Kilometres to Miles (km to mi)
1 km = 0.6213712 mi. Multiply kilometres by 0.6213712; the box below does it both ways.
21.1 km = 13.1109 mi · miles to kilometres page
How to convert kilometres to miles
- Take the value in kilometres.
- Multiply by 0.6213712 (because 1 km = 0.6213712 mi).
- Example: 21.1 km × 0.6213712 = 13.1109 mi.
- Going back: divide by 0.6213712, or multiply by 1.609344.
Where this comes up
Divide by 1.609. Marathon distances (42.195 km is 26.2 miles), car mileage from US reviews, and treadmill screens are the usual reasons. A rough head estimate: km × 0.6; or use consecutive Fibonacci numbers (8 km is about 5 miles, 13 km about 8).
| km | mi |
|---|---|
| 1 | 0.62137 |
| 5 | 3.1069 |
| 10 | 6.2137 |
| 21.1 | 13.1109 |
| 42.2 | 26.2219 |
| 50 | 31.0686 |
| 80 | 49.7097 |
| 100 | 62.1371 |
| 120 | 74.5645 |
| 200 | 124.2742 |
| 500 | 310.6856 |
| 1,000 | 621.3712 |
| 1,500 | 932.0568 |
| 3,000 | 1,864.11 |
Questions people ask
How many miles are in 1 kilometre?
1 km = 0.6213712 mi. To convert, multiply the kilometre value by 0.6213712.
What is 100 km in mi?
100 km is 62.1371 mi.
How do I convert miles back to kilometres?
Divide by 0.6213712, or multiply by 1.609344: 1 mi = 1.609344 km.
More length conversions
Miles to Kilometres (mi to km) · m to ft · ft to m · cm to in · in to cm · cm to ft · ft to cm · mm to in · in to mm · ft to in · in to ft · all converters
Factors are the exact international definitions; last checked 2026-10-10.