How to convert miles to kilometres
Enter a distance in miles and read it in kilometres. The result updates as you type, and you can swap the units or copy the answer.
The international mile is defined as exactly 1.609344 kilometres (5,280 feet), so this conversion is exact.
1 mile = 1.609344 kilometres
Formula: kilometres = miles × 1.609344
- Multiply the number of miles by 1.609344.
- For a quick estimate, multiply by 1.6. For 10 miles that gives 16 km, against an exact 10 mi = 16.0934 km.
Common conversions
| Miles (mi) | Kilometres (km) |
|---|---|
| 1 mi | 1.60934 km |
| 5 mi | 8.04672 km |
| 10 mi | 16.0934 km |
| 13.1 mi | 21.0824 km |
| 26.2 mi | 42.1648 km |
| 50 mi | 80.4672 km |
| 100 mi | 160.934 km |
| 500 mi | 804.672 km |
Values are computed by the same converter as above, rounded to six significant digits. Need the other direction? See Kilometres to Miles.
Worked examples
A half marathon
A half marathon is 13.1 miles: 13.1 mi = 21.08 km.
A marathon
The marathon is 26 miles 385 yards, exactly 42.195 km. Rounded to 26.2 miles, 26.2 mi = 42.16 km, so the rounded figure comes out slightly short.
A road trip
A 250 mile journey is 250 mi = 402.3 km.
Things to keep in mind
- This is the statute (international) mile used on roads in the UK and US. The nautical mile, used at sea and in the air, is different.
- Road distances in the UK and the US are signposted in miles, while most of the world uses kilometres.