The quick method
Multiply the miles by 1.6. For extra accuracy, take the miles, add half of them, then add one tenth of the miles. For 50 miles: 50 + 25 + 5 = 80 km. The exact figure is 80.47 km.
Kilometres to miles
Multiply by 0.6, or divide by 1.6. 100 km is about 62 miles.
Common distances
- 5 km is about 3.1 miles
- 10 km is about 6.2 miles
- A half marathon is 13.1 miles, or 21.1 km
- A marathon is 26.2 miles, or 42.2 km
Speed limits
To turn km/h into mph, divide by 1.6. A 100 km/h limit is about 62 mph. Going the other way, 60 mph is about 97 km/h.