Unit Converter
Convert length, weight, temperature, volume, area, speed and more between metric and imperial units.
Convert between common units of length, mass, temperature, volume, area, speed and time. Metric and imperial units are both supported.
How it works
Pick a category, enter a value and choose the units to convert from and to. Conversions use exact definitions (for example 1 inch = 25.4 mm and 1 pound = 0.45359237 kg). Temperature uses the standard Celsius, Fahrenheit and Kelvin formulas.
Examples
- 10 km = 6.2137 miles
- 70 kg = 154.32 lb
- 20 °C = 68 °F
Frequently asked questions
How accurate are the conversions?
They use the internationally agreed exact definitions of each unit, so results are limited only by floating-point precision.
Does it support US and UK gallons?
Yes. US and imperial (UK) gallons are listed separately because they are different sizes.
Why is temperature conversion different?
Celsius, Fahrenheit and Kelvin have different zero points, so they use formulas rather than a single multiplier.
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