1 km
0.62 mi
Length Converter
KM to Miles Converter
Convert kilometers to miles instantly, in both directions — plus a full reference table for common running and driving distances.
- Live Bidirectional
- Precise 0.621371 Factor
- 100% Private
Convert Kilometers ⇄ Miles
=
Reference
Common KM to Miles Conversions
5 km
3.11 mi
10 km
6.21 mi
21.1 km
13.1 mi (half marathon)
42.2 km
26.2 mi (marathon)
50 km
31.1 mi
100 km
62.1 mi
1000 km
621.4 mi
FAQ
Frequently Asked Questions
1 kilometer equals approximately 0.621371 miles. This is a defined ratio, since 1 mile is exactly 1.609344 kilometers.
Multiply the number of kilometers by 0.621371. For example, 10 km × 0.621371 = 6.21 miles.
Multiply the number of miles by 1.60934. For example, 5 miles × 1.60934 = 8.05 km.
A marathon is 42.195 km, which equals exactly 26.2188 miles (often rounded to 26.2 miles). A half marathon is half that distance: 21.0975 km or 13.1 miles.
The US retains the imperial mile for road signage, speed limits, and everyday distance for historical reasons, having not fully adopted the metric system. Most of the rest of the world switched to the metric system (kilometers) during 20th-century metrication, which is why converting between the two is common when reading international maps, running events, or vehicle specs.
The KM to Mile Formula
To convert kilometers to miles, multiply by 0.621371: miles = km × 0.621371. To go the other way, multiply by 1.60934: km = miles × 1.60934. The exact defining ratio is 1 mile = 1.609344 kilometers.
Full Reference Table
| Kilometers | Miles |
|---|---|
| 1 km | 0.62 mi |
| 5 km | 3.11 mi |
| 10 km | 6.21 mi |
| 20 km | 12.43 mi |
| 21.1 km (half marathon) | 13.1 mi |
| 42.2 km (marathon) | 26.2 mi |
| 50 km | 31.07 mi |
| 100 km | 62.14 mi |
KM-to-miles conversions come up constantly for road trip planning, running/cycling race distances, speed limit signs, and reading specs on vehicles or GPS devices from countries using the other system.