Unit Conversion Calculator
Convert length, weight, volume, area, speed and temperature units instantly, from metric to US customary and back.
How unit conversion works
Choose a value, the unit you have and the unit you want. Each unit is converted through a common base (meters, kilograms, liters, square meters, meters per second or Celsius), so any two units of the same type work. Temperature uses formulas instead of a single factor, such as °F = °C × 9/5 + 32.
Frequently asked questions
Which units are supported?
Length (mm to miles), weight (mg to metric tons and stone), volume (mL to US gallons), area (sq ft, sq m, acres, hectares), speed (m/s, km/h, mph) and temperature (°C, °F, K).
Why does it ask for the same type of unit?
You can only convert between units that measure the same thing, such as kilograms to pounds. Converting kilograms to meters has no meaning.
Are the volume units US or UK?
US customary. A US cup is about 236.6 mL and a US gallon is 3.785 liters. UK (imperial) pints and gallons are larger.
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