Converting between miles per hour (mph) and kilometers per hour (km/h) is essential when traveling in Europe, reading GPS data, or understanding vehicle technical specifications from different markets.
One mile equals exactly 1.609344 kilometers (international definition since 1959). To convert mph to km/h, multiply by 1.609344. To convert km/h to mph, divide by 1.609344 (or multiply by 0.621371). A common easy-to-remember approximation: multiply mph by 1.6 to get km/h, or divide km/h by 1.6 to get mph.
📐 Formula
km/h = mph × 1.609344 | mph = km/h ÷ 1.609344
📊 Reference table
| mph | km/h (exact) | Context |
|---|---|---|
| 25 | 40.2 | School zone (US) |
| 35 | 56.3 | Urban road (US) |
| 55 | 88.5 | Rural road (US) |
| 65 | 104.6 | US Interstate (many states) |
| 70 | 112.7 | UK motorway limit |
| 75 | 120.7 | US highway (some states) |
| 80 | 128.7 | FR autoroute (≈) |
| 100 | 160.9 | German Autobahn (reference) |
💡 Practical examples
Example 1: European speed limit of 130 km/h in mph
130 km/h ÷ 1.609 = 80.8 mph. French motorway limit is approximately 81 mph for US drivers.
Example 2: US speed limit of 65 mph in km/h
65 mph × 1.609 = 104.6 km/h. A US freeway 65 mph limit is close to 105 km/h.
Example 3: running pace (6 mph in km/h)
6 mph × 1.609 = 9.7 km/h. A runner at 6 mph runs at approximately 10 km/h — a 10-minute mile pace.