1 kilometer = 0.621371 miles. Quick mental math: multiply km by 0.6 for a close estimate. Example: 10 km × 0.6 = 6 miles (exact: 6.21 miles).
Running distances: 5K = 3.1 mi, 10K = 6.2 mi, Marathon = 26.2 mi
Convert kilometers (km) to miles (mi) instantly. Perfect for running distances, road trips, and international travel.
Miles
6.21 mi
Precise: 6.2137 miles
Nautical Miles
5.3996 nmi
Meters
10,000 m
Feet
32,808 ft
| Kilometers | Miles | Common Use |
|---|---|---|
| 1 km | 0.62 mi | ~0.6 miles |
| 5 km | 3.11 mi | ~3.1 miles (5K race) |
| 10 km | 6.21 mi | ~6.2 miles (10K race) |
| 21.1 km | 13.11 mi | ~13.1 miles (Half Marathon) |
| 42.2 km | 26.22 mi | ~26.2 miles (Full Marathon) |
| 100 km | 62.14 mi | ~62.1 miles |
| 160.9 km | 99.98 mi | ~100 miles |
Kilometers and miles are both units of distance, but they come from different measurement systems. Kilometers (km) are part of the metric system used by most countries worldwide, while miles (mi) are part of the imperial system used primarily in the United States, United Kingdom, and a few other countries.
One kilometer equals approximately 0.621371 miles. Alternatively, one mile equals approximately 1.60934 kilometers.
For a quick estimate without a calculator, multiply kilometers by 0.6 (or slightly over ⅝). For example, 10 km ≈ 6 miles.
Most countries adopted the metric system in the 19th and 20th centuries for its simplicity (based on powers of 10). The United States, however, continued using the imperial system established during British colonial rule, which is why American road signs show miles while most European countries show kilometers.
