KM to Miles Converter
Exact both ways — with the race distances runners actually look up.
Type in either field — the other updates instantly.
KM to Miles chart
| Kilometers | Miles |
|---|---|
| 1 km | 0.62 mi |
| 5 km | 3.11 mi |
| 10 km | 6.21 mi |
| 15 km | 9.32 mi |
| 20 km | 12.43 mi |
| 21.0975 km | 13.11 mi |
| 25 km | 15.53 mi |
| 30 km | 18.64 mi |
| 42.195 km | 26.22 mi |
| 50 km | 31.07 mi |
| 100 km | 62.14 mi |
| 160 km | 99.42 mi |
| 200 km | 124.27 mi |
| 300 km | 186.41 mi |
| 500 km | 310.69 mi |
| 1,000 km | 621.37 mi |
21.0975 km = half marathon · 42.195 km = marathon
How this is calculated
miles = km ÷ 1.609344 (exact — the mile is defined as 1,609.344 m)
A 5K is 3.11 miles, a 10K is 6.21, a half marathon (21.0975 km) is 13.11, and the marathon (42.195 km) is 26.22 — the chart carries all four because race distances are what this conversion gets asked for most.
The statute mile is defined as exactly 1,609.344 meters, so the conversion is exact; the ×0.62 shortcut is a rounding of the true 0.621371.
Frequently asked questions
How many miles is 1 km?
0.621371 miles. The mile is defined as exactly 1.609344 km, so km → miles is a division by that constant.
How many miles is a 5K and a 10K?
A 5K is 3.11 miles and a 10K is 6.21 miles. The half marathon (21.0975 km) is 13.11 miles and the full marathon (42.195 km) is 26.22 miles — all four are in the chart.
How do I convert km/h to mph?
Same factor — divide by 1.609344. 100 km/h is 62.14 mph. For speeds specifically, use the km/h to mph converter, which includes a speed-limit chart.
Why 1.609344 exactly?
The international mile is defined as 5,280 feet with the foot at exactly 0.3048 m: 5,280 × 0.3048 = 1,609.344 m. Definition, not measurement — so the conversion is exact.