Kilometers to Miles Converter

Convert kilometers to miles instantly.

Common length units

Kilometer (km)

Definition: A kilometer (symbol: km) is equal to 1,000 meters. It is a unit of length in the SI system derived from the base unit meter using the prefix kilo-, which denotes a factor of 1,000.

History/origin: The kilometer emerged alongside the metric system in France in the late 18th century. As trade and travel expanded, a larger practical unit of distance was needed beyond the meter, making the kilometer a natural and convenient choice.

Current use: Kilometers are widely used to express distances between geographic locations in most countries that use the metric system. Road signs, maps, and navigation systems in Europe, Asia, Africa, and most of the Americas display distances in kilometers.

Mile (mi)

Definition: The mile is a long customary distance unit. One mi is fixed at 5,280 ft, which equals exactly 1.609344 km.

History/origin: The mile began as a pace-based Roman measure, changed through English surveying and legal standards, and was ultimately locked to the modern yard and foot.

Current use: Mi is used on US and UK roads, vehicle odometers, race distances, aviation or nautical-adjacent contexts, fitness apps, and regional distance descriptions.