Convert kilometers to miles instantly. Enter a value below, or use the formula and reference table further down the page.
In practice
Kilometer-to-mile conversion matters most for anyone in the US or UK reading distances, race lengths, or speed figures quoted in metric — which is most of the rest of the world. The exact relationship is 1 km = 0.621371 miles. This comes up constantly in running and cycling: a 10km race is 6.2 miles, and a marathon's 42.195km is the famously non-round 26.2 miles — the metric distance was standardized first, and the mile figure is simply what that distance happens to convert to.
How to convert kilometers to miles
Multiply the value by 0.6213711922.
mi = km × 0.6213711922Example: 10 km = 6.2137 mi.
Kilometers to Miles conversion table
| Kilometers (km) | Miles (mi) |
|---|---|
| 1 km | 0.6214 mi |
| 2 km | 1.2427 mi |
| 3 km | 1.8641 mi |
| 4 km | 2.4855 mi |
| 5 km | 3.1069 mi |
| 10 km | 6.2137 mi |
| 15 km | 9.3206 mi |
| 20 km | 12.4274 mi |
| 25 km | 15.5343 mi |
| 50 km | 31.0686 mi |
| 100 km | 62.1371 mi |
Frequently asked questions
How many miles is 1 kilometer?
1 kilometer equals 0.6214 miles.
What is the formula to convert km to mi?
To convert km to mi, multiply the value by 0.6213711922. The full formula is: mi = km × 0.6213711922.
How do I convert miles back to kilometers?
Use the same calculator above and type your value into the miles field instead — it converts in both directions. Or use the reverse formula: km = mi ÷ 0.6213711922.
Is the km to mi conversion exact?
The conversion factor used here (0.6213711922) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.