How to convert kilometres to miles
One kilometre equals 0.621371 miles, so multiply the number of kilometres by 0.621371:
mi = km × 0.621371
km = mi ÷ 0.621371 (1 mi = 1.6093 km)
Example: 5 km → 5 × 0.621371 = 3.1069 mi.
Going the other way, divide by 0.621371, or multiply by 1.6093; the miles to kilometres converter does it for you.
Everyday values
| Kilometres | Miles | For example |
|---|---|---|
| 5 km | 3.1069 mi | a 5K run |
| 10 km | 6.2137 mi | a 10K run |
| 21.0975 km | 13.1094 mi | a half marathon |
| 42.195 km | 26.2188 mi | a marathon |
| 100 km | 62.1371 mi | a long day's drive |
| 1,000 km | 621.371 mi | a long road trip |
When you need this conversion
Runners meet this conversion constantly: race distances are set in kilometres, while many training plans and watches in the US use miles. A 5K is 3.11 miles, a 10K is 6.21 miles and a marathon is 26.22 miles. Road signs in the UK and US use miles; almost everywhere else uses kilometres.
Kilometre to mile conversion table
| km | mi | km | mi |
|---|---|---|---|
| 1 km | 0.621371 mi | 16 km | 9.9419 mi |
| 2 km | 1.2427 mi | 17 km | 10.5633 mi |
| 3 km | 1.8641 mi | 18 km | 11.1847 mi |
| 4 km | 2.4855 mi | 19 km | 11.8061 mi |
| 5 km | 3.1069 mi | 20 km | 12.4274 mi |
| 6 km | 3.7282 mi | 21 km | 13.0488 mi |
| 7 km | 4.3496 mi | 22 km | 13.6702 mi |
| 8 km | 4.971 mi | 23 km | 14.2915 mi |
| 9 km | 5.5923 mi | 24 km | 14.9129 mi |
| 10 km | 6.2137 mi | 25 km | 15.5343 mi |
| 11 km | 6.8351 mi | 26 km | 16.1557 mi |
| 12 km | 7.4565 mi | 27 km | 16.777 mi |
| 13 km | 8.0778 mi | 28 km | 17.3984 mi |
| 14 km | 8.6992 mi | 29 km | 18.0198 mi |
| 15 km | 9.3206 mi | 30 km | 18.6411 mi |
About the units
- Kilometre (km): 1,000 metres.
- Mile (mi): 5,280 feet, exactly 1,609.344 metres.
Both are units of length. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many miles are in one kilometre?
One kilometre is 0.621371 miles. One mile is 1.6093 kilometres.
How do I convert kilometres to miles?
Multiply the value in kilometres by 0.621371. To go back, divide by 0.621371.
What is 5 km in miles?
5 km = 3.1069 mi.
What is 10 km in miles?
10 km = 6.2137 mi.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.