km to miles
1 kilometer equals 0.621371 miles. Formula: miles = kilometers ÷ 1.609344 (≈ km × 0.6214).
= 6.2137 mi
Other direction: miles to km
Formula
miles = kilometers ÷ 1.609344 (≈ km × 0.6214)
Example: 10 km = 6.2137 mi.
When you need km to miles
Race distances, road-trip planning, and car specs are the classic cases. A 5K run is 3.11 miles, a 10K is 6.21 miles, a half marathon (21.0975 km) is 13.11 miles, and a marathon (42.195 km) is 26.22 miles.
For a quick mental estimate, multiply kilometers by 0.6 — or use the Fibonacci trick: consecutive Fibonacci numbers approximate the ratio, so 8 km ≈ 5 miles and 13 km ≈ 8 miles. The converter gives the precise value when the estimate is not enough.
Common km to mi values
| Kilometers (km) | Miles (mi) |
|---|---|
| 1 | 0.621371 |
| 5 | 3.1069 |
| 10 | 6.2137 |
| 21.0975 | 13.1094 |
| 42.195 | 26.2188 |
| 50 | 31.0686 |
| 100 | 62.1371 |
| 160 | 99.4194 |
| 300 | 186.41 |
FAQ
How many miles is a 5K?
A 5K is 3.11 miles. One kilometer equals about 0.6214 miles, so multiply kilometers by 0.6214 to get miles.
What is a quick way to estimate km to miles in my head?
Multiply by 0.6 for a rough answer, or use consecutive Fibonacci numbers (5, 8, 13, 21…): 8 km is about 5 miles, and 13 km is about 8 miles. The ratio 1.609 sits close to the golden ratio, which is why the trick works.