Unit converter

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Some handy equivalences to keep in mind: 1 inch is 2.54 cm; 1 foot, 30.48 cm; 1 mile, 1.609 km; 1 pound, 0.454 kg; and 1 US gallon, 3.785 litres. For temperature, to go from Celsius to Fahrenheit you multiply by 9/5 and add 32.

The converter works with exact factors relative to the base unit of each quantity (metre, kilogram, litre or m/s), so you can chain any pair of units in the same category without losing precision.