Convert km/h to mph and mph to km/h: table and formula
Instantly convert km/h to mph and mph to km/h. Reference table of common speeds and conversion formula.
Published on January 11, 2026Converting 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.
Understanding the conversion
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
📊 Conversion 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
130 km/h ÷ 1.609 = 80.8 mph. French motorway limit is approximately 81 mph for US drivers.
65 mph × 1.609 = 104.6 km/h. A US freeway 65 mph limit is close to 105 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.