Direct answer
How Many km/h in 1 mph? 1 mph = 1.609344 km/h
1 mile per hour equals exactly 1.609344 kilometers per hour. Quick speed answer for road signs, cars, and running.
Question
How many kilometers per hour are in one mile per hour?
1 mph equals exactly 1.609344 km/h.
1 mph
1.609344 km/h
55 mph
≈ 88.514 km/h
60 mph
≈ 96.561 km/h
Formula
km/h = mph × 1.609344
Explanation
Because 1 mile is exactly 1.609344 km, the same factor converts miles per hour to kilometers per hour.
Multiply mph by 1.609344 to get km/h. Multiply km/h by 0.621371 to get mph.
Common road examples: 60 mph ≈ 96.56 km/h; 100 km/h ≈ 62.14 mph.