Unit conversion
Convert lengths, temperatures and other units exactly, using the official definitions, with every common unit side by side.
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Utilities
- Altimeter settingsAltitude on QNH, flight level and QFE side by side, with hPa ↔ inHg ↔ mmHg, the transition level, cruising levels and the cold-temperature correction., private, runs on your deviceAviationCalculatorFlyingConverterTemperature
- Angle converterConvert between degrees, radians, gradians, arcminutes, arcseconds, turns and mils., private, runs on your deviceConverterGeometry
- Area converterConvert between square metres, hectares, acres, square feet, square miles and more, exactly., private, runs on your deviceConverterAreaMetricImperial
- Beaufort wind scaleTurn a wind speed in m/s, km/h, knots or mph into its Beaufort force and name., private, runs on your deviceConverterWeatherSpeed
- Blood sugar converterConvert blood glucose between mmol/L and mg/dL, and HbA1c between mmol/mol and %, with the estimated average glucose., private, runs on your deviceHealth & fitnessConverterCalculator
- Cooking converterConvert recipe amounts by ingredient., private, runs on your deviceConverter
- CSS unit converterConvert CSS lengths between px, rem, em, pt, pc, in, cm, mm and Q at your font size., private, runs on your deviceConverterLength
- Data size converterConvert between bytes, kilobytes, megabytes, gigabytes, MiB, GiB and bits, with 1,000 and 1,024 kept apart., private, runs on your deviceConverterEncoding
- Density converterConvert between kg/m³, g/cm³, kg/L, g/L, lb/ft³, lb/in³, oz/in³ and pounds per gallon., private, runs on your deviceConverterWeightVolume & capacityMetricImperial
- Energy converterConvert between joules, kilowatt-hours, kilocalories, BTU and more, using exact definitions., private, runs on your deviceConverterEnergyMetric
- Force converterConvert between newtons, kilonewtons, kilogram-force, pound-force, kips, dynes and poundals., private, runs on your deviceConverterMetricImperial
- Fuel economy converterConvert between L/100 km, km/L, miles per gallon (US and imperial) and electric kWh/100 km, mi/kWh., private, runs on your deviceConverterMetricImperialEnergy
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- Length ConverterConvert between metric and imperial lengths, exactly., private, runs on your deviceConverterLengthDistanceMetricImperial
- Paper sizesLook up A, B and C series sizes and US Letter, Legal and Tabloid in millimetres, centimetres, inches or points., private, runs on your deviceReferenceLengthMetricImperial
- Power converterConvert between watts, kilowatts, megawatts, horsepower, metric horsepower and BTU per hour, exactly., private, runs on your deviceConverterEnergyMetric
- Pressure converterConvert between pascals, hectopascals, kilopascals, bar, psi, atmospheres, mmHg and inHg., private, runs on your deviceConverterMetricImperial
- Roman numeral converterTurn a number into Roman numerals, or Roman numerals into a number, in the standard form from 1 to 3999., private, runs on your deviceConverterCalculator
- Shoe size converterCompare reference sizes for adults and children., private, runs on your deviceConverterReference
- Speed converterConvert between kilometres per hour, miles per hour, metres per second, knots and feet per minute., private, runs on your deviceConverterSpeedMetricImperial
- Temperature ConverterCelsius, Fahrenheit, kelvin, Rankine and oven gas marks, exactly., private, runs on your deviceConverterTemperatureMetricImperial
- Torque converterConvert between newton metres, foot-pounds, inch-pounds, kilogram-force metres and more., private, runs on your deviceConverterMetricImperial
- Volume converterConvert between millilitres, litres, cubic metres, US gallons and imperial gallons, exactly., private, runs on your deviceConverterVolume & capacityMetricImperial
- Weight converterConvert between kilograms, grams, pounds, ounces, stone, tons, carats and more, exactly., private, runs on your deviceConverterWeightMetricImperial
- Wire gauge converterConvert AWG to mm², kcmil and diameter, with the copper resistance per kilometre., private, runs on your deviceConverter
Conversions use exact definitions, such as 1 inch = 2.54 cm, so the results are exact rather than rounded tables. Each converter shows all its units at once and explains the formula.
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