Unit Converter
Instantly convert between units of length, weight, temperature, speed, and time. Free online calculators with detailed formulas and conversion tables.
Convert between metres, kilometres, miles, feet, inches, yards, and more.
All Length conversions →Convert between kilograms, pounds, ounces, grams, tonnes, and stones.
All Weight conversions →Convert between Celsius, Fahrenheit, and Kelvin with precise formulas.
All Temperature conversions →Convert between km/h, mph, m/s, knots, and feet per second.
All Speed conversions →Convert between seconds, minutes, hours, days, weeks, months, and years.
All Time conversions →Convert between square metres, hectares, acres, square feet, and square miles.
All Area conversions →Convert between litres, millilitres, gallons, cups, fluid ounces, and more.
All Volume conversions →Convert between pascal, bar, atmosphere, psi, and mmHg.
All Pressure conversions →Convert between joules, calories, kilocalories, kWh, and BTU.
All Energy conversions →Convert between watts, kilowatts, megawatts, horsepower, and BTU/h.
All Power conversions →Convert between hertz, kilohertz, megahertz, gigahertz, and RPM.
All Frequency conversions →Convert between degrees, radians, gradians, arcminutes, and arcseconds.
All Angle conversions →Convert between newtons, kilonewtons, pound-force, kilogram-force, and dynes.
All Force conversions →How Unit Conversion Works
Unit conversion is the process of expressing a measurement in a different unit while maintaining the same quantity. Most conversions use a simple multiplication or division by a conversion factor. For example, to convert kilometres to miles, multiply by 0.621371. Temperature conversion is unique because it requires both multiplication and addition due to different zero points on the Celsius and Fahrenheit scales.
Our converter supports five major categories: length (metres, feet, miles, inches), weight (kilograms, pounds, ounces), temperature (Celsius, Fahrenheit, Kelvin), speed (km/h, mph, knots), and time (seconds, hours, days, years). Each conversion includes a formula, reference table, and detailed explanation.