How to change kmh in mph?

The fastest way to convert kilometers per hour to miles per hour is to use this simple formula:

The speed in miles per hour is equal to the speed in kilometers per hour divided by 1.609344. Since one kilometer per hour is equal to 1.609344 miles per hour,[1] that's the conversion ratio used in the formula.

Kilometers per hour and miles per hour are both units used to measure speed. Keep reading to learn more about each unit of measure.