Miles to KM Converter
Multiply miles by 1.609344 to get kilometers, because one international mile is exactly 1.609344 kilometers. 10 mi = 16.09344 km.
Running distances are often quoted in miles in the US and UK: 3.1 miles is the usual figure for a 5K, and 3.1 mi = 4.9889664 km comes out just under 5 km because 3.1 is rounded.
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(opens in a new tab)How to convert miles to kilometers
Formula: kilometers = miles × 1.609344
The constant is exact by definition: 1 mile = 1.609344 kilometers. It is not a rounded approximation.
The marathon is 42.195 kilometers, which is usually written as 26.2 miles. Because 26.2 is itself rounded, 26.2 mi = 42.1648128 km comes out slightly under the official 42.195 km.
Worked example: 26.2 mi to kilometers
This result is complete, not rounded.
Convert 26.2 mi
Input
26.2 mi
Output
26.2 × 1.609344 = 42.1648128 km
Common miles to kilometers conversions
| Miles (mi) | Kilometers (km) |
|---|---|
| 1 mi | 1.609344 km |
| 3.1 mi | 4.9889664 km |
| 5 mi | 8.04672 km |
| 10 mi | 16.09344 km |
| 13.1 mi | 21.0824064 km |
| 26.2 mi | 42.1648128 km |
| 50 mi | 80.4672 km |
| 100 mi | 160.9344 km |
When you need to convert miles to kilometers
- Road trips and driving abroad: distances on mile-based signs, compared with a kilometer-based map.
- Running: 5K, 10K, half marathon and marathon distances written in miles.
- Fitness trackers and apps set to a different unit than a training plan.
- Travel planning when a distance is quoted in miles and your car or map shows kilometers.
Things worth knowing
- Miles here are international statute miles. Nautical miles, exactly 1.852 kilometers, are a different unit. For road speeds, the Unit Converter converts mph to km/h.
Converting back and related converters
To go the other way, use the KM to Miles Converter, which applies miles = kilometers / 1.609344. For any other pair of units, open the Unit Converter, or browse every unit converter.
- Feet to Meters Converter: for shorter lengths measured in feet.
- Meters to Feet Converter: to convert meters into feet.
Frequently asked questions
How many km are in 1 mile?
Exactly 1.609344 kilometers. That is the international definition of the mile.
How many km is 10 miles?
10 mi = 16.09344 km. Multiply the miles by 1.609344, which is exact.
How many kilometers is 3.1 miles?
3.1 mi = 4.9889664 km. That is just under 5 kilometers, because 3.1 miles is a rounded version of the 5K distance.
How can I convert miles to km quickly?
Multiply by 1.6. For 10 miles that gives 16 km, within about 0.6 percent of the exact 16.09344 km.