Miles to Kilometers Converter
Enter a value below to convert miles to kilometers - one mile is exactly 1.609344 km (1 km is about 0.621371 mi). For the reverse, use our kilometers to miles converter.
1 mi = 1.609344 km. Convert miles to kilometers. Need the reverse? See km to miles.
Mile
- Definition
- A mile (symbol: mi) is a unit of length in the imperial and US customary systems, defined since 1959 as exactly 1,609.344 meters. One mile equals 5,280 feet, 1,760 yards, or 8 furlongs.
- History / origin
- The mile descends from the Roman "mille passus" ("a thousand paces"), about 1,480 meters. The longer English statute mile of 5,280 feet was fixed by an Act of Parliament in 1593, and the international mile of exactly 1,609.344 m was settled by the 1959 international yard and pound agreement.
- Current use
- The mile is used mainly in the United States and the United Kingdom for road distances and speed limits, and worldwide in aviation and athletics for the "mile" race. The separate nautical mile (1,852 m) is used at sea and in the air.
Kilometer
- Definition
- A kilometer (symbol: km) is a unit of length in the metric system and the International System of Units (SI), equal to one thousand meters (1 km = 1,000 m).
- History / origin
- The kilometer is built on the SI base unit, the meter, with the prefix "kilo" meaning one thousand. The meter was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole, and is now fixed by the speed of light.
- Current use
- The kilometer is the standard unit for road and map distances in almost every country that uses the metric system, and the basis for running events such as the 5K and 10K. Most of the world also posts speed limits in kilometers per hour.
Mile to kilometer conversion table
| Mile [mi] | Kilometer [km] |
|---|---|
| 0.1 mi | 0.1609344 km |
| 0.5 mi | 0.804672 km |
| 1 mi | 1.609344 km |
| 2 mi | 3.218688 km |
| 3 mi | 4.828032 km |
| 5 mi | 8.04672 km |
| 10 mi | 16.09344 km |
| 25 mi | 40.2336 km |
| 50 mi | 80.4672 km |
| 100 mi | 160.9344 km |
| 500 mi | 804.672 km |
| 1,000 mi | 1,609.344 km |
Popular mile to kilometer conversions
Common running and driving distances in kilometers, rounded to two decimals - including the half marathon (13.1 mi) and marathon (26.2 mi) that runners look up most.
| Mile [mi] | Kilometer [km] |
|---|---|
| 1 mi | 1.61 km |
| 2 mi | 3.22 km |
| 3 mi | 4.83 km |
| 5 mi | 8.05 km |
| 10 mi | 16.09 km |
| 13.1 mi | 21.08 km |
| 26.2 mi | 42.16 km |
| 50 mi | 80.47 km |
| 60 mi | 96.56 km |
| 100 mi | 160.93 km |
How to convert miles to kilometers
To convert miles to kilometers, multiply the number of miles by 1.609344. For example, 10 mi × 1.609344 = 16.09 km (or divide by 0.621371).
One mile is defined as exactly 1.609344 kilometers, so converting miles to kilometers is a single multiplication - no rounding is needed in the definition itself:
kilometers = miles × 1.609344
1 mi = 1.609344 km · 1 km = 0.6213711922 mi
Example. To convert a 26.2-mile marathon to kilometers, multiply by 1.609344: 26.2 mi = 26.2 × 1.609344 = 42.16 km. Going the other way, 100 km is 100 × 0.6213711922 = 62.14 mi.
When you need to convert miles to kilometers
Mile-to-kilometer conversion comes up whenever a distance given in miles has to fit a metric world. Common cases:
- Translating a US race distance such as a 5-mile or 10-mile run into the kilometers shown on a metric race clock.
- Reading a marathon (26.2 mi) or half marathon (13.1 mi) in the kilometers used by most timing chips and GPS watches.
- Planning a road trip abroad where distances and signposts are posted in kilometers.
- Converting a speed limit in miles per hour to the km/h shown on a metric speedometer.
- Comparing a treadmill or fitness-app pace logged in miles with training plans written in kilometers.
Frequently asked questions
How many km is 1 mile?
One mile equals 1.609344 kilometers exactly - a little over one and a half kilometers.
How do I convert miles to km?
Multiply the number of miles by 1.609344. For example, 10 miles = 10 × 1.609344 = 16.09 km.
Is 1 mile exactly 1.609344 km?
Yes - exactly, by definition. Since the 1959 international yard and pound agreement, one international mile is fixed at 1,609.344 meters, which is 1.609344 km.
How many km is a marathon?
A marathon is 26.2 miles, which equals 42.16 km (42.1648128 km to be exact). The official marathon distance is usually quoted as 42.195 km.
How many km is a half marathon?
A half marathon is 13.1 miles, which equals 21.08 km (21.0824064 km to be exact). It is usually rounded to 21.1 km.
What is 60 mph in km/h?
60 miles per hour equals 96.56 km/h, because the mile-to-kilometer ratio also converts speeds: 60 × 1.609344 = 96.56.
How do I convert miles to km in my head?
Multiply the miles by 1.6, or add about three fifths again. For example, 10 miles is roughly 16 km, and the exact value is 16.09 km.
How many miles is 100 km?
100 km equals 62.14 miles. To convert kilometers to miles, multiply by 0.621371.
Popular length unit conversions
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