Convert mph to km/h

1 mph = 1.609344 km/h. Enter a value in either field: the conversion works both ways.

Mph

mph

Km/h

km/h

Conversion formula

km/h = mph × 1.609344
mph = km/h ÷ 1.609344

Example: 43.5 mph × 1.609344 = 70.0065 km/h.

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 km/h are in 1 mph?

1 mph equals 1.609344 km/h.

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.