The simple rule: 1 mile ≈ 1.6 km (exactly 1.60934).
For speed, mph × 1.6 ≈ km/h.
Quick list
5 miles ≈ 8 km
10 miles ≈ 16 km
50 mph ≈ 80 km/h
70 mph ≈ 112 km/h
Driving tip
If you’re in a km/h country, mentally multiply by 1.6. For example, 60 mph ≈ 100 km/h—a useful number to remember.
For exact values
Use the Speed & Distance Converter any time: /speed-distance-converter