Kilometres to Miles Converter
This free length converter changes Kilometres (km) into Miles (mi) and back again. Kilometres are the metric unit used for road distances across most of the world, while miles are standard in the United States and the United Kingdom. The tool is useful for travel distances, race lengths and reading speed-limit or odometer figures.
How it works
The converter multiplies by the exact factor 1 km = 0.6213711922 mi, which follows from the definition that one statute mile is exactly 1609.344 metres. To convert miles back to kilometres it divides by that factor (or multiplies by 1.609344). Both input fields are linked, so editing either recomputes the other instantly.
Example
To convert 42 km to miles, multiply by 0.6213711922:
42 × 0.6213711922 = 26.10 mi
So a 42 km drive is about 26.1 miles — close to the 26.2-mile marathon distance.
| Kilometres (km) | Miles (mi) |
|---|---|
| 1 km | 0.621371 mi |
| 5 km | 3.1069 mi |
| 10 km | 6.2137 mi |
| 100 km | 62.1371 mi |
All calculations run entirely in your browser — no data is sent to any server.