Length converter

How to use

Length conversion moves a measurement between metric and imperial units that were fixed by convention, so every factor here is exact: the inch was defined as exactly 25.4 millimetres. That is why a conversion between these units does not lose precision, whatever direction it runs.

• Convert a measurement from a foreign plan or manual.
• Check a screen, furniture or tyre size quoted in inches.
• Turn kilometres into miles for a route or a race.

1. Enter the measurement and the unit it is written in.
2. Choose the unit you want.
3. The result is the same length expressed in the other unit.

Formula

1 in = 25.4 mm · 1 ft = 0.3048 m · 1 yd = 0.9144 m · 1 mi = 1.609344 km

Example

1.80 m is 5.91 ft, or 70.87 in. 100 km is 62.14 mi.

Limitations

• All factors are exact, but the result is rounded for display — very long distances may differ in the last decimal.
• Imperial units used in trade (such as the Brazilian légua or the US survey foot) are not included.

Frequently asked questions