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Unit converter

Convert length, weight and temperature between metric and imperial units, live as you type.

Convert units

Pick a category, then the from and to units.

Category
Result
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Enter a value to convert.

Exact definitions: the mile is exactly 1,609.344 meters and the pound exactly 0.45359237 kilograms, so these conversions are precise, not approximate.
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Handy conversions to remember

  • 1 km = 0.621371 miles; 1 mile = 1.609344 km.
  • 1 kg = 2.20462 pounds; 1 pound = 0.453592 kg.
  • 1 inch = 2.54 cm exactly; 1 foot = 30.48 cm.
  • C to F: multiply by 9/5 and add 32. F to C: subtract 32, multiply by 5/9.
  • Kelvin = Celsius + 273.15.

Why temperature is special

Length and weight convert with a single multiplication because they share a zero point. Temperature scales start at different zeros, so conversion needs both a multiplication and an offset. That is why 0 C is 32 F, not 0 F.

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Unit converter FAQs

How many miles is a kilometer?
One kilometer is 0.621371 miles. To convert, multiply kilometers by 0.621371; to go the other way, multiply miles by 1.609344.
How many pounds is a kilogram?
One kilogram is 2.20462 pounds. Multiply kilograms by 2.20462 for pounds, or divide pounds by 2.20462 for kilograms.
How do you convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 and add 32. For example, 20 C is 68 F. To go back, subtract 32 and multiply by 5/9.
Is the conversion exact?
Yes for the defined units: the mile is defined as exactly 1,609.344 meters and the pound as exactly 0.45359237 kilograms. Results are rounded for display but computed at full precision.
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