Unit Converter
Pick a dimension, then convert. Temperature uses offset formulas. Fuel economy uses the mpg and L/100 km relation.
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How to convert units
- Choose a dimension so From and To list matching units.
- Enter a value and pick the two units.
- Read the converted value. Factors are fixed; they are not live FX rates.
- High-volume pairs such as inches to cm also have their own pages.
Unit conversion
Multiply by an exact factor, or temperature offset
| Length inch | 1 in = 0.0254 m exactly |
|---|---|
| Mass pound | 1 lb = 0.45359237 kg exactly |
| Temperature | K = C + 273.15; F = C × 9/5 + 32 |
| Currency | Not on this page |
One converter, many dimensions
Pick a dimension, a from unit, and a to unit. Length, mass, volume, area, speed, data, energy, power, pressure, angle, time, cooking volume, and fuel economy are SI-factor conversions except temperature and fuel. Temperature uses Kelvin as the middle unit. Fuel economy converts US mpg and L/100 km.
Which factors are exact
The inch is exact 0.0254 m. The avoirdupois pound is exact 0.45359237 kg. The US gallon is exact 231 cubic inches. Data SI prefixes are 1000; kibi prefixes are 1024. Cooking volumes on this hub are US customary.
Dedicated pair pages
High-intent pairs also have their own URLs, such as inches to cm and kg to lb. Those pages use the same engine. This hub is the general converter and does not occupy /converters/units/ itself.