The factor
mph = km/h ÷ 1.609344, the number of kilometres in a mile, so the factor is exact: 1 km/h is 0.621371 mph. Multiplying by 0.6 is a rough guide, 3.4% low; multiplying by 5/8 is closer, 0.6% high.
Speed limits
Rounded to two decimal places:
| Kilometres per hour | Miles per hour |
|---|---|
| 30 km/h | 18.64 mph |
| 50 km/h | 31.07 mph |
| 60 km/h | 37.28 mph |
| 80 km/h | 49.71 mph |
| 90 km/h | 55.92 mph |
| 100 km/h | 62.14 mph |
| 110 km/h | 68.35 mph |
| 120 km/h | 74.56 mph |
| 130 km/h | 80.78 mph |
On German autobahns without a limit the advised speed is 130 km/h, which is 80.78 mph.
Questions
What is kph?
The same as km/h: kilometres per hour. km/h is the standard symbol.
How do I go from mph to km/h?
Multiply by 1.609344: 70 mph is 112.65 km/h. The swap button above turns the converter round.