Km to Miles Calculator
Convert kilometres to miles, or miles to kilometres, in an instant. Enter a distance to get an accurate conversion, plus a handy reference table for common distances.
Distance Conversion
Enter a distance and choose your conversion direction
Enter a distance in kilometres to convert it into miles.
Your Conversion Result
Converted distance and unit breakdown
Enter a distance above and click Convert Distance to instantly see your result in the other unit.
Common Km to Miles Conversions
A quick-glance table of commonly searched kilometre-to-mile conversions, useful for travel, running, cycling, and everyday distance comparisons.
| Kilometres | Miles | Miles | Kilometres |
|---|---|---|---|
| 1 km | 0.6214 mi | 1 mi | 1.6093 km |
| 5 km | 3.1069 mi | 5 mi | 8.0467 km |
| 10 km | 6.2137 mi | 10 mi | 16.0934 km |
| 21.1 km | 13.1 mi (half marathon) | 13.1 mi | 21.1 km (half marathon) |
| 42.2 km | 26.2 mi (marathon) | 26.2 mi | 42.2 km (marathon) |
| 100 km | 62.1371 mi | 100 mi | 160.934 km |
Km to Miles FAQ
Everything you need to know about converting between kilometres and miles, including exact conversion factors and common use cases.
To convert kilometres to miles, multiply the distance in kilometres by 0.621371. For example, 10 kilometres multiplied by 0.621371 equals approximately 6.21 miles.
To convert miles to kilometres, multiply the distance in miles by 1.60934. For example, 5 miles multiplied by 1.60934 equals approximately 8.05 kilometres.
One kilometre is exactly 0.6213711922 miles. This is because one mile is defined as exactly 1.609344 kilometres, making the conversion factor a fixed, internationally agreed value rather than an approximation.
Miles remain the standard unit for road distances and speed limits in countries such as the United States and the United Kingdom, while most of the rest of the world uses the metric system and measures distance in kilometres. Both units are also common in sports such as running and cycling, depending on regional convention.
To convert a running pace from minutes per kilometre to minutes per mile, divide the pace by 0.621371, or equivalently multiply by 1.60934. For example, a pace of 5 minutes per kilometre is approximately 8 minutes and 3 seconds per mile.
The conversion factor is exact because the mile is legally defined in terms of the metre. One mile equals exactly 1609.344 metres, so the figure 0.621371 used for km to miles conversions is a rounded representation of an exact mathematical relationship.