Miles to Kilometers Converter

Convert miles to kilometers instantly.

Common length units

Mile (mi)

Definition: A mile (symbol: mi) is a unit of length equal to exactly 1,609.344 meters or 5,280 feet. It is used in the imperial and US customary measurement systems.

History/origin: The mile originates from the Roman mille passuum (a thousand paces), which was approximately 1,480 meters. Over time the English mile evolved to its current standardized length, fixed at 1,609.344 m in 1959 alongside the international yard and foot agreement.

Current use: Miles are used for road distances in the United States, United Kingdom, and a handful of other countries. Speed limits, odometers, and road signs in these regions display distances in miles rather than kilometers.

Kilometer (km)

Definition: The kilometer is a metric distance unit for longer lengths. One km contains exactly 1,000 m, using the kilo- prefix for one thousand.

History/origin: Once the metric system was used for roads, maps, and travel, kilometers provided a manageable way to express distances that would be unwieldy in meters.

Current use: Km is standard on road signs, running routes, cycling apps, maps, navigation systems, rail distances, geography lessons, and trip planning across metric regions.