Conversion Calculators

Convert nearly any unit of measurement using our free conversion calculators.

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What Is Unit Conversion?

Unit conversion is the process of converting a measure of physical quantity from one unit to another, for instance, converting your height from inches to centimeters.

The process for converting between units is to multiply or divide by a conversion factor to convert from one unit of measure to the target unit.[1]

Sounds complicated? It may seem complex, but in practice, it's simpler than it sounds once you know the conversion factor between units.

Each one of our conversion calculators provides the formula to convert from one unit to another with the conversion factor, along with an explanation of the formula and examples demonstrating how to use them.

In addition, our converters offer fast and precise conversions. Start exploring them by selecting a measurement quantity above.


  1. Kenneth Butcher, Linda Crown, and Elizabeth J. Gentry, The International System of Units (SI) - Conversion Factors for General Use, National Institute of Standards and Technology,