Convert kilometers to miles instantly with a live calculator, a distance and speed chart, and the manual math.
Driving in Europe, Canada, or Australia, all road distances and speed limits are in kilometers, while US drivers think in miles. A rental car customer, a truck driver on a cross-border route, or a tourist estimating travel time all need this conversion. Running is just as common: a European runner training for a 10K or half-marathon wants to know the distance in miles to follow a US-based training plan.
Speed is where it matters for safety: a 100 km/h European limit is 62 mph, and the 120 km/h expressway limit is about 75 mph. The chart below includes the speeds most drivers encounter. Because a mile is longer than a kilometer, the mile result is always the smaller number — a useful sanity check when you type numbers in a hurry.
Convert 100 kilometers to miles:
| Kilometers | Miles | Kilometers | Miles | Speed km/h | mph |
|---|---|---|---|---|---|
| 1 km | 0.62 mi | 25 km | 15.53 mi | 30 km/h | 18.6 mph |
| 2 km | 1.24 mi | 30 km | 18.64 mi | 50 km/h | 31.1 mph |
| 5 km | 3.11 mi | 42.195 km | 26.22 mi | 70 km/h | 43.5 mph |
| 8 km | 4.97 mi | 50 km | 31.07 mi | 80 km/h | 49.7 mph |
| 10 km | 6.21 mi | 80 km | 49.71 mi | 100 km/h | 62.1 mph |
| 15 km | 9.32 mi | 100 km | 62.14 mi | 120 km/h | 74.6 mph |
| 21.1 km (half) | 13.11 mi | 200 km | 124.27 mi | 130 km/h | 80.8 mph |
1 km = 0.621371 miles. Divide kilometers by 1.609344 to convert.
10 × 0.621371 = 6.21 miles. A 10K race is about 6.2 miles.
Multiply by 0.6. 100 km → 60 miles (real answer 62.1). For exact results use 0.621371.
42.195 km = 26.219 miles. Runners and organizers use both depending on the country.