How to use this converter
Choose your starting and destination units, then enter a value. Results update as you type. You can swap the direction and choose the displayed precision.
Example: Kilometers per hour to Miles per hour
value × 0.621371192237 = result
Here the starting unit is Kilometers per hour (km/h) and the result is in Miles per hour (mph). The calculator uses the catalog’s full factors before rounding the displayed result.
Worked examples
- 1 km/h ≈ 0.62137119 mph
- 10 km/h ≈ 6.21371192 mph
- 100 km/h ≈ 62.13711922 mph
Available speed options
Kilometers per hour (km/h) · Miles per hour (mph) · Meters per second (m/s) · Knots (kn) · Feet per second (ft/s)
Frequently asked questions
Why can displayed results differ slightly?
Numeric results are rounded for display. Increase the precision setting to see more digits. Different unit conventions can also produce different results; check the complete unit label.
Can I convert in the opposite direction?
Use the swap control to reverse the selected units or bases.
Related tools
All speed units · Browse all converters · mph to kph · kph to mph