Length Converter
Convert between mm, cm, m, km, inches, feet, yards, and miles instantly.
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About this length converter
This tool converts between 8 common length units. Pick any two units, enter a value, and the result updates instantly — every conversion happens with simple arithmetic directly in your browser, so there's no network request, no waiting, and it keeps working even if you lose your internet connection.
Units covered
- Millimeter (mm) — one thousandth of a meter, commonly used for precision measurements like paper thickness or small mechanical parts.
- Centimeter (cm) — one hundredth of a meter, and the everyday unit most of the world uses for height, small objects, and fabric.
- Meter (m) — the SI base unit of length, originally defined as one ten-millionth of the distance from the equator to the North Pole.
- Kilometer (km) — one thousand meters, the standard unit for road distances and geography almost everywhere outside the US.
- Inch (in) — defined as exactly 2.54 centimeters, still the standard for screen sizes, tools, and paper sizes in the US.
- Foot (ft) — equal to 12 inches, used for height, room dimensions, and altitude in aviation worldwide.
- Yard (yd) — equal to 3 feet, most familiar from American football fields and fabric measurements.
- Mile (mi) — the standard unit for road distances in the US and UK, equal to 5,280 feet.