How do you convert km/h to mph?

Multiply km/h by approximately 0.621371 to get mph (exact factor: 1 mph = 1.609344 km/h, so mph = km/h ÷ 1.609344).

Detailed answer

Kilometers per hour and miles per hour both measure distance per hour; they differ only by the length of the mile versus the kilometer. Since 1 international mile = 1.609344 km, speed in mph equals speed in km/h divided by 1.609344. The reciprocal 0.621371… is convenient for mental estimates.

Relationship context

Road speeds and vehicle specs switch between metric and US/UK customary units; aviation often uses knots, but car culture still uses mph in several countries.

Quick conversion table

Kilometer per Hour (kph)Mile per Hour (mph)
0.10.0621371192
10.6213711922
21.2427423845
31.8641135767
42.485484769
53.1068559612
63.7282271534
74.3495983457
84.9709695379
95.5923407301
Kilometer per Hour (kph)Mile per Hour (mph)
106.2137119224
2012.4274238447
3018.6411357671
4024.8548476895
5031.0685596119
6037.2822715342
7043.4959834566
8049.709695379
9055.9234073014
10062.1371192237

More Kilometer per Hour converters

Dedicated pages from Kilometer per Hour to every other hub speed unit (m/s, km/h, mph, knots, ft/s, Mach, Beaufort, c).