KMH to MPH Converter
Convert kilometers per hour to miles per hour instantly, and back. Based on the exact 1 mile = 1609.344 m definition.
Independently verified for accuracy
Calculator by Toolsloft ↗- Result
- 0.621371 Miles per hour (mph)
- Conversion
- 1 Kilometers per hour (km/h) = 0.621371 Miles per hour (mph)
Convert kilometers per hour to miles per hour, and back with the swap button. Reach for it when a speed limit, a car spec, or a weather report is in km/h and you read speed in mph. Enter the value and read the result.
How this is calculated
The conversion follows the fixed relationship 1 mile = 1609.344 meters and 1 km = 1000 meters, so km/h is multiplied by 1000/1609.344 to get mph. That factor is about 0.621371. Results are shown to six decimal places.
How to use
- Enter the speed in kilometers per hour.
- Keep the direction on km/h to mph, or press Swap units for mph to km/h.
- Read the result in miles per hour.
Examples
- Highway speed:
100 km/h = 62.137119 mph - City limit:
60 km/h = 37.282272 mph - MPH to km/h:
60 mph = 96.56064 km/h
FAQ
- How do I convert km/h to mph?
- Multiply the speed in km/h by about 0.621371. For example, 100 km/h is about 62.14 mph.
- Why is the factor 0.621371?
- It comes from the exact definition of a mile as 1609.344 meters. Dividing 1000 meters by 1609.344 gives 0.621371 miles per kilometer.