# Calcora

> Exact unit conversions, daily exchange rates, world time and everyday calculators in 8 languages. Instant answers with formulas and sources.

Calcora publishes 730 unit-conversion pages across 12 categories, 564 currency pairs (ECB reference rates, refreshed every business day), 78 world-clock city pages and 8 calculators, each in 8 languages (en, ja, es, pt, de, fr, it, id). Every page leads with the direct answer (e.g. "1 inch = 2.54 centimeters"), then the exact formula, a conversion table and sources. Conversion factors follow NIST SP 811 and the BIPM SI Brochure.

## Unit converters
- [Length converter](https://calcora.dev/length/): mm, cm, m, km, µm, in, ft, yd, mi, nmi
- [Weight converter](https://calcora.dev/mass/): mg, g, kg, t, oz, lb, st, sh tn, LT, ct
- [Temperature converter](https://calcora.dev/temperature/): °C, °F, K
- [Volume converter](https://calcora.dev/volume/): mL, L, m³, tsp, tbsp, fl oz, cup, pt, qt, gal, imp gal, ft³, in³
- [Area converter](https://calcora.dev/area/): cm², m², km², ha, ac, in², ft², yd², mi²
- [Speed converter](https://calcora.dev/speed/): m/s, km/h, mph, kn, ft/s
- [Time converter](https://calcora.dev/duration/): ms, s, min, h, d, wk, mo, yr
- [Data Storage converter](https://calcora.dev/data/): bit, B, kB, MB, GB, TB, PB, KiB, MiB, GiB, TiB
- [Energy converter](https://calcora.dev/energy/): J, kJ, cal, kcal, Wh, kWh, BTU, eV
- [Pressure converter](https://calcora.dev/pressure/): Pa, hPa, kPa, bar, psi, atm, mmHg
- [Power converter](https://calcora.dev/power/): W, kW, hp, PS, BTU/h
- [Fuel Economy converter](https://calcora.dev/fuel/): km/L, L/100 km, mpg US, mpg UK

## Most used conversions
- [Centimeters to Inches](https://calcora.dev/length/centimeters-to-inches/): 1 cm = 0.3937008 in
- [Inches to Centimeters](https://calcora.dev/length/inches-to-centimeters/): 1 in = 2.54 cm
- [Kilograms to Pounds](https://calcora.dev/mass/kilograms-to-pounds/): 1 kg = 2.204623 lb
- [Pounds to Kilograms](https://calcora.dev/mass/pounds-to-kilograms/): 1 lb = 0.4535924 kg
- [Degrees Celsius to Degrees Fahrenheit](https://calcora.dev/temperature/celsius-to-fahrenheit/): 1 °C = 33.8 °F
- [Degrees Fahrenheit to Degrees Celsius](https://calcora.dev/temperature/fahrenheit-to-celsius/): 1 °F = -17.22222 °C
- [Feet to Meters](https://calcora.dev/length/feet-to-meters/): 1 ft = 0.3048 m
- [Meters to Feet](https://calcora.dev/length/meters-to-feet/): 1 m = 3.28084 ft
- [Kilometers to Miles](https://calcora.dev/length/kilometers-to-miles/): 1 km = 0.6213712 mi
- [Miles to Kilometers](https://calcora.dev/length/miles-to-kilometers/): 1 mi = 1.609344 km
- [Feet to Centimeters](https://calcora.dev/length/feet-to-centimeters/): 1 ft = 30.48 cm
- [Centimeters to Feet](https://calcora.dev/length/centimeters-to-feet/): 1 cm = 0.0328084 ft
- [Liters to US Gallons](https://calcora.dev/volume/liters-to-gallons/): 1 L = 0.2641721 gal
- [Milliliters to US Fluid Ounces](https://calcora.dev/volume/milliliters-to-fluid-ounces/): 1 mL = 0.03381402 fl oz
- [Ounces to Grams](https://calcora.dev/mass/ounces-to-grams/): 1 oz = 28.34952 g
- [Grams to Ounces](https://calcora.dev/mass/grams-to-ounces/): 1 g = 0.03527396 oz
- [Kilometers per Hour to Miles per Hour](https://calcora.dev/speed/km-per-hour-to-mph/): 1 km/h = 0.6213712 mph
- [Miles per Hour to Kilometers per Hour](https://calcora.dev/speed/mph-to-km-per-hour/): 1 mph = 1.609344 km/h
- [Square Meters to Square Feet](https://calcora.dev/area/square-meters-to-square-feet/): 1 m² = 10.76391 ft²
- [Acres to Hectares](https://calcora.dev/area/acres-to-hectares/): 1 ac = 0.4046856 ha
- [Megabytes to Gigabytes](https://calcora.dev/data/megabytes-to-gigabytes/): 1 MB = 0.001 GB
- [US Cups to Milliliters](https://calcora.dev/volume/cups-to-milliliters/): 1 cup = 236.5882 mL
- [Kilocalories to Kilojoules](https://calcora.dev/energy/kilocalories-to-kilojoules/): 1 kcal = 4.184 kJ
- [Miles per Gallon (US) to Liters per 100 Km](https://calcora.dev/fuel/mpg-us-to-liters-per-100km/): 1 mpg US = 235.2146 L/100 km

## Exchange rates
- [Currency converter](https://calcora.dev/currency/): ECB reference rates for 30 currencies, as of 2026-11-02
- [USD to EUR](https://calcora.dev/currency/usd-to-eur/): 1 USD = 0.891583 EUR (2026-11-02)
- [EUR to USD](https://calcora.dev/currency/eur-to-usd/): 1 EUR = 1.1216 USD (2026-11-02)
- [USD to JPY](https://calcora.dev/currency/usd-to-jpy/): 1 USD = 157.899 JPY (2026-11-02)
- [GBP to USD](https://calcora.dev/currency/gbp-to-usd/): 1 GBP = 1.34195 USD (2026-11-02)
- [USD to INR](https://calcora.dev/currency/usd-to-inr/): 1 USD = 94.9095 INR (2026-11-02)

## World clock
- [World clock](https://calcora.dev/time/): 78 cities with live time, UTC offset, DST and sun times
- [Time zone converter](https://calcora.dev/time/converter/)

## Calculators
- [Percentage calculator](https://calcora.dev/calculators/percentage/): X% of Y, percent change
- [BMI calculator](https://calcora.dev/calculators/bmi/): Body mass index
- [Age calculator](https://calcora.dev/calculators/age/): Exact age from date of birth
- [Days between dates](https://calcora.dev/calculators/date-difference/): Days, weeks & workdays
- [Loan calculator](https://calcora.dev/calculators/loan/): Monthly payment & interest
- [Compound interest calculator](https://calcora.dev/calculators/compound-interest/): Savings growth over time
- [Tip calculator](https://calcora.dev/calculators/tip/): Tip & bill splitting
- [Discount calculator](https://calcora.dev/calculators/discount/): Sale price & savings

## Data
- [Open data API](https://calcora.dev/api/): static JSON for units, rates and time zones
- [Full fact sheet](https://calcora.dev/llms-full.txt): every conversion factor in plain text

## Languages
- [English](https://calcora.dev/)
- [日本語](https://calcora.dev/ja/)
- [Español](https://calcora.dev/es/)
- [Português](https://calcora.dev/pt/)
- [Deutsch](https://calcora.dev/de/)
- [Français](https://calcora.dev/fr/)
- [Italiano](https://calcora.dev/it/)
- [Bahasa Indonesia](https://calcora.dev/id/)