How Does It Work?
- Enter a distanceKilometers on the left, miles on the right. Editing either updates the other.
- Read the extrasMetres, feet and yards are useful for shorter distances and for sports pitches.
- Reuse it as a speedBecause the ratio is the same, 100 km/h converts to mph with the same number — shown in the last tile.
What Is It Used For?
A mile is exactly 1.609344 kilometers, fixed by international agreement in 1959. The conversion turns up on every road trip between metric and imperial countries, on running apps, and in any specification written for the other market.
- Reading road signs or speed limits abroad.
- Converting a race distance — a 5K, a 10K or a marathon.
- Checking a car’s fuel range or odometer in the other unit.
- Comparing running or cycling distances with friends who use the other system.
- Converting a flight or shipping distance quoted in miles.
Examples
| Kilometers | Miles | Note |
|---|---|---|
| 1 km | 0.621 mi | Roughly five-eighths of a mile |
| 5 km | 3.107 mi | Standard 5K race |
| 10 km | 6.214 mi | Standard 10K race |
| 42.195 km | 26.219 mi | Marathon |
| 100 km/h | 62.14 mph | Common motorway speed |
| 1.609 km | 1 mi | Exactly one mile |