Kilometers to Miles Converter
Enter a value below to convert kilometers to miles - one kilometer is about 0.621371 mi (1 mile = 1.609344 km exactly). For the reverse, use our miles to kilometers converter.
1 km = 0.621371 mi. Enter a value above to convert kilometers to miles. Need the reverse? See miles to km.
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
- 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 to mile conversion table
| Kilometer [km] | Mile [mi] |
|---|---|
| 0.1 km | 0.0621371192 mi |
| 0.5 km | 0.3106855961 mi |
| 1 km | 0.6213711922 mi |
| 2 km | 1.2427423845 mi |
| 3 km | 1.8641135767 mi |
| 5 km | 3.1068559612 mi |
| 10 km | 6.2137119224 mi |
| 25 km | 15.5342798059 mi |
| 50 km | 31.0685596119 mi |
| 100 km | 62.1371192237 mi |
| 500 km | 310.6855961187 mi |
| 1,000 km | 621.3711922373 mi |
Popular kilometer to mile conversions
Common running and driving distances in miles, rounded to two decimals - including the 5K, 10K, half marathon (21.1 km) and marathon (42.2 km) that runners look up most.
| Kilometer [km] | Mile [mi] |
|---|---|
| 1 km | 0.62 mi |
| 5 km | 3.11 mi |
| 10 km | 6.21 mi |
| 21.1 km | 13.11 mi |
| 42.2 km | 26.22 mi |
| 50 km | 31.07 mi |
| 80 km | 49.71 mi |
| 100 km | 62.14 mi |
| 120 km | 74.56 mi |
| 150 km | 93.21 mi |
How to convert kilometers to miles
To convert kilometers to miles, multiply the number of kilometers by 0.621371. For example, 100 km × 0.621371 = 62.14 mi (or divide by 1.609344).
One mile is defined as exactly 1.609344 kilometers, so to convert a distance in kilometers to miles you divide by 1.609344 - or, equivalently, multiply by 0.6213711922:
miles = km ÷ 1.609344 = km × 0.6213711922
1 km = 0.6213711922 mi · 1 mi = 1.609344 km
Example. To convert a 10K race to miles, multiply by 0.6213711922: 10 km = 10 × 0.6213711922 = 6.21 mi. Going the other way, 5 miles is 5 × 1.609344 = 8.05 km.
When you need to convert kilometers to miles
Kilometer-to-mile conversion is what you reach for when a metric distance has to be read in miles. Common cases:
- Reading a 5K or 10K race distance in the miles familiar to runners in the US and UK.
- Seeing a half marathon (21.1 km) or marathon (42.2 km) in miles on a finisher's certificate.
- Working out how far a foreign road sign in kilometers really is in miles before you drive it.
- Converting a km/h speed limit abroad into the miles per hour your car's dial may show.
- Checking a car or bike's metric odometer or trip distance against mileage logs kept in miles.
Frequently asked questions
How many miles is 1 km?
One kilometer equals 0.621371 miles (0.6213711922 mi to be exact) - a little under two thirds of a mile.
How do I convert km to miles?
Multiply the number of kilometers by 0.621371, or divide by 1.609344. For example, 100 km = 100 × 0.621371 = 62.14 miles.
Is 1 km exactly 0.621371 miles?
Not exactly - 0.621371 is a rounded value. The exact definition runs the other way: 1 mile = 1.609344 km, so 1 km = 0.6213711922 miles when carried to more decimals.
How many miles is a 5K?
A 5K run is 5 kilometers, which equals 3.11 miles (3.10685596 mi to be exact).
How many miles is a 10K?
A 10K run is 10 kilometers, which equals 6.21 miles (6.21371192 mi to be exact).
What is 100 km/h in mph?
100 kilometers per hour equals 62.14 mph, because the kilometer-to-mile ratio also converts speeds: 100 × 0.621371 = 62.14.
How do I convert km to miles in my head?
Multiply the kilometers by 0.6, or take off about a third. For example, 100 km is roughly 60 miles, and the exact value is 62.14 miles.
How many km is 1 mile?
One mile equals 1.609344 km. To convert miles to kilometers, multiply by 1.609344.
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