KM to Miles Converter
Divide kilometers by 1.609344 to get miles, because the international mile is defined as exactly 1.609344 kilometers. 10 km = 6.21371192237 mi.
Road signs, maps and running events switch between the two units. The table includes the half marathon and the marathon, at 21.0975 and 42.195 kilometers.
Runs in your browser. Conversions are calculated on your own device, and nothing you enter is sent to a server. This page opens the Unit Converter with this conversion selected, so you can change either unit.
Did this tool help you? ☕
WebzTools is free to use. If this tool saved you some time, you can support the project with a coffee and help us keep improving the tools.
(opens in a new tab)How to convert kilometers to miles
Formula: miles = kilometers / 1.609344
The constant is exact by definition: 1 mile = 1.609344 kilometers. It is not a rounded approximation.
A mile is longer than a kilometer, so the number of miles is always smaller than the number of kilometers: 5 km = 3.10685596119 mi. The marathon is 42.195 km = 26.2187574565 mi. That mile figure is rounded, and the distance is usually quoted as 26.2 miles.
Worked example: 10 km to miles
The answer below is shown to 12 significant digits. The full value has more digits, so treat the displayed figure as rounded.
Convert 10 km
Input
10 km
Output
10 / 1.609344 = 6.21371192237 mi
Common kilometers to miles conversions
| Kilometers (km) | Miles (mi) |
|---|---|
| 1 km | 0.621371192237 mi |
| 5 km | 3.10685596119 mi |
| 10 km | 6.21371192237 mi |
| 21.0975 km | 13.1093787282 mi |
| 42.195 km | 26.2187574565 mi |
| 50 km | 31.0685596119 mi |
| 100 km | 62.1371192237 mi |
When you need to convert kilometers to miles
- Road distance: a trip planned in kilometers, read against mile-based signs and odometers.
- Running: the 5K and 10K, the half marathon and the marathon.
- Travel and maps: converting a distance shown by a map in one unit to the other.
- Cycling and race distances that are published in kilometers.
Things worth knowing
- Miles here are international statute miles. Nautical miles, which are exactly 1.852 kilometers, are a different unit and are not converted on this page.
Converting back and related converters
To go the other way, use the Miles to KM Converter, which applies kilometers = miles × 1.609344. For any other pair of units, open the Unit Converter, or browse every unit converter.
- Meters to Feet Converter: for shorter distances measured in meters and feet.
- Feet to Meters Converter: to convert feet into meters.
Frequently asked questions
How many miles are in 1 km?
1 km = 0.621371192237 mi. The figure does not end, so it is rounded when written out in decimals.
Is a kilometer longer than a mile?
No. A mile is longer: one mile is exactly 1.609344 kilometers, so the same distance has a smaller number in miles than in kilometers.
How many miles are a 5K and a 10K?
5 km = 3.10685596119 mi and 10 km = 6.21371192237 mi.
Is a marathon exactly 26.2 miles?
No. A marathon is 42.195 kilometers, and 26.2 miles is a rounded way of writing that distance. The engine's result for 42.195 km is 26.2187574565 mi.
How do I convert km to miles quickly?
Multiply by 0.6 for a rough figure. It runs about 3 percent low: 10 km comes out as 6 miles against the exact 6.21371192237 mi.