Convert km/h to mph

1 km/h = 0.621371 mph. Enter a value in either field: the conversion works both ways.

Km/h

km/h

Mph

mph

Conversion formula

mph = km/h × 0.621371
km/h = mph ÷ 0.621371

Example: 70 km/h × 0.621371 = 43.496 mph.

In the United States, speed limits are posted in miles per hour. 65 mph, a common limit on American highways, is about 105 km/h.

How many mph are in 1 km/h?

1 km/h equals 0.621371 mph.

What is 100 km/h in mph?

100 km/h is about 62 mph.

How do I convert mph to km/h in my head?

Multiply by 1.6. 60 mph × 1.6 ≈ 96 km/h.