Miles per hour to kilometers per hour (mph to km/h)
1 mph = 1.609344 km/h. Enter any value below to convert miles per hour to kilometers per hour instantly, or use the speed converter for every other unit.
Miles per hour to kilometers per hour conversion table
Miles per hour to kilometers per hour
Miles per hour (mph)
Kilometers per hour (km/h)
5 mph
8.04672 km/h
10 mph
16.09344 km/h
25 mph
40.2336 km/h
30 mph
48.28032 km/h
45 mph
72.42048 km/h
55 mph
88.51392 km/h
60 mph
96.56064 km/h
65 mph
104.60736 km/h
70 mph
112.65408 km/h
75 mph
120.7008 km/h
80 mph
128.74752 km/h
The formula
km/h = mph × 1.609344
1 mph = 0.44704 m/s (exact). 1 km/h = 1/3.6 m/s. These are exact definitions, so the only rounding is in the displayed result (10 significant digits).
When you need it
Mph to km/h is useful for comparing US speed limits, car specs and running or cycling speeds with metric ones. Multiply by 1.609344. US highway limits of 65–75 mph are roughly 105–120 km/h.