km to miles


Most popular length unit conversions

Most popular length unit conversions

Convert km to miles


Definition: Kilometers (symbol: km) are units of length in the International System of Units. A kilometer is equivalent to 0.6214 miles.

History/origin – Kilo- is a prefix in a metric that indicates one thousand. A kilometer is equal to one thousand meters. The origin of a kilometer is closely associated with the origin of a meter. Currently, it is defined as the distance traveled by light in 1/299792 458 seconds. Even though the definition of meter can be changed, the relationship between meter and kilometer will remain unchanged.

Current usage:  Most countries use the mile as the standard measurement unit for expressing distances between geographical points on the ground. The United States (USA) and the United Kingdom (UK) are two countries that prefer the mile over the kilometer. However, the United Kingdom adopted the metric system, unlike the United States. In spite of the widespread use of the metric system in government, commerce, and industry, the United Kingdom still uses miles on its roads as a remnant of the imperial system.


Definition: A mile is a unit of length in both US customary and imperial measurement systems. In terms of measurement, it can be defined as 5,280 feet, 1,760 yards, or 1,609.344 meters.

History/origin:  A mile is an English unit of length (predecessor to Imperial units and Customary Units of the United States). Prior to the widespread adoption and use of the metric system, the mile was commonly referred to as “m.” “Mi,” however, has become the preferred abbreviation in order to avoid confusion between meters and miles. Miles are 5,280 feet long (8 furlongs), unlike Roman miles (5,000 feet) which are 4,000 feet. Due to the furlong’s importance in England in 1593, this occurred. Many other units are also derived from or closely related to the Roman mile. These include the nautical mile (1,852 kilometers exactly), the Italian mile (1,852 kilometers), and the Chinese mile (505 meters exactly)