Convert mph to km
Miles per Hour to Kilometers per Hour Explained
International Travel Calculations
The conversion formula is km/h = mph × 1.60934. Common conversions: 30 mph = 48.3 km/h, 55 mph = 88.5 km/h, 65 mph = 104.6 km/h, 75 mph = 120.7 km/h. American speed limits in km/h: residential (25 mph) = 40.2 km/h, highway (65 mph) = 104.6 km/h, interstate (75 mph) = 120.7 km/h.
Digital Speedometer Settings
Modern vehicles allow switching between km/h and mph on digital displays. When importing a US vehicle to Europe (or vice versa), verify the speedometer can display the local unit. Some older vehicles require a speedometer gear change or aftermarket conversion. For complete speed reference tables, see our speed conversion table.
Practical mph to km/h Conversion Guide
Quick Mental Math Method
For approximate conversions without a calculator, multiply mph by 1.6: 60 mph ≈ 96 km/h, 70 mph ≈ 112 km/h. A more precise mental trick: double the mph, then subtract 20% of the doubled number. Example: 65 mph → 130 → minus 26 = 104 km/h (actual: 104.6 km/h). This method gets you within 1% accuracy for everyday driving speeds and is useful when road signs suddenly change units at country borders.
Vehicle Import and Compliance
When importing American vehicles to metric countries, speedometer conversion is a legal requirement. In the EU, the primary speedometer display must show km/h. Japanese Domestic Market (JDM) vehicles exported to the US need the opposite conversion. Odometer readings also need conversion: 100,000 miles = 160,934 km. This affects vehicle valuation, insurance, and maintenance schedules. For km to mph conversion, use our km to mph calculator.