es/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).) - [Traductor de braille](https://how.box/es/text/braille/): ¿Cómo escribes tu texto en braille? Convierte texto a celdas de braille inglés unificado y viceversa: letras, mayúsculas, números y puntuación básica. - 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/es/text/braille/?d={d}&m={m} (d: encode or decode; m: text), e.g. https://how.box/es/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).) - [Calculadora del punto de equilibrio](https://how.box/es/finance/break-even/): ¿Cuántas unidades necesitas vender para cubrir costes? Calcula las unidades y las ventas que cubren tus costes fijos y variables. - Addresses: en https://how.box/finance/break-even/, en-us https://how.box/en-us/finance/break-even/, fi https://how.box/fi/finance/break-even/, de https://how.box/de/finance/break-even/, es https://how.box/es/finance/break-even/, fr https://how.box/fr/finance/break-even/, sv https://how.box/sv/finance/break-even/, it https://how.box/it/finance/break-even/, et https://how.box/et/finance/break-even/ - Link to an answer: https://how.box/es/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/es/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).) - [Comprobador de número de empresa](https://how.box/es/finance/business-id/): ¿Es válido este número de empresa? Comprueba el dígito de control del número de empresa finlandés y obtén el número de IVA correspondiente. - 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/es/finance/business-id/?id={id} (id: text), e.g. https://how.box/es/finance/business-id/?id=0112038-9. Served answer coverage: none (computed in the browser) - Runs entirely in the browser. Tags: checker, tax. Countries: FI (Finlandia). - 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.) - [Calendario para imprimir](https://how.box/es/printables/calendar/): ¿Cómo imprimo un calendario? Un año o un mes por página, con números de semana y festivos, listo para imprimir. - 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/es/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/es/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).) - [Calculadora de calorías diarias](https://how.box/es/health/calories/): ¿Cuántas calorías necesitas al día? Tu energía en reposo (TMB) y una estimación de tu gasto diario en kcal o kJ según tu edad, medidas y actividad. - 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/es/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/es/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.) - [Calculadora de calorías quemadas](https://how.box/es/health/calories-burned/): ¿Cuántas calorías quemas al hacer ejercicio? La energía que gastas en unas 200 actividades, de caminar y correr a nadar, esquiar o hacer tareas del hogar, según sus valores MET. - Addresses: en https://how.box/health/calories-burned/, en-us https://how.box/en-us/health/calories-burned/, fi https://how.box/fi/health/calories-burned/, de https://how.box/de/health/calories-burned/, es https://how.box/es/health/calories-burned/, fr https://how.box/fr/health/calories-burned/, sv https://how.box/sv/health/calories-burned/, it https://how.box/it/health/calories-burned/, et https://how.box/et/health/calories-burned/ - Link to an answer: https://how.box/es/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/es/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.) - [Calculadora de préstamo para coche](https://how.box/es/finance/car-loan/): ¿Cuánto te costará el préstamo del coche? Consulta la cuota mensual y el coste total de compra, incluidos entrada, coche entregado, impuestos y gastos. - 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/es/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/es/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.) - [Conversor de mayúsculas y minúsculas](https://how.box/es/text/case/): ¿Cómo quieres usar las mayúsculas en tu texto? Cambia las mayúsculas y minúsculas y copia cualquier versión. - 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/es/text/case/? (), e.g. https://how.box/es/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.) - [Reloj de ajedrez](https://how.box/es/datetime/chess-clock/): ¿Cuánto tiempo tiene cada jugador? Dos relojes de ajedrez con incremento o demora, contador de jugadas y caída de bandera al llegar a cero. - 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/es/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/es/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.) - [Buscador de acordes](https://how.box/es/music/chords/): ¿Cómo se toca este acorde? Elige fundamental y tipo de acorde para ver sus notas y fórmula en un piano, escucharlo o identificarlo a partir de las notas. - 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/es/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/es/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).) - [Círculo de quintas](https://how.box/es/music/circle-of-fifths/): ¿Cuántos sostenidos o bemoles tiene tu tonalidad? Elige una tonalidad en el círculo de quintas: consulta su armadura, relativa, escala y acordes, y escúchalos al 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/es/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/es/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.) - [Lector de QR y códigos de barras](https://how.box/es/media/code-scan/): ¿Cómo escaneo un QR o un código de barras? Escanea con la cámara o una imagen y comprueba qué contiene un código y adónde lleva realmente un enlace antes de abrirlo. - 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/es/media/code-scan/?f={f} (f: all, qr or linear), e.g. https://how.box/es/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 [Lector de códigos QR](https://how.box/es/media/qr-scan/): ¿Cómo escaneo un código QR con seguridad? The same tool, preconfigured. - Preset [Lector de códigos de barras](https://how.box/es/media/barcode-scan/): ¿Cómo leo un código de barras? The same tool, preconfigured. - [Conversor de colores](https://how.box/es/web/color/): ¿Cómo expresas un color en HEX, RGB o HSL? Elige o escribe un color y cópialo como HEX, RGB, HSL, HWB u OKLCH, con el nombre CSS más cercano. - 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/es/web/color/?c={c} (c: text), e.g. https://how.box/es/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.) - [Calculadora de combinaciones y permutaciones](https://how.box/es/math/combinations/): ¿De cuántas formas puedes elegirlos? El número exacto de combinaciones y permutaciones, con o sin repetición, y la probabilidad de una elección concreta. - 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/es/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/es/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 [Calculadora de probabilidades de lotería](https://how.box/es/math/lottery-odds/): ¿Qué probabilidad hay de ganar la lotería? The same tool, preconfigured. - [Calculadora de interés compuesto](https://how.box/es/finance/compound-interest/): ¿Cuánto crecerán tus ahorros con interés compuesto? Consulta el saldo final, tus aportaciones y los intereses ganados, año a año. - 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/es/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/es/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.) - [Calculadora de hormigón](https://how.box/es/everyday/concrete/): ¿Cuánto hormigón necesito? Metros o yardas cúbicas de hormigón y sacos de hormigón seco para una losa, una zapata o agujeros de postes. - 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/es/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/es/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.) - [Calculadora de intervalo de confianza](https://how.box/es/math/confidence-interval/): ¿Qué precisión tiene la estimación de tu muestra? El intervalo de confianza de una media o una proporción a partir de una muestra, con el margen de error y el método usado. - 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/es/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/es/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.) - [Comprobador de contraste de colores](https://how.box/es/web/contrast/): ¿Se lee bien este texto sobre este fondo? Comprueba el contraste WCAG entre texto y fondo, qué niveles cumple y un color cercano que los cumpla. - 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/es/web/contrast/?fg={fg}&bg={bg} (fg: text; bg: text), e.g. https://how.box/es/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.) - [Conversor de medidas de cocina](https://how.box/es/conversion/cooking/): ¿Cuántos gramos tiene una taza? Convierte cantidades de recetas según el ingrediente. - 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/es/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/es/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 [Taza de azúcar en gramos](https://how.box/es/conversion/cup-of-sugar-in-grams/): ¿Cuántos gramos tiene una taza de azúcar? The same tool, preconfigured. - Preset [Taza de mantequilla en gramos](https://how.box/es/conversion/cup-of-butter-in-grams/): ¿Cuántos gramos tiene una taza de mantequilla? The same tool, preconfigured. - [Cuenta atrás](https://how.box/es/datetime/countdown/): ¿Cuánto falta para el gran día? Días, horas, minutos y segundos hasta una fecha o hasta Año Nuevo, Navidad o San Juan, en directo y a pantalla completa. - 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/es/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/es/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 [Cuenta atrás para Navidad](https://how.box/es/datetime/christmas-countdown/): ¿Cuántos días faltan para Navidad? The same tool, preconfigured. - Preset [Cuenta atrás para Nochebuena](https://how.box/es/datetime/christmas-eve-countdown/): ¿Cuántos días faltan para Nochebuena? The same tool, preconfigured. - Preset [Cuenta atrás para San Juan](https://how.box/es/datetime/midsummer-countdown/): ¿Cuánto falta para la víspera de San Juan nórdica? The same tool, preconfigured. - [Códigos de países](https://how.box/es/everyday/country-codes/): ¿Cuáles son los códigos ISO, telefónicos y de dominio de un país? Códigos ISO 3166 alfa-2, alfa-3 y numéricos, prefijos telefónicos y dominios de 249 países y territorios. - 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/es/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/es/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 [Prefijos telefónicos internacionales](https://how.box/es/everyday/calling-codes/): ¿Cómo llamas a un número de otro país? The same tool, preconfigured. - Preset [Prefijos de matrículas de aeronaves](https://how.box/es/everyday/aircraft-prefixes/): ¿En qué país está matriculada una aeronave? The same tool, preconfigured. - [Calculadora de pago de tarjeta de crédito](https://how.box/es/finance/credit-card/): ¿Cuánto tardarás en saldar tu tarjeta de crédito? Consulta los meses hasta dejar el saldo a cero y los intereses que pagas, con una cuota fija o con el mínimo de la tarjeta. - 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/es/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/es/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).) - [Calculadora de viento cruzado](https://how.box/es/aviation/crosswind/): ¿Cuánto viento cruzado hay en la pista? Viento cruzado, de cara o de cola en cualquier pista, con rachas, diagrama y límite de viento cruzado de tu aeronave. - 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/es/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/es/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.) - [Conversor de unidades CSS](https://how.box/es/conversion/css-units/): ¿Cuántos rem son esos píxeles? Convierte longitudes CSS entre px, rem, em, pt, pc, in, cm, mm y Q según tu tamaño de fuente. - 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/es/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/es/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 a rem](https://how.box/es/conversion/px-to-rem/): ¿Cuántos rem son tantos píxeles? The same tool, preconfigured. - [Conversor de divisas](https://how.box/es/finance/currency/): ¿Cuánto vale esa cantidad en otra moneda? Convierte unas 30 divisas con los tipos diarios de referencia del Banco Central Europeo y muestra su fecha. - 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/es/finance/currency/?a={a}&f={f}&t={t} (a: number 0 to 1e12; f: text; t: text), e.g. https://how.box/es/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).) - [Códigos de moneda](https://how.box/es/finance/currency-codes/): ¿Cuál es el código de moneda del euro, el yen o el dólar? Todas las monedas en uso hoy con su código ISO 4217, código numérico, símbolo, decimales y los países que las usan, en tu idioma. - 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/es/finance/currency-codes/?q={q}&d={d}&c={c} (q: text; d: (empty), 0, 2 or 3; c: text), e.g. https://how.box/es/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.) - [Testigos del salpicadero](https://how.box/es/vehicles/dashboard-lights/): ¿Qué significa ese testigo del salpicadero? Encuentra un testigo del coche por su símbolo o su nombre: qué significa, qué urgencia indica su color y qué hacer ahora. - 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/es/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/es/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.) - [Conversor de tamaño de datos](https://how.box/es/conversion/data-size/): ¿Cuántos datos son en otras unidades? Convierte bytes, kilobytes, megabytes, gigabytes, MiB, GiB y bits, distinguiendo las bases 1000 y 1024. - 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/es/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/es/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 a gibibytes](https://how.box/es/conversion/gb-to-gib/): ¿Cuántos gibibytes tiene un gigabyte? The same tool, preconfigured. - [Diferencia entre fechas](https://how.box/es/datetime/date-diff/): ¿Cuántos días hay entre tus fechas? Días naturales, meses completos y días laborables de Finlandia. - 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/es/datetime/date-diff/?f={f}&t={t}&i={i} (f: text; t: text; i: boolean), e.g. https://how.box/es/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).) - [Calculadora de días-multa](https://how.box/es/finance/day-fine/): ¿Cuánto es un día-multa en Finlandia? Un día-multa y la multa total según tus ingresos netos y personas a cargo, conforme al Código Penal de Finlandia. - 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/es/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/es/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 (Finlandia). - Agent tools: `day_fine_calculate` (Finland only: one day-fine (päiväsakko) and the total fine under Rikoslaki 2 a luku and decree 609/1999.) - [Día de la semana](https://how.box/es/datetime/day-of-week/): ¿Qué día de la semana es? El día de la semana de cualquier fecha y cuántos días han pasado o faltan. - 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/es/datetime/day-of-week/?d={d} (d: text), e.g. https://how.box/es/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.) - [Calculadora para saldar deudas](https://how.box/es/finance/debt-payoff/): ¿Cuánto tardarás en pagar todas tus deudas? Consulta cuándo quedarás sin deudas y cuánto te cuestan los intereses, pagando primero el tipo más alto o la deuda más pequeña. - 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/es/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/es/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).) - [Conversor de horas decimales](https://how.box/es/datetime/decimal-hours/): ¿Cuántas horas decimales son 7 horas y 30 minutos? De horas y minutos a horas decimales y al revés, y el total de una hoja de horas en ambos formatos. - 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/es/datetime/decimal-hours/?t={t}&d={d} (t: text; d: whole number 0 to 4), e.g. https://how.box/es/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.) - [Conversor de densidad](https://how.box/es/conversion/density/): ¿Cuánto es esa densidad en otras unidades? Convierte entre kg/m³, g/cm³, kg/L, g/L, lb/ft³, lb/in³, oz/in³ y libras por galón. - 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/es/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/es/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).) - [Altitud de densidad](https://how.box/es/aviation/density-altitude/): ¿Cuál es la altitud de densidad hoy? Altitud de presión y altitud de densidad de tu aeródromo según elevación, QNH y temperatura, y qué implica el aire menos denso para despegar. - 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/es/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/es/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).) - [Planificador de descenso](https://how.box/es/aviation/descent/): ¿A qué distancia debo empezar a descender? Inicio de descenso, velocidad vertical y tiempo según ángulo o régimen, con la regla 3:1 junto al resultado exacto. - 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/es/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/es/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.) - [Calculadora del punto de rocío](https://how.box/es/earth/dew-point/): ¿A qué temperatura se empañarán tus ventanas? Calcula el punto de rocío a partir de la temperatura y la humedad, o la humedad a partir del punto de rocío. - 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/es/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/es/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.) - [Lanzador de dados](https://how.box/es/everyday/dice/): ¿Qué número saldrá en los dados? Lanza uno o varios dados, d20 o 3d6+2, con resultados equiprobables que puedes ver a pantalla completa. - 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/es/everyday/dice/?n={n} (n: text), e.g. https://how.box/es/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).) - [Calculadora de descuentos](https://how.box/es/everyday/discount/): ¿Cuánto pagarás después del descuento? Consulta el precio rebajado y cuánto ahorras. - 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/es/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/es/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.) - [Consulta DNS](https://how.box/es/web/dns/): ¿Cómo está configurado tu dominio en DNS? Consulta direcciones, servidores de correo y otros registros DNS. - Addresses: en https://how.box/web/dns/, en-us https://how.box/en-us/web/dns/, fi https://how.box/fi/web/dns/, de https://how.box/de/web/dns/, es https://how.box/es/web/dns/, fr https://how.box/fr/web/dns/, sv https://how.box/sv/web/dns/, it https://how.box/it/web/dns/, et https://how.box/et/web/dns/ - Link to an answer: https://how.box/es/web/dns/?h={h}&t={t} (h: text; t: A, AAAA, CNAME, MX, TXT, NS, SOA or CAA), e.g. https://how.box/es/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.) - [Calculadora de tiempo de descarga](https://how.box/es/web/download-time/): ¿Cuánto tardará tu descarga? Introduce el tamaño del archivo y la velocidad de conexión para calcular cuánto tarda una descarga o subida. - 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/es/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/es/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)).) - [Autonomía de vuelo de drones](https://how.box/es/aviation/drone-flight-time/): ¿Cuánto puede volar mi dron con una batería? Autonomía según mAh y voltaje o Wh de la batería y consumo medio, con reserva para aterrizar y energía en Wh. - Addresses: en https://how.box/aviation/drone-flight-time/, en-us https://how.box/en-us/aviation/drone-flight-time/, fi https://how.box/fi/aviation/drone-flight-time/, de https://how.box/de/aviation/drone-flight-time/, es https://how.box/es/aviation/drone-flight-time/, fr https://how.box/fr/aviation/drone-flight-time/, sv https://how.box/sv/aviation/drone-flight-time/, it https://how.box/it/aviation/drone-flight-time/, et https://how.box/et/aviation/drone-flight-time/ - Link to an answer: https://how.box/es/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/es/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).) - [Normativa de drones](https://how.box/es/aviation/drone-rules/): ¿Qué normas se aplican a mi dron? Categoría europea según peso y clase del dron, con registro, formación, edad y distancias a personas. - 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/es/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/es/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).) - [Caja de ritmos](https://how.box/es/music/drum-machine/): ¿Cómo suena tu propio ritmo de batería? Crea un patrón de 16 pasos con bombo, caja, charles, palmas y tom, reprodúcelo a tu tempo y toca los pads encima. - 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/es/music/drum-machine/?t={t}&p={p} (t: whole number 40 to 240; p: text), e.g. https://how.box/es/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.) - [Cambios de hora](https://how.box/es/datetime/dst/): ¿Cuándo es el próximo cambio de hora? El próximo y el último cambio de hora en cualquier huso horario, si los relojes se adelantan o se atrasan, y todos los cambios de un año. - 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/es/datetime/dst/?z={z}&y={y} (z: text; y: whole number 1970 to 2100), e.g. https://how.box/es/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.) - [Calculadora de fecha probable de parto](https://how.box/es/health/due-date/): ¿De cuántas semanas estás embarazada? Estima la fecha de parto, la semana y el trimestre a partir de la última regla, la concepción o una transferencia de FIV. - Addresses: en https://how.box/health/due-date/, en-us https://how.box/en-us/health/due-date/, fi https://how.box/fi/health/due-date/, de https://how.box/de/health/due-date/, es https://how.box/es/health/due-date/, fr https://how.box/fr/health/due-date/, sv https://how.box/sv/health/due-date/, it https://how.box/it/health/due-date/, et https://how.box/et/health/due-date/ - Link to an answer: https://how.box/es/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/es/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.) - [Calculadora de duración](https://how.box/es/datetime/duration/): ¿Cuánto tiempo es? Calcula el tiempo entre dos fechas y horas, suma o resta una duración o suma una lista de tiempos en hh:mm:ss. - Addresses: en https://how.box/datetime/duration/, en-us https://how.box/en-us/datetime/duration/, fi https://how.box/fi/datetime/duration/, de https://how.box/de/datetime/duration/, es https://how.box/es/datetime/duration/, fr https://how.box/fr/datetime/duration/, sv https://how.box/sv/datetime/duration/, it https://how.box/it/datetime/duration/, et https://how.box/et/datetime/duration/ - Link to an answer: https://how.box/es/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/es/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).) - [Valores normalizados de las series E](https://how.box/es/electronics/e-series/): ¿Qué valor normalizado de resistencia o condensador es el más cercano? Busca el valor de E3 a E192 más cercano al que necesitas, con sus vecinos y el 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/es/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/es/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).) - [Calculadora de coste eléctrico](https://how.box/es/finance/electricity-cost/): ¿Cuánto cuesta usar un electrodoméstico? Convierte la potencia, el uso diario y el precio de la electricidad en kWh y coste. - 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/es/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/es/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.) - [Calculadora del coste laboral](https://how.box/es/finance/employer-cost/): ¿Cuánto le cuesta un empleado al empleador en Finlandia? Lo que cuesta un salario mensual a un empleador en Finlandia, con las cotizaciones de pensiones, desempleo y seguro de enfermedad. - 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/es/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/es/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 (Finlandia). - 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).) - [Conversor de energía](https://how.box/es/conversion/energy/): ¿Cuánta energía es en otras unidades? Convierte entre julios, kilovatios hora, kilocalorías, BTU y otras unidades con definiciones exactas. - 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/es/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/es/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 [Kilocalorías a kilojulios](https://how.box/es/conversion/kcal-to-kj/): ¿Cuántos kilojulios tiene una kilocaloría? The same tool, preconfigured. - [Calculadora de carga de coche eléctrico](https://how.box/es/vehicles/ev-charging/): ¿Cuánto tarda en cargarse tu coche eléctrico y cuánto cuesta? Tiempo de carga, energía de la red y coste con cualquier cargador, con pérdidas y los límites de tu coche. - 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/es/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/es/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 [Calculadora de coste de carga eléctrica](https://how.box/es/vehicles/ev-charging-cost/): ¿Cuánto costará cargar tu coche eléctrico? The same tool, preconfigured. - Preset [Calculadora de tiempo de carga eléctrica](https://how.box/es/vehicles/ev-charging-time/): ¿Cuánto tardará en cargarse tu coche eléctrico? The same tool, preconfigured. - [Calculadora de autonomía de coche eléctrico](https://how.box/es/vehicles/ev-range/): ¿Hasta dónde llegará tu coche eléctrico? Calcula la autonomía a partir del tamaño de la batería, el consumo y el nivel de carga, con opción para tiempo frío. - 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/es/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/es/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 [Autonomía del coche eléctrico en invierno](https://how.box/es/vehicles/ev-winter-range/): ¿Hasta dónde llegará tu coche eléctrico en invierno? The same tool, preconfigured. - [Compensación por retraso de vuelo](https://how.box/es/aviation/flight-delay-compensation/): ¿Cuánto te corresponde por el retraso de tu vuelo? Comprueba EU 261 y UK 261: 250–600 € o 220–520 £ por retraso, cancelación o sobreventa, con el motivo. - 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/es/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/es/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.) - [Hora de llegada del vuelo](https://how.box/es/everyday/flight-time/): ¿A qué hora local aterrizará mi vuelo? La hora local de aterrizaje a partir de la hora de salida y las horas de vuelo, entre husos horarios, con el horario de verano y la línea de cambio de fecha. - 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/es/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/es/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.) - [Conversor de fuerza](https://how.box/es/conversion/force/): ¿Cuánta fuerza es esa en otras unidades? Convierte entre newtons, kilonewtons, kilogramos-fuerza, libras-fuerza, kips, dinas y 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/es/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/es/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).) - [Calculadora de fracciones](https://how.box/es/math/fraction/): ¿Cuánto es en fracciones? Suma, resta, multiplica y divide fracciones y números mixtos, o convierte un decimal en fracción, con el resultado simplificado. - 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/es/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/es/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.) - [Calculadora de gasto de combustible](https://how.box/es/everyday/fuel-cost/): ¿Cuánto gastarás en combustible en tu viaje? Calcula el combustible y el coste de un viaje a partir de la distancia, el consumo y el precio del combustible. - 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/es/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/es/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.) - [Conversor de consumo de combustible](https://how.box/es/conversion/fuel-economy/): ¿Cuánto consume tu coche en otras unidades? Convierte entre L/100 km, km/L, millas por galón (estadounidense e imperial) y consumo eléctrico en kWh/100 km y 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/es/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/es/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 [Millas por galón a L/100 km](https://how.box/es/conversion/mpg-to-l-100km/): ¿Cuántos litros por 100 km son tus mpg? The same tool, preconfigured. - Preset [Consumo de coche eléctrico](https://how.box/es/conversion/ev-consumption/): ¿Cuál es la eficiencia de tu coche eléctrico? The same tool, preconfigured. - [Reloj a pantalla completa](https://how.box/es/datetime/fullscreen-clock/): ¿Qué hora es? Un reloj fácil de leer en tu escritorio o desde cualquier punto de la habitación. - 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/es/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/es/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 - [Calculadora de MCD y mcm](https://how.box/es/math/gcd/): ¿Qué tienen en común estos números? El máximo común divisor y el mínimo común múltiplo de dos a diez números enteros, con los pasos de Euclides. - 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/es/math/gcd/?n={n}&s={s} (n: text; s: gcd or lcm), e.g. https://how.box/es/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 [Calculadora de mcm](https://how.box/es/math/lcm/): ¿Cuál es el mínimo común múltiplo? The same tool, preconfigured. - [Calculadora del impuesto de donaciones](https://how.box/es/finance/gift-tax/): ¿Cuánto impuesto de donaciones se paga por un regalo en Finlandia? El impuesto de donaciones finlandés sobre un regalo, sumando las donaciones anteriores del mismo donante en los últimos tres años. - 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/es/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/es/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 (Finlandia). - 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 €).) - [Papel cuadriculado](https://how.box/es/printables/graph-paper/): ¿Cómo imprimo papel cuadriculado al tamaño correcto? Una cuadrícula a la medida de tu papel. - 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/es/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/es/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.) - [Generador de hash](https://how.box/es/web/hash/): ¿Cómo obtengo el hash de un texto? Hashes SHA-256, SHA-512, SHA-1 y MD5 de cualquier texto, calculados en tu navegador. - 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/es/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/es/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.) - [Calculadora de zonas de frecuencia cardiaca](https://how.box/es/health/heart-rate/): ¿A qué ritmo debería latir tu corazón al entrenar? Tu frecuencia cardiaca máxima estimada y cinco zonas de entrenamiento a partir de tu edad y tu pulso en reposo, por el método de Karvonen. - 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/es/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/es/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.) - [Festivos de Finlandia](https://how.box/es/datetime/holidays/): ¿Cuándo son los próximos festivos en Finlandia? Festivos y vísperas en Finlandia para cualquier año, con el día de la semana y los días que faltan para el próximo. - 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/es/datetime/holidays/?y={y}&v={v} (y: whole number 1992 to 2100; v: all or flag_days), e.g. https://how.box/es/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 (Finlandia). - 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 [Días de izado de bandera en Finlandia](https://how.box/es/datetime/flag-days/): ¿Cuándo se iza la bandera en Finlandia? The same tool, preconfigured. - [Potencia del cargador doméstico](https://how.box/es/vehicles/home-charger/): ¿Con qué rapidez puedes cargar tu coche en casa? De fases, amperios y voltios a la potencia de carga y al tiempo que tarda en entrar la energía que necesitas. - 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/es/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/es/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 [Cargador de 11 kW](https://how.box/es/vehicles/11-kw-charger/): ¿Cuánto tarda un cargador de 11 kW en cargar tu coche? The same tool, preconfigured. - [Códigos de estado HTTP](https://how.box/es/web/http-status/): ¿Qué significa el estado HTTP 404? Busca cualquier código de estado HTTP: qué significa 200, 301, 404, 429 o 503, cuándo lo envía un servidor, si las cachés lo guardan y qué RFC lo define. - 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/es/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/es/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.) - [Comprobador de IBAN](https://how.box/es/finance/iban/): ¿Es válido este IBAN? Comprueba los dígitos de control de un IBAN y míralo en formato impreso, parte por parte. - 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/es/finance/iban/?iban={iban} (iban: text), e.g. https://how.box/es/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.) - [Comprimir imágenes](https://how.box/es/media/image-compress/): ¿Cuánto puedes reducir tu imagen? Reduce el archivo de una foto y consulta cuánto ahorras. La imagen se queda en tu dispositivo. - 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/es/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/es/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 [Comprimir imagen a 100 KB](https://how.box/es/media/compress-image-to-100kb/): ¿Cómo reducir una foto a menos de 100 KB? The same tool, preconfigured. - [Convertir imágenes](https://how.box/es/media/image-convert/): ¿Cómo cambio el formato de una imagen? Convierte una imagen entre PNG, JPEG, WebP y AVIF. La imagen se queda en tu dispositivo. - 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/es/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/es/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.) - [Redimensionar imágenes](https://how.box/es/media/image-resize/): ¿Qué tamaño debe tener tu imagen? Cambia el tamaño de una foto por anchura, altura o porcentaje. La imagen se queda en tu dispositivo. - 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/es/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/es/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.) - [Calculadora del impuesto de sucesiones](https://how.box/es/finance/inheritance-tax/): ¿Cuánto impuesto de sucesiones pagarás en Finlandia? El impuesto de sucesiones finlandés sobre tu parte, según la clase fiscal, las deducciones y la escala de la fecha del fallecimiento. - 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/es/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/es/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 (Finlandia). - 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 €).) - [Temporizador de intervalos](https://how.box/es/datetime/interval-timer/): ¿Cuánto dura tu entrenamiento, ronda a ronda? Rondas de esfuerzo y descanso con una pantalla grande y un sonido en cada cambio. - 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/es/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/es/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).) - [¿Está caída la web?](https://how.box/es/web/is-it-down/): ¿Cómo responde esta web? Comprueba la respuesta de una web desde nuestro servidor. - 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/es/web/is-it-down/?u={u} (u: text), e.g. https://how.box/es/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.) - [Formateador JSON](https://how.box/es/web/json/): ¿Cómo formateo y compruebo un JSON? Pega JSON para encontrar errores, darle formato o compactarlo. - 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/es/web/json/?mode={mode}&indent={indent}&sort={sort} (mode: pretty or minify; indent: 2, 4 or tab; sort: boolean), e.g. https://how.box/es/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.) - [Prueba de teclado](https://how.box/es/media/keyboard-test/): ¿Cómo funciona tu teclado? Pulsa teclas para ver sus códigos y llevar la cuenta de las que has probado. - 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/es/media/keyboard-test/?layout={layout} (layout: ansi or iso), e.g. https://how.box/es/media/keyboard-test/?layout=iso. Served answer coverage: none (computed in the browser) - Runs entirely in the browser. Tags: checker. - Agent tools: none - [Calculadora de intereses de demora](https://how.box/es/finance/late-interest/): ¿Cuántos intereses de demora se deben en Finlandia? Intereses de demora legales de una deuda vencida en Finlandia: el tipo de referencia más 7 puntos, semestre a semestre. - Addresses: en https://how.box/finance/late-interest/, en-us https://how.box/en-us/finance/late-interest/, fi https://how.box/fi/finance/late-interest/, de https://how.box/de/finance/late-interest/, es https://how.box/es/finance/late-interest/, fr https://how.box/fr/finance/late-interest/, sv https://how.box/sv/finance/late-interest/, it https://how.box/it/finance/late-interest/, et https://how.box/et/finance/late-interest/ - Link to an answer: https://how.box/es/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/es/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 (Finlandia). - 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.) - [Símbolos de lavado](https://how.box/es/everyday/laundry-symbols/): ¿Cómo se leen los símbolos de la etiqueta de la ropa? Cada símbolo de cuidado explicado: cubeta, triángulo, cuadrado, plancha y círculo, con temperaturas, puntos y barras en palabras sencillas. - 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/es/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/es/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.) - [Calculadora de hora de salida](https://how.box/es/everyday/leave-by/): ¿A qué hora tengo que salir para llegar a tiempo? La hora límite para salir: tu hora de llegada menos el trayecto, las paradas y un margen de seguridad, también entre husos horarios. - 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/es/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/es/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).) - [Calculadora de ahorro con bombillas LED](https://how.box/es/everyday/led-savings/): ¿Cuánto ahorrarás si cambias a bombillas LED? Compara una bombilla antigua con una LED: la energía y el dinero que ahorras al año y cuándo se amortiza la LED. - 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/es/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/es/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.) - [Conversor de longitud](https://how.box/es/conversion/length/): ¿Cuánto mide en otras unidades? Convierte longitudes métricas y anglosajonas con exactitud. - 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/es/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/es/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 [Millas a kilómetros](https://how.box/es/conversion/miles-to-km/): ¿Cuántos kilómetros tiene una milla? The same tool, preconfigured. - Preset [Centímetros a pulgadas](https://how.box/es/conversion/cm-to-inches/): ¿Cuántas pulgadas tiene un centímetro? The same tool, preconfigured. - Preset [Pulgadas a centímetros](https://how.box/es/conversion/inches-to-cm/): ¿Cuántos centímetros tiene una pulgada? The same tool, preconfigured. - Preset [Pies a metros](https://how.box/es/conversion/feet-to-metres/): ¿Cuántos metros tiene un pie? The same tool, preconfigured. - [Calculadora de préstamos](https://how.box/es/finance/loan/): ¿Cuánto te costará de verdad tu préstamo? Cuotas, intereses y comisiones de un préstamo de cuota constante o amortización constante, con pagos mensuales o menos frecuentes. - 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/es/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/es/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.) - [Puertas lógicas](https://how.box/es/electronics/logic-gates/): ¿Cómo funcionan las puertas AND, OR, NOT y XOR? Cambia las entradas y ve al instante la salida de cada puerta lógica, con su símbolo en los dos estilos normalizados, su expresión booleana y su tabla de verdad. - 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/es/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/es/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.) - [Comprobador de tamaño de equipaje](https://how.box/es/everyday/luggage-size/): ¿Cumple mi maleta los límites de tamaño? Compara alto, ancho, fondo y peso con cualquier límite, con la suma L + A + H, un dibujo y medidas en centímetros o pulgadas. - 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/es/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/es/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 [Equipaje de cabina por aerolínea](https://how.box/es/everyday/cabin-baggage/): ¿Cabe mi maleta en la cabina? The same tool, preconfigured. - [Calculadora de macros](https://how.box/es/health/macros/): ¿Cuántos gramos de proteína, grasa e hidratos son? Convierte un objetivo diario de calorías y un reparto en porcentaje en gramos de proteína, grasa e hidratos de carbono, al día y por comida. - 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/es/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/es/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.) - [Calculadora de margen](https://how.box/es/finance/margin/): ¿Cuánto margen ganas con una venta? Calcula el margen de beneficio, el markup y el beneficio a partir del coste y el precio de venta. - 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/es/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/es/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 [Calculadora de markup](https://how.box/es/finance/markup/): ¿Cuánto es tu markup? The same tool, preconfigured. - [Ejercicios de cálculo](https://how.box/es/kids/math-drills/): ¿Qué tal se te da el cálculo? Practica a tu ritmo o imprime una ficha para resolverla en papel. - 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/es/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/es/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.) - [Planificador de reuniones](https://how.box/es/datetime/meeting-planner/): ¿Cómo encuentro una hora de reunión que encaje en todos los husos horarios? Elige de dos a seis lugares y un día para ver una tabla de horas, los horarios laborales y la mejor hora para todos. - 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/es/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/es/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.) - [Decodificador METAR y TAF](https://how.box/es/aviation/metar/): ¿Cómo se lee un METAR o TAF? Pega un informe meteorológico aeronáutico y lee cada grupo en palabras claras, con categoría de vuelo, humedad y altitud de densidad. - 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/es/aviation/metar/?r={r} (r: text), e.g. https://how.box/es/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.) - [Metrónomo: pulso constante para practicar música](https://how.box/es/music/metronome/): ¿Cómo mantienes un pulso constante? Ajusta el tempo, escucha el pulso y sigue el péndulo. - 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/es/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/es/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.) - [Prueba de micrófono](https://how.box/es/media/mic-test/): ¿Funciona mi micrófono? Pulsa Iniciar y habla: el medidor muestra lo que capta tu micrófono. - 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/es/media/mic-test/?p={p} (p: raw or voice), e.g. https://how.box/es/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.) - [Calculadora de kilometraje](https://how.box/es/finance/mileage/): ¿Cuánto puedes cobrar por kilometraje sin impuestos en Finlandia? La indemnización por kilometraje y las dietas exentas de impuestos en Finlandia para un viaje de trabajo, con los importes de la Administración Tributaria. - 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/es/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/es/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 (Finlandia). - 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).) - [Consulta de direcciones Mode S](https://how.box/es/aviation/mode-s/): ¿De qué país es la dirección del transpondedor de una aeronave? Introduce una dirección Mode S o ADS-B de 24 bits en hexadecimal, octal o binario para ver a qué bloque nacional pertenece. - 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/es/aviation/mode-s/?a={a}&b={b} (a: text; b: hex, octal or binary), e.g. https://how.box/es/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.) - [Fase lunar](https://how.box/es/datetime/moon-phase/): ¿En qué fase está la Luna? La fase de la Luna ahora o en cualquier fecha, con la parte iluminada y las próximas lunas nueva y llena. - 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/es/datetime/moon-phase/?d={d}&lat={lat}&lon={lon}&z={z} (d: text; lat: text; lon: text; z: text), e.g. https://how.box/es/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.) - [Traductor de código morse](https://how.box/es/text/morse/): ¿Cómo se escribe, reproduce y escucha el código morse? Convierte texto a morse y viceversa, reprodúcelo como sonido o luz, decodifícalo con micrófono o cámara, o transmítelo a mano. - 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/es/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/es/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.) - [Entrenador de morse](https://how.box/es/text/morse-trainer/): ¿Cómo aprendes a recibir morse de oído? Aprende morse con el método Koch: escucha grupos aleatorios a velocidad completa, escríbelos y añade un carácter al alcanzar un 90 % de aciertos. - 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/es/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/es/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).) - [Simulador de hipoteca](https://how.box/es/finance/mortgage/): ¿Cuánto te costará de verdad tu hipoteca cada mes? Consulta la cuota mensual, los intereses totales y cómo baja tu préstamo con el tiempo. - 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/es/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/es/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.) - [Información del navegador](https://how.box/es/web/my-browser/): ¿Cómo se identifica tu navegador? Datos declarados del navegador, motor y dispositivo. - 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/es/web/my-browser/?facet={facet} (facet: identity, update, agent, display, chrome or tesla), e.g. https://how.box/es/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 [Actualización del navegador](https://how.box/es/web/is-my-browser-up-to-date/): ¿Está actualizado mi navegador? The same tool, preconfigured. - Preset [Identificación del navegador](https://how.box/es/web/what-browser-am-i-using/): ¿Qué navegador estoy usando? The same tool, preconfigured. - Preset [Mi agente de usuario](https://how.box/es/web/my-user-agent/): ¿Cuál es mi cadena de agente de usuario? The same tool, preconfigured. - Preset [Mi resolución de pantalla](https://how.box/es/web/my-screen-resolution/): ¿Cuál es mi resolución de pantalla? The same tool, preconfigured. - Preset [Versión de Chrome](https://how.box/es/web/chrome-version/): ¿Qué versión de Chrome tengo? The same tool, preconfigured. - Preset [Navegador de Tesla](https://how.box/es/web/tesla-browser/): ¿Qué versión de Chrome usa el navegador de mi Tesla? The same tool, preconfigured. - [Calculadora de sueldo neto](https://how.box/es/finance/net-salary/): ¿Cuánto te queda de tu sueldo después de impuestos? Del bruto al neto en Alemania, Estonia o Finlandia, con cada impuesto y cotización. - 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/es/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/es/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 (Alemania), EE (Estonia), FI (Finlandia). - 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 [Calculadora Brutto-Netto](https://how.box/es/finance/brutto-netto-rechner/): ¿Cuánto te queda de tu sueldo bruto en Alemania? The same tool, preconfigured. - Preset [Calculadora de sueldo para Estonia](https://how.box/es/finance/palgakalkulaator/): ¿Cuánto neto deja un sueldo bruto en Estonia? The same tool, preconfigured. - Preset [Calculadora de sueldo neto para Finlandia](https://how.box/es/finance/nettopalkka/): ¿Cuánto neto deja un sueldo bruto en Finlandia? The same tool, preconfigured. - [Frecuencia de notas](https://how.box/es/music/note-frequency/): ¿Qué frecuencia tiene una nota musical? Convierte notas a hercios o frecuencias a su nota más cercana, con cents, número MIDI, tabla de octava y sonido. - 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/es/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/es/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 [Nombres de notas](https://how.box/es/music/note-names/): ¿Cómo se llaman las notas en otros idiomas? The same tool, preconfigured. - [Calculadora de VAN y TIR](https://how.box/es/finance/npv/): ¿Cuánto vale hoy una inversión? Descuenta una lista de flujos de caja anuales al dinero de hoy y halla la tasa con la que la inversión queda en equilibrio. - 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/es/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/es/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).) - [Conversor de bases numéricas](https://how.box/es/math/number-base/): ¿Cómo convierto un número entre bases? Convierte enteros entre binario, octal, decimal, hexadecimal y cualquier base hasta 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/es/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/es/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 [Conversor de hexadecimal a decimal](https://how.box/es/math/hex-to-decimal/): ¿Cuánto es un número hexadecimal en decimal? The same tool, preconfigured. - [Calculadora de la ley de Ohm](https://how.box/es/physics/ohms-law/): ¿Cuánta corriente circula y cuánta potencia se consume? Indica dos de estas magnitudes: tensión, corriente, resistencia y potencia, y obtén las otras dos. - 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/es/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/es/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.) - [Conversor de monedas antiguas](https://how.box/es/finance/old-currency/): ¿Cuánto vale hoy en euros el dinero antiguo? Marcos, francos, liras y las demás monedas sustituidas por el euro a su cambio fijo; el marco finlandés, también a valor actual. - 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/es/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/es/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 [Conversor mummonmarkka](https://how.box/es/finance/mummonmarkka/): ¿Cuánto es en marcos finlandeses? The same tool, preconfigured. - Preset [Calculadora de inflación de Finlandia](https://how.box/es/finance/inflation/): ¿Cuánto valen hoy 100 € de 2005? The same tool, preconfigured. - [Calculadora de 1RM](https://how.box/es/health/one-rep-max/): ¿Cuánto podrías levantar en una sola repetición? Tu repetición máxima (1RM) estimada a partir de una serie que hayas hecho, con los pesos para 1 a 12 repeticiones, por la fórmula de Epley o de Brzycki. - Addresses: en https://how.box/health/one-rep-max/, en-us https://how.box/en-us/health/one-rep-max/, fi https://how.box/fi/health/one-rep-max/, de https://how.box/de/health/one-rep-max/, es https://how.box/es/health/one-rep-max/, fr https://how.box/fr/health/one-rep-max/, sv https://how.box/sv/health/one-rep-max/, it https://how.box/it/health/one-rep-max/, et https://how.box/et/health/one-rep-max/ - Link to an answer: https://how.box/es/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/es/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.) - [Calculadora de ritmo de carrera](https://how.box/es/health/pace/): ¿A qué ritmo necesitas correr? Convierte un tiempo final en ritmo y velocidad, o un ritmo en tiempo final, con parciales por kilómetro o milla. - 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/es/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/es/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 [Calculadora de ritmo para maratón](https://how.box/es/health/marathon-pace/): ¿Qué ritmo necesitas para tu objetivo en el maratón? The same tool, preconfigured. - Preset [Calculadora de ritmo para media maratón](https://how.box/es/health/half-marathon-pace/): ¿Qué ritmo necesitas para tu objetivo en la media maratón? The same tool, preconfigured. - [Calculadora de pintura](https://how.box/es/everyday/paint/): ¿Cuánta pintura necesito para una habitación? Litros o galones de pintura y botes enteros que comprar, según el tamaño de la habitación, las manos y el rendimiento del bote. - 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/es/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/es/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.) - [Tamaños de papel](https://how.box/es/conversion/paper-size/): ¿Cuánto mide ese tamaño de papel? Consulta las series A, B y C y los formatos Carta, Legal y Tabloide en milímetros, centímetros, pulgadas o puntos. - 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/es/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/es/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.) - [Foto de pasaporte](https://how.box/es/media/passport-photo/): ¿Cómo hacer una foto de pasaporte del tamaño correcto? Recorta tu propia foto al tamaño oficial de pasaporte, con guías para la cabeza, y guárdala como archivo o como hoja de impresión. Nunca sale de tu dispositivo. - 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/es/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/es/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.) - [Generador de contraseñas](https://how.box/es/web/password/): ¿Cómo de segura debe ser tu nueva contraseña? Una contraseña aleatoria creada en tu dispositivo, con su resistencia en bits y sin enviar nada. - 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/es/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/es/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.) - [Calculadora de porcentajes](https://how.box/es/math/percentage/): ¿Cuánto es en porcentaje? Porcentaje de un número, proporción entre dos números, variación y diferencia porcentual, y valor anterior a un descuento. - 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/es/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/es/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 [Calculadora de variación porcentual](https://how.box/es/math/percentage-change/): ¿Cuánto ha subido o bajado en porcentaje? The same tool, preconfigured. - [Calculadora de edad de mascotas](https://how.box/es/everyday/pet-age/): ¿Cuántos años humanos tiene tu mascota? La edad de tu perro o gato en años humanos según la ciencia actual, sin la antigua regla ×7, y su etapa vital. - 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/es/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/es/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 [Calculadora de edad de perros](https://how.box/es/everyday/dog-age/): ¿Cuántos años humanos tiene tu perro? The same tool, preconfigured. - Preset [Calculadora de edad de gatos](https://how.box/es/everyday/cat-age/): ¿Cuántos años humanos tiene tu gato? The same tool, preconfigured. - [Piano](https://how.box/es/music/piano/): ¿Qué tal si tocas el piano aquí mismo? Toca un piano de dos octavas con ratón, pantalla táctil, teclado del ordenador o MIDI, con resonancia y nombres de notas. - 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/es/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/es/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).) - [Sorteo de nombres](https://how.box/es/everyday/picker/): ¿A quién le tocará? Gira la ruleta para elegir ganadores de tu lista o repartir a todos en equipos equilibrados. - 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/es/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/es/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).) - [Temporizador Pomodoro](https://how.box/es/datetime/pomodoro/): ¿Cuánto tiempo conviene concentrarte antes de descansar? Sesiones de concentración y descansos en ciclos, con un sonido al terminar cada fase. - 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/es/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/es/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.) - [Conversor de potencia](https://how.box/es/conversion/power/): ¿Cuánta potencia es en otras unidades? Convierte entre vatios, kilovatios, megavatios, caballos de potencia mecánicos y métricos y BTU por hora con exactitud. - 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/es/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/es/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 [Caballos de potencia a kilovatios](https://how.box/es/conversion/hp-to-kw/): ¿Cuántos kilovatios tiene un caballo de potencia? The same tool, preconfigured. - [Calculadora de PPI de pantalla](https://how.box/es/media/ppi/): ¿Qué nitidez tiene tu pantalla? Introduce la resolución y el tamaño para calcular los píxeles por pulgada, su separación y las dimensiones físicas de la pantalla. - 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/es/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/es/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.) - [Calculadora de valor actual](https://how.box/es/finance/present-value/): ¿Cuánto vale hoy el dinero que recibirás en el futuro? Descuenta un importe futuro a dinero de hoy con el tipo que elijas. - 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/es/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/es/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.) - [Conversor de presión](https://how.box/es/conversion/pressure/): ¿Cuánta presión es en otras unidades? Convierte entre pascales, hectopascales, kilopascales, bar, psi, atmósferas, mmHg e 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/es/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/es/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).) - [Comprobador de números primos](https://how.box/es/math/prime/): ¿Es primo tu número? Comprueba si un entero de hasta 100 cifras es primo, con sus factores primos y los primos anterior y siguiente. - 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/es/math/prime/?n={n} (n: text), e.g. https://how.box/es/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?) - [Ruleta de premios](https://how.box/es/everyday/prize-wheel/): ¿Qué premio te tocará? Enumera los premios, gira la ruleta y repártelos uno a uno: un sorteo justo para fiestas y eventos. - 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/es/everyday/prize-wheel/?p={p}&c={c}&r={r} (p: text; c: whole number 5 to 100; r: boolean), e.g. https://how.box/es/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.) - [Calculadora de alcohol en sangre](https://how.box/es/health/promille/): ¿Cuánto alcohol tienes en la sangre? Una estimación aproximada de tu alcohol en sangre en tanto por mil (‰) y de cuánto tarda tu cuerpo en eliminarlo, con la fórmula de Widmark. - Addresses: en https://how.box/health/promille/, en-us https://how.box/en-us/health/promille/, fi https://how.box/fi/health/promille/, de https://how.box/de/health/promille/, es https://how.box/es/health/promille/, fr https://how.box/fr/health/promille/, sv https://how.box/sv/health/promille/, it https://how.box/it/health/promille/, et https://how.box/et/health/promille/ - Link to an answer: https://how.box/es/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/es/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.) - [Generador de códigos QR](https://how.box/es/media/qr-code/): ¿Cómo creo un código QR? Códigos estáticos creados en tu dispositivo: sin caducidad, redirecciones ni seguimiento de escaneos. - 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/es/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/es/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 [Código QR Wi-Fi](https://how.box/es/media/wifi-qr/): ¿Cómo creo un código QR para mi Wi-Fi? The same tool, preconfigured. - Preset [QR de contacto (vCard)](https://how.box/es/media/vcard-qr/): ¿Cómo pongo mis datos de contacto en un QR? The same tool, preconfigured. - Preset [QR de correo electrónico](https://how.box/es/media/email-qr/): ¿Cómo creo un QR que abra un correo electrónico? The same tool, preconfigured. - Preset [QR de SMS](https://how.box/es/media/sms-qr/): ¿Cómo creo un QR para enviar un SMS? The same tool, preconfigured. - Preset [QR de evento](https://how.box/es/media/event-qr/): ¿Cómo creo un QR para un evento de calendario? The same tool, preconfigured. - Preset [QR de ubicación](https://how.box/es/media/geo-qr/): ¿Cómo creo un QR para una ubicación? The same tool, preconfigured. - Preset [QR de pago (EPC QR)](https://how.box/es/media/payment-qr/): ¿Cómo creo un QR para una transferencia bancaria? The same tool, preconfigured. - [Número aleatorio](https://how.box/es/everyday/random-number/): ¿Qué número elegirá el azar? Números aleatorios sin sesgo del generador seguro de tu dispositivo, con o sin repeticiones. - 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/es/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/es/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 [Lanzar una moneda](https://how.box/es/everyday/coin-flip/): ¿Cara o cruz? The same tool, preconfigured. - [Calculadora de razones](https://how.box/es/math/ratio/): ¿Cómo simplifico una razón o encuentro el número que falta? Simplifica una razón o encuentra el término que falta en una razón equivalente con la regla de tres. - 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/es/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/es/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).) - [Generador de número de referencia](https://how.box/es/finance/reference-number/): ¿Cómo se crea un número de referencia válido? Crea un número de referencia finlandés con su dígito de control, o comprueba uno, también en formato RF. - Addresses: en https://how.box/finance/reference-number/, en-us https://how.box/en-us/finance/reference-number/, fi https://how.box/fi/finance/reference-number/, de https://how.box/de/finance/reference-number/, es https://how.box/es/finance/reference-number/, fr https://how.box/fr/finance/reference-number/, sv https://how.box/sv/finance/reference-number/, it https://how.box/it/finance/reference-number/, et https://how.box/et/finance/reference-number/ - Link to an answer: https://how.box/es/finance/reference-number/?m={m}&r={r}&b={b} (m: check or create; r: text; b: text), e.g. https://how.box/es/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 (Finlandia). - 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.) - [Calculadora de refinanciación](https://how.box/es/finance/refinance/): ¿Cuánto podrías ahorrar al refinanciar? Compara la nueva cuota con los gastos de formalización y los intereses pendientes de tu préstamo actual. - 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/es/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/es/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.) - [Calculadora de alquilar o comprar](https://how.box/es/finance/rent-vs-buy/): ¿Es mejor alquilar o comprar tu vivienda? Compara alquilar y comprar durante los años que piensas quedarte, con todos los supuestos a la vista. - 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/es/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/es/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).) - [Código de colores de resistencias](https://how.box/es/physics/resistor/): ¿Cómo se leen las bandas de color de una resistencia? Convierte 4, 5 o 6 bandas de color en ohmios y tolerancia, o busca las bandas de un valor. - 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/es/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/es/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).) - [Calculadora de ROI](https://how.box/es/finance/roi/): ¿Cuánto ha rendido tu inversión? Calcula la rentabilidad total, la ganancia y la tasa anual equivalente. - 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/es/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/es/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 [Calculadora de CAGR](https://how.box/es/finance/cagr/): ¿Cuánto ha crecido cada año? The same tool, preconfigured. - [Conversor de números romanos](https://how.box/es/conversion/roman/): ¿Cómo se escribe en números romanos? Convierte números a romanos o al revés, en la forma estándar del 1 al 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/es/conversion/roman/?v={v} (v: text), e.g. https://how.box/es/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).) - [Conversor de salario](https://how.box/es/finance/salary/): ¿Cuánto cobras en otro periodo? Compara el salario bruto según tu jornada laboral. - 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/es/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/es/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.) - [Calculadora de tamaño de muestra](https://how.box/es/math/sample-size/): ¿Cuántas respuestas necesita tu encuesta? Las respuestas de encuesta que necesitas para un margen de error y un nivel de confianza, sea cual sea el tamaño de la población. - 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/es/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/es/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.) - [Calculadora de objetivo de ahorro](https://how.box/es/finance/savings-goal/): ¿Cuánto necesitas ahorrar para alcanzar tu objetivo? Calcula la aportación mensual o anual que hará crecer tus ahorros hasta el objetivo a tiempo. - 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/es/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/es/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.) - [Calculadora científica](https://how.box/es/math/scientific/): ¿Cuánto da el resultado? Escribe una operación o usa las teclas. - 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/es/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/es/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.) - [Conversor de notación científica](https://how.box/es/math/scientific-notation/): ¿Cómo se escribe este número en notación científica? Escribe un número en notación científica y de ingeniería con las cifras significativas que elijas, o convierte 6.022e23 a su forma completa. - 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/es/math/scientific-notation/?n={n}&s={s} (n: text; s: whole number 1 to 20), e.g. https://how.box/es/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.) - [Alfabeto semafórico de banderas](https://how.box/es/text/semaphore/): ¿Cómo se escribe tu nombre con banderas semafóricas? Convierte texto en figuras de banderas semafóricas o lee una letra a partir de la posición de los brazos. - 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/es/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/es/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.) - [Calculadora de serie y paralelo](https://how.box/es/physics/series-parallel/): ¿Cómo se suman las resistencias y los condensadores? Combina de 2 a 12 resistencias o condensadores y ve el valor equivalente. - 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/es/physics/series-parallel/?k={k}&a={a}&p={p} (k: resistor or capacitor; a: series or parallel; p: array), e.g. https://how.box/es/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.) - [Área de figuras](https://how.box/es/math/shape-area/): ¿Cuánto mide el área de esta figura? Área y perímetro de rectángulos, círculos, triángulos y ocho figuras más, dibujados a escala. - 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/es/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/es/math/shape-area/?s=rectangle&a=4&b=3&c=2&n=6&t=1.5707963267948966&u=m&au=deg. Served answer coverage: main (primary answer only; inputs and secondary views update in the browser) - Runs entirely in the browser. Tags: calculator, geometry, area, metric, imperial. - Agent tools: `shape_area_calculate` (Area and perimeter of a plane shape (CRC Standard Mathematical Tables §4.5–4.6; triangle by Heron, ellipse perimeter by Ramanujan's approximation).) - [Volumen de cuerpos](https://how.box/es/math/shape-volume/): ¿Cuánto cabe en este cuerpo? Volumen y superficie de cajas, cilindros, esferas, conos y siete cuerpos más, también en litros y galones. - 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/es/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/es/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 [Volumen de una piscina](https://how.box/es/math/pool/): ¿Cuánta agua cabe en la piscina? The same tool, preconfigured. - [Conversor de tallas de calzado](https://how.box/es/conversion/shoe-size/): ¿A qué equivale tu talla de calzado? Compara tallas de referencia para adultos y niños. - 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/es/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/es/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.) - [Calculadora de ciclos de sueño](https://how.box/es/health/sleep/): ¿Cómo puedes planificar tu sueño? Calcula horas para acostarte o despertarte con ciclos aproximados de 90 minutos. - 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/es/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/es/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).) - [Conversor de velocidad](https://how.box/es/conversion/speed/): ¿A qué velocidad equivale en otras unidades? Convierte entre kilómetros por hora, millas por hora, metros por segundo, nudos y pies por minuto. - 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/es/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/es/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 [De km/h a mph](https://how.box/es/conversion/kmh-to-mph/): ¿Cuántas millas por hora son 100 km/h? The same tool, preconfigured. - [Dividir la cuenta](https://how.box/es/everyday/split-bill/): ¿Cuánto debe pagar cada persona? Reparte una cuenta en partes desiguales, hasta el último céntimo, con importes que siempre suman el total. - Addresses: en https://how.box/everyday/split-bill/, en-us https://how.box/en-us/everyday/split-bill/, fi https://how.box/fi/everyday/split-bill/, de https://how.box/de/everyday/split-bill/, es https://how.box/es/everyday/split-bill/, fr https://how.box/fr/everyday/split-bill/, sv https://how.box/sv/everyday/split-bill/, it https://how.box/it/everyday/split-bill/, et https://how.box/et/everyday/split-bill/ - Link to an answer: https://how.box/es/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/es/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.) - [Códigos de transpondedor](https://how.box/es/aviation/squawk/): ¿Qué significa el código 7700? Consulta cualquier código de transpondedor: los de emergencia 7500, 7600 y 7700, y los códigos VFR e IFR por país, con la norma que establece cada uno. - 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/es/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/es/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.) - [Comprobador de certificados SSL](https://how.box/es/web/ssl/): ¿Es válido y fiable tu certificado SSL? Caducidad, emisor, nombres cubiertos, cadena y versión TLS de cualquier sitio público, con soluciones fáciles de entender. - 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/es/web/ssl/?h={h}&p={p} (h: text; p: 443, 465, 636, 853, 993, 995 or 8443), e.g. https://how.box/es/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).) - [Atmósfera estándar (ISA)](https://how.box/es/aviation/standard-atmosphere/): ¿Cómo cambian la temperatura, la presión y la densidad con la altitud? La atmósfera estándar de la OACI a cualquier altitud o nivel de vuelo, en un día estándar, más cálido o más frío. - 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/es/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/es/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).) - [Calculadora de desviación estándar](https://how.box/es/math/standard-deviation/): ¿Cuánto se dispersan estos números? Desviación estándar y varianza muestral o poblacional de una lista de números, con la media y el error estándar. - 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/es/math/standard-deviation/?v={v}&k={k} (v: text; k: sample or population), e.g. https://how.box/es/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.) - [Cronómetro](https://how.box/es/datetime/stopwatch/): ¿Cuánto tiempo ha pasado? Iniciar, marcar vuelta, parar: cada tiempo parcial queda guardado. - 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/es/datetime/stopwatch/?f={f} (f: segments), e.g. https://how.box/es/datetime/stopwatch/?f=segments. Served answer coverage: none (computed in the browser) - Runs entirely in the browser. Tags: calculator, fitness. - Agent tools: none - [Calculadora de devolución del préstamo de estudios](https://how.box/es/finance/student-loan/): ¿Cuánto devolverás por tu préstamo de estudios? Consulta la cuota mensual y los intereses totales, con la compensación de Kela y el subsidio de intereses de Finlandia cuando se apliquen. - 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/es/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/es/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.) - [Salida y puesta del sol](https://how.box/es/datetime/sunrise/): ¿Cuándo sale y se pone el sol? Salida, puesta, mediodía solar, duración del día y crepúsculos de cualquier lugar y fecha, a partir de sus coordenadas. - 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/es/datetime/sunrise/?lat={lat}&lon={lon}&d={d}&z={z} (lat: text; lon: text; d: text; z: text), e.g. https://how.box/es/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).) - [Sintetizador](https://how.box/es/music/synth/): ¿Cómo sonaría tu melodía en un sintetizador? Toca y moldea un sintetizador: elige forma de onda, envolvente, filtro y LFO; después toca con ratón, pantalla táctil, teclado del ordenador o teclado MIDI. - Addresses: en https://how.box/music/synth/, en-us https://how.box/en-us/music/synth/, fi https://how.box/fi/music/synth/, de https://how.box/de/music/synth/, es https://how.box/es/music/synth/, fr https://how.box/fr/music/synth/, sv https://how.box/sv/music/synth/, it https://how.box/it/music/synth/, et https://how.box/et/music/synth/ - Link to an answer: https://how.box/es/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/es/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).) - [Calculadora de CO₂ del tubo de escape](https://how.box/es/vehicles/tailpipe-co2/): ¿Cuánto CO₂ emite tu coche? Gramos de CO₂ por kilómetro o milla, y kilos al año, según lo que consume tu coche de gasolina o diésel. - 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/es/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/es/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.) - [Conversor de temperatura](https://how.box/es/conversion/temperature/): ¿A qué temperatura equivale en otras escalas? Celsius, Fahrenheit, kelvin, Rankine y gas mark de hornos británicos, con exactitud. - 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/es/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/es/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 [De Celsius a Fahrenheit](https://how.box/es/conversion/celsius-to-fahrenheit/): ¿Cómo se convierte de Celsius a Fahrenheit? The same tool, preconfigured. - Preset [De Fahrenheit a Celsius](https://how.box/es/conversion/fahrenheit-to-celsius/): ¿Cómo se convierte de Fahrenheit a Celsius? The same tool, preconfigured. - [Comparador de textos](https://how.box/es/text/text-diff/): ¿En qué se diferencian estos textos? Ve lo añadido y lo eliminado, línea a línea o palabra a palabra. - 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/es/text/text-diff/?mode={mode}&case={case}&space={space} (mode: lines or words; case: boolean; space: boolean), e.g. https://how.box/es/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.) - [Calculadora de azulejos](https://how.box/es/everyday/tiles/): ¿Cuántos azulejos necesito? Azulejos y cajas, paquetes de suelo laminado o rollos de papel pintado para un suelo o una pared, con margen para cortes y mermas. - 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/es/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/es/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 [Calculadora de suelos](https://how.box/es/everyday/flooring/): ¿Cuánto suelo laminado necesito? The same tool, preconfigured. - Preset [Calculadora de papel pintado](https://how.box/es/everyday/wallpaper/): ¿Cuántos rollos de papel pintado necesito? The same tool, preconfigured. - [Temporizador de cuenta atrás](https://how.box/es/datetime/timer/): ¿Cuánto tiempo queda? Un poco de tiempo, contado con claridad. - 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/es/datetime/timer/?d={d}&f={f} (d: whole number 1000 to 3.59999e8; f: segments), e.g. https://how.box/es/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 [Temporizador para huevos](https://how.box/es/datetime/egg-timer/): ¿Cuánto tiempo hay que cocer un huevo? The same tool, preconfigured. - [Practicar las tablas de multiplicar](https://how.box/es/kids/times-tables/): ¿Qué tal te sabes las tablas de multiplicar? Elige tus tablas. Ve a tu ritmo, vuelve a intentarlo y descubre cuántas sabes. - 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/es/kids/times-tables/?n={n} (n: text), e.g. https://how.box/es/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 - [Conversor de husos horarios](https://how.box/es/datetime/timezone/): ¿Qué hora es allí cuando aquí es esta hora? Una hora convertida a varios husos horarios a la vez, con la fecha, el desfase y el horario de verano de ese día. - 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/es/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/es/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 [Diferencia horaria](https://how.box/es/datetime/time-difference/): ¿Cuántas horas de diferencia hay entre dos lugares? The same tool, preconfigured. - Preset [Lista de husos horarios](https://how.box/es/datetime/tz-list/): ¿Cuál es el desfase UTC de cada huso horario? The same tool, preconfigured. - [Calculadora de propinas](https://how.box/es/everyday/tip/): ¿Cuánto es la propina y cuánto paga cada persona? Añade una propina a la cuenta y reparte el total entre varias personas, al céntimo. - 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/es/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/es/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.) - [Propinas por país](https://how.box/es/everyday/tipping/): ¿Cuánta propina se deja en otro país? Costumbres de propina en restaurantes, taxis y hoteles por país, según las páginas oficiales de turismo, con la propina y el total de tu cuenta. - 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/es/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/es/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.) - [Generador de tonos](https://how.box/es/physics/tone/): ¿Cómo suena esta frecuencia? Reproduce un tono de prueba de 1 Hz a 20 kHz y consulta su nota, periodo y longitud de onda. - 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/es/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/es/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.) - [Conversor de par](https://how.box/es/conversion/torque/): ¿Cuánto par es eso en otras unidades? Convierte entre newton metros, libras-pie, libras-pulgada, kilogramos-fuerza metro y más. - 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/es/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/es/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 metros a libras-pie](https://how.box/es/conversion/nm-to-ft-lb/): ¿Cuántas libras-pie tiene un newton metro? The same tool, preconfigured. - [Piano de juguete](https://how.box/es/kids/toy-piano/): ¿Te apetece tocar una canción en el piano de juguete? Teclas grandes de colores con sonidos de piano de juguete, xilófono y marimba, y canciones que iluminan la siguiente tecla. - 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/es/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/es/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.) - [Calculadora del impuesto de transmisiones](https://how.box/es/finance/transfer-tax/): ¿Cuánto impuesto de transmisiones pagas por una vivienda en Finlandia? El impuesto de transmisiones finlandés sobre un piso, un inmueble o acciones, con los tipos vigentes en la fecha de tu contrato. - 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/es/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/es/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 (Finlandia). - Agent tools: `transfer_tax_calculate` (Finland only: the transfer tax (varainsiirtovero) one buyer pays, by Varainsiirtoverolaki 931/1996 and the contract date.) - [Calculadora de triángulos](https://how.box/es/math/triangle/): ¿Cómo resuelvo un triángulo? Da tres elementos de un triángulo y obtén los otros tres, su área y un dibujo a escala, también cuando hay dos soluciones. - 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/es/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/es/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).) - [Afinador](https://how.box/es/music/tuner/): ¿Está afinado tu instrumento? Toca una nota cerca del micrófono para ver la nota más cercana, los cents por encima o debajo y la frecuencia. El sonido permanece en tu dispositivo. - 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/es/music/tuner/?i={i}&a={a} (i: chromatic, guitar, bass, ukulele or violin; a: number 400 to 480), e.g. https://how.box/es/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).) - [Prueba de mecanografía](https://how.box/es/text/typing-test/): ¿A qué velocidad escribes? Tu velocidad en palabras por minuto, con la precisión y las teclas en las que más fallas. - 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/es/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/es/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.) - [Comparador de precio por unidad](https://how.box/es/finance/unit-price/): ¿Cómo encuentras el envase más barato por kilo o litro? Compara envases de distinto tamaño por su precio por kilogramo, litro o unidad. - 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/es/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/es/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.) - [Conversor de marcas de tiempo Unix](https://how.box/es/datetime/unix-time/): ¿Cómo conviertes una marca de tiempo Unix en fecha? Convierte marcas de tiempo Unix a fechas y fechas a marcas de tiempo, en cualquier huso horario. - 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/es/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/es/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.) - [Codificar y decodificar URL](https://how.box/es/web/url-encode/): ¿Cómo se codifica texto para una dirección web? Codifica texto con porcentajes para una dirección web o convierte %20 y otros códigos en texto normal. - 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/es/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/es/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).) - [Generador de UUID](https://how.box/es/web/uuid/): ¿Cómo se crea un UUID nuevo? UUID aleatorios de versión 4 o de versión 7 ordenados por tiempo, creados en tu dispositivo. - 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/es/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/es/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).) - [Calculadora de IVA](https://how.box/es/finance/vat/): ¿Cuánto IVA incluye un precio? Añade o quita el IVA de un precio con los tipos general y reducidos de tu país. - 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/es/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/es/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 [Calculadora de IVA de Reino Unido](https://how.box/es/finance/uk-vat/): ¿Cuánto IVA lleva un precio en Reino Unido? The same tool, preconfigured. - Preset [Calculadora de IVA de Austria](https://how.box/es/finance/austria-vat/): ¿Cuánto IVA lleva un precio en Austria? The same tool, preconfigured. - Preset [Calculadora de IVA de Suiza](https://how.box/es/finance/swiss-vat/): ¿Cuánto IVA lleva un precio en Suiza? The same tool, preconfigured. - [Conversor de volumen](https://how.box/es/conversion/volume/): ¿Cuánto es en otras unidades de volumen? Convierte entre mililitros, litros, metros cúbicos, galones estadounidenses y galones imperiales con exactitud. - 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/es/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/es/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 [De litros a galones estadounidenses](https://how.box/es/conversion/litres-to-gallons/): ¿Cuántos galones estadounidenses son un litro? The same tool, preconfigured. - [Calculadora del índice cintura-estatura](https://how.box/es/health/waist-height/): ¿Mide tu cintura menos de la mitad de tu estatura? Tu índice cintura-estatura y lo que dice de la grasa abdominal, con las categorías de NICE y la regla de la mitad de la estatura. - 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/es/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/es/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).) - [Prueba de cámara web](https://how.box/es/media/webcam-test/): ¿Funciona mi cámara web? Pulsa Iniciar para ver tu cámara en directo, con el tamaño de imagen y los fotogramas por segundo. - 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/es/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/es/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.) - [Número de semana](https://how.box/es/datetime/week-number/): ¿En qué semana estamos? Número de semana ISO de hoy o de cualquier fecha, y fechas de cualquier semana. - 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/es/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/es/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.) - [Conversor de peso](https://how.box/es/conversion/weight/): ¿Cuánto pesa en otras unidades? Convierte entre kilogramos, gramos, libras, onzas, stones, toneladas, quilates y más, con exactitud. - 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/es/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/es/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 [De kilogramos a libras](https://how.box/es/conversion/kg-to-lb/): ¿Cuántas libras son un kilogramo? The same tool, preconfigured. - Preset [De libras a kilogramos](https://how.box/es/conversion/lb-to-kg/): ¿Cuántos kilogramos son una libra? The same tool, preconfigured. - [¿Cuál es mi IP?](https://how.box/es/web/what-is-my-ip/): ¿Cómo ve internet tu conexión? Tu IP pública y la red que hay detrás. - 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/es/web/what-is-my-ip/?view={view} (view: ip, ipv6, isp or location), e.g. https://how.box/es/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 [¿Tengo IPv6?](https://how.box/es/web/do-i-have-ipv6/): ¿Esta conexión usa IPv6? The same tool, preconfigured. - Preset [Mi proveedor de internet](https://how.box/es/web/my-isp/): ¿Qué red transporta tu conexión? The same tool, preconfigured. - Preset [Ubicación IP](https://how.box/es/web/ip-location/): ¿Dónde parece estar tu IP? The same tool, preconfigured. - [Consulta WHOIS](https://how.box/es/web/whois/): ¿Cómo está registrado este dominio? Consulta el registrador, las fechas y los servidores de nombres que comunica 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/es/web/whois/?d={d} (d: text), e.g. https://how.box/es/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.) - [Tarjeta Wi-Fi](https://how.box/es/printables/wifi-card/): ¿Cómo comparto mi Wi-Fi con las visitas? Una tarjeta imprimible con un código QR para conectarse a tu Wi-Fi al escanearlo con la cámara del teléfono. - 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/es/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/es/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.) - [Enfriamiento por viento e índice de calor](https://how.box/es/earth/wind-chill/): ¿Cuánto frío o calor hace de verdad fuera? La sensación térmica: enfriamiento por viento con frío, índice de calor con calor. - 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/es/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/es/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.) - [Escala de Beaufort](https://how.box/es/conversion/wind-scale/): ¿Con qué fuerza sopla el viento en la escala de Beaufort? Pasa una velocidad del viento en m/s, km/h, nudos o mph a su fuerza y nombre en la escala de Beaufort. - 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/es/conversion/wind-scale/?s={s}&u={u} (s: number 0 to 1000; u: ms, kmh, kt or mph), e.g. https://how.box/es/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).) - [Triángulo de viento](https://how.box/es/aviation/wind-triangle/): ¿Qué rumbo y velocidad respecto al suelo necesito con este viento? Rumbo, corrección de deriva y velocidad respecto al suelo para una ruta y un viento, con tiempo de tramo, combustible y un triángulo dibujado. - 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/es/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/es/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.) - [Conversor de calibre de cable](https://how.box/es/conversion/wire-gauge/): ¿Cuántos mm² tiene ese cable AWG? Convierte AWG a mm², kcmil y diámetro, con la resistencia del cobre por kilómetro. - 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/es/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/es/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).) - [Contador de palabras](https://how.box/es/text/word-count/): ¿Cuánto ocupa tu texto? Palabras, caracteres y tiempo de lectura mientras escribes. - 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/es/text/word-count/? (), e.g. https://how.box/es/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.) - [Días laborables en Finlandia](https://how.box/es/datetime/working-days/): ¿Cuántos días laborables hay en Finlandia entre dos fechas? Cuenta los días laborables de Finlandia entre dos fechas o añádelos a una fecha. - 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/es/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/es/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 (Finlandia). - 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).) - [Reloj mundial](https://how.box/es/datetime/world-clock/): ¿Qué hora es en Nueva York, Londres y Tokio? Relojes en directo de las ciudades que elijas, con fecha, desfase, diferencia con tu hora e indicación de día o noche. - 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/es/datetime/world-clock/?z={z}&at={at} (z: text; at: text), e.g. https://how.box/es/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.) - [Calculadora de puntuación z](https://how.box/es/math/z-score/): ¿Cómo de inusual es este valor? La puntuación z y el percentil de un valor en una distribución normal, el valor en un percentil o la probabilidad entre dos valores. - 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/es/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/es/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).) - [Hora zulú](https://how.box/es/datetime/zulu-time/): ¿Qué hora es en zulú (UTC)? La hora zulú actual y la conversión de cualquier hora zulú a local y viceversa, con el grupo de día y hora que usan los pilotos. - 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/es/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/es/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/es/about/accessibility/ - https://how.box/es/about/privacy/ - https://how.box/es/about/terms/ - https://how.box/es/about/agents/ ## Optional - [Full text](https://how.box/es/llms-full.txt): every tool's explanation and FAQ