MPH to KMH Converter
Convert miles per hour to kilometers per hour instantly, and back. Based on the exact 1 mile = 1609.344 m definition.
Independently verified for accuracy
Calculator by Toolsloft ↗- Result
- 1.609344 Kilometers per hour (km/h)
- Conversion
- 1 Miles per hour (mph) = 1.609344 Kilometers per hour (km/h)
Convert miles per hour to kilometers per hour, and back with the swap button. Use it when a US speed limit or car figure is in mph and you need km/h. Enter the value and read the result.
How this is calculated
The conversion uses the fixed relationship 1 mile = 1609.344 meters, so mph is multiplied by 1.609344 to get km/h. Results are shown to six decimal places. The reverse direction divides by the same factor.
How to use
- Enter the speed in miles per hour.
- Keep the direction on mph to km/h, or press Swap units for km/h to mph.
- Read the result in kilometers per hour.
Examples
- Highway speed:
60 mph = 96.56064 km/h - Fast lane:
100 mph = 160.9344 km/h - km/h to mph:
100 km/h = 62.137119 mph
FAQ
- How do I convert mph to km/h?
- Multiply the speed in mph by 1.609344. For example, 60 mph is about 96.56 km/h.
- Where does 1.609344 come from?
- It is the exact number of kilometers in a mile, since a mile is defined as 1609.344 meters, which is 1.609344 kilometers.