Kilometers to Miles (km to mi)
Convert kilometers to miles in one step, learn the formula, and grab a quick reference table.
Quick answer: To convert kilometers to miles, multiply the kilometer value by 0.621371. For example, 10 km × 0.621371 = 6.21 miles. One kilometer equals about 0.62 miles.
Kilometers to miles formula
The conversion is the inverse of the international mile definition:
miles = kilometers × 0.621371
This factor is the inverse of 1 mile = 1.609344 km, so it gives an accurate result. For everyday use you can round it to 0.6214 with no meaningful loss of accuracy.
How to convert km to miles in 3 steps
- Take the distance in kilometers (for example, 42.195 km, a marathon).
- Multiply by 0.621371 → 42.195 × 0.621371 = 26.219.
- Round as needed → 42.195 km ≈ 26.22 miles.
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| Kilometers (km) | Miles (mi) |
|---|---|
| 1 km | 0.6214 mi |
| 5 km | 3.1069 mi |
| 10 km | 6.2137 mi |
| 21.1 km | 13.1109 mi |
| 42.195 km | 26.2188 mi |
| 50 km | 31.0686 mi |
| 100 km | 62.1371 mi |
| 200 km | 124.2742 mi |
Kilometers vs miles
The kilometer (km) is a metric unit of distance used worldwide for distance and running. The mile (mi) is a unit of distance in the imperial and US customary systems. Because 1 km ≈ 0.62 mi, mile values are always smaller numbers than the equivalent kilometers.
Frequently asked questions
How do you convert kilometers to miles?
Multiply the kilometer value by 0.621371. For example, 10 km × 0.621371 = 6.21 miles.
How many miles is 1 km?
One kilometer equals about 0.6214 miles.
How many miles is 10 km?
10 kilometers equals about 6.21 miles (10 × 0.621371 = 6.2137 mi).