Length
Convert lengths between millimetres, centimetres, metres, kilometres, inches, feet, yards and miles. Whether you are building, travelling or following a foreign recipe — the right measurement is always at hand.
Frequently asked questions
1 inch is exactly 2.54 centimetres. This is the internationally agreed definition of the inch, established in 1959 by an agreement between English-speaking countries.
1 mile (statute mile) is 1,609.34 metres, or 1.60934 kilometres. The mile was originally defined as 1,000 double paces (mille passuum) from Roman times.
1 metre equals 3.281 feet. Conversely, 1 foot is 30.48 centimetres. Feet are still used in the US and UK for body height and building measurements.
A nautical mile is 1,852 metres, while a land (statute) mile is 1,609.34 metres. Nautical miles are based on one arc-minute of the Earth's circumference and are used in maritime and aviation contexts.