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kilometer (km) → mile (mi)

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Use our free online converter to convert between units instantly. Enter any value in the field above to get accurate results. No signup or download required—all conversions run in your browser. Our calculator uses standard conversion factors for reliability.

0
km=mi
0.01=0.006214
0.1=0.062137
1=0.621371
2=1.242742
3=1.864114
5=3.106856
10=6.213712
20=12.427424
50=31.06856
100=62.137119
1000=621.371192

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Brief explanation: kilometer to mile

Length conversion multiplies by a factor. Meter is the base unit in the metric system. Kilometer = 1000 m, mile ≈ 1609 m. Foot = 0.3048 m, inch = 2.54 cm. The metric system (km, m, cm, mm) is used worldwide. The imperial system (mi, ft, in, yd) is common in the United States and United Kingdom. When converting, multiply the value by the appropriate factor—for example, to convert km to miles, multiply by 0.621371.

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Common conversion examples: kilometer to mile

Reference values for quick comparison. Use the converter above for any amount.

  • 1 kilometer=0.6214 mile
  • 5 kilometer=3.1069 mile
  • 100 kilometer=62.1371 mile

About the Units

kilometer (km)

Definition: A kilometer (km) is a unit of length in the International System of Units (SI). One kilometer equals 1,000 meters. The prefix kilo- indicates one thousand. It is the standard unit for expressing distances between geographical places on land in most of the world.
History: The kilometer is linked to the meter, which was originally defined in 1791 as one ten-millionth of the distance from the equator to the North Pole. The current meter is defined as the distance traveled by light in 1/299,792,458 of a second. The kilometer became widely adopted with the metric system in the 19th century.
Current use: The kilometer is the official unit for road distances in most countries. It appears on road signs, maps, and GPS devices. Running and cycling events are typically measured in kilometers. Countries like the US and UK still use miles for road distances, though the metric system is used in science and commerce.

mile (mi)

Definition: A mile (mi) is a unit of length in the imperial and US customary systems. The international mile is defined as exactly 1,609.344 meters, or 5,280 feet, or 1,760 yards. It is used primarily in the United States and United Kingdom.
History: The mile originated in Roman times as 1,000 paces (mille passus). The statute mile of 5,280 feet developed in England in 1593, based on the furlong (660 feet). The international mile was standardized in 1959 for consistency between English-speaking nations.
Current use: Miles are used for road distances in the US, UK, and a few other countries. Speed limits, odometers, and marathon distances (26.2 miles) use miles. Most of the world has adopted kilometers for road signage.

Sources

Kilometers and miles are the main distance units in metric and US customary systems. Use this conversion when reading road signs abroad, comparing race distances, or estimating travel. 1 km ≈ 0.621 mi.

Conversion factors and unit definitions follow international standards. For authoritative references, see: