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One value. Every unit.

Choose a converter, enter a value, then select your source and target units. Results update as you type. Use the swap button to reverse the direction.

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LENGTH

Feet, inches & fractions

Enter measurements such as 5 ft 11 in in the Length Converter. When converting to feet or inches, choose fractional precision for a result rounded to the nearest 1/16 inch.

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TEMPERATURE

Reading or difference?

A temperature reading and a change in temperature use different formulas. Choose Temperature difference for a rise or drop: a change of 10 °C equals a change of 18 °F.

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DEFINITIONS

Know the source

Unit conversions use defined factors. For official measurement definitions and conversion tables, see the US National Institute of Standards and Technology.

NIST Guide to the SI ↗

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