42 kilometers equals 26.10 miles. Convert 42 km to miles instantly — close to the official marathon distance of 42.195 km.
To convert kilometers to miles, divide by 1.60934 (or multiply by 0.621371). So 42 km ÷ 1.60934 = 26.1 miles. The conversion factor is based on the exact definition of the international mile (1 mile = 1,609.344 meters).
| Distance | km | miles |
|---|---|---|
| 1 km | — | 0.62 |
| 1 mile | 1.61 | — |
| 5K | — | 3.11 |
| 5 miles | 8.05 | — |
| 10K | — | 6.21 |
| 10 miles | 16.09 | — |
| Half Marathon | 21.1 | 13.11 |
| Marathon | 42.2 | 26.22 |
| 50K | — | 31.07 |
| 50 miles | 80.47 | — |
| 100K | — | 62.14 |
| 100 miles | 160.93 | — |