Miles to kilometers
One mile is exactly 1.609344 kilometers. That figure is a definition, not a rounded measurement: since 1959 the international mile has been fixed at 1,609.344 meters. Type any distance below, or use the chart and shortcuts on this page.
The formula
Miles to kilometers chart
| Miles | Kilometers | Good to know |
|---|---|---|
| 1 mi | 1.60934 km | |
| 2 mi | 3.21869 km | |
| 3.1 mi | 4.98897 km | Close to a 5K run |
| 5 mi | 8.04672 km | |
| 6.2 mi | 9.97793 km | Close to a 10K run |
| 10 mi | 16.0934 km | |
| 13.1 mi | 21.0824 km | Half marathon distance |
| 26.2 mi | 42.1648 km | Marathon distance (the official length is 42.195 km) |
| 50 mi | 80.4672 km | |
| 100 mi | 160.934 km |
Quick mental math
Multiply by 1.6. The answer lands within about 0.6% of the exact figure, which is close enough for road signs and trip planning. For 30 miles, 30 × 1.6 = 48 km, while the exact answer is 48.28 km. You can also multiply by 8 and divide by 5, which gives the same result.
Going the other way
To convert kilometers back to miles, multiply by 0.621371 or divide by 1.609344.
Common questions
How many kilometers are in one mile?
Exactly 1.609344. Most people round this to 1.61 or 1.6.
Why do some sources say 1.61 instead of 1.609344?
They round to two decimals, which is fine for everyday use. The difference grows with distance: 100 miles is 160.93 km exactly, but 161 km if you use 1.61.
Are US miles and UK miles the same?
For everyday use, yes. Both countries use the international mile of 1,609.344 meters.
How do I convert kilometers to miles?
Multiply kilometers by 0.621371, or divide by 1.609344. For example, 10 km is about 6.21 miles.