How to Convert mph to km/h (Speed Conversion)

To convert miles per hour to kilometres per hour, multiply by 1.609. For example, 60 mph × 1.609 = 96.6 km/h. To reverse it, divide km/h by 1.609.

The formula

• km/h = mph × 1.60934
• mph = km/h ÷ 1.60934

Since a mile is about 1.6 km, a speed in km/h is always a larger number than the same speed in mph.

Quick speed reference

• 20 mph ≈ 32 km/h
• 30 mph ≈ 48 km/h
• 50 mph ≈ 80 km/h
• 60 mph ≈ 97 km/h
• 70 mph ≈ 113 km/h

Where it matters

Speed limits, car dashboards and GPS switch between mph (US, UK) and km/h (most other countries). Runners and cyclists also compare pace across the two systems.

Convert instantly

The unit converter does mph ↔ km/h (plus m/s and knots) with live updates, in your browser. Related: How to convert miles to km.