Length
Convert lengths between millimeters, centimeters, meters, kilometers, inches, feet, yards and miles. Whether you are building, traveling or following a foreign recipe — the right measurement is always at hand.
Frequently asked questions
1 inch is exactly 2.54 centimeters. 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 meters, or 1.60934 kilometers. The mile was originally defined as 1,000 double paces (mille passuum) from Roman times.
1 meter equals 3.281 feet. Conversely, 1 foot is 30.48 centimeters. Feet are the standard unit for height and building measurements in the United States.
A nautical mile is 1,852 meters, while a land (statute) mile is 1,609.34 meters. Nautical miles are based on one arc-minute of the Earth's circumference and are used by the US Navy and civil aviation.