How to use it
- Type the number of Miles per Hour in the first field.
- Read the result in Kilometers per Hour. You can also type in the Kilometers per Hour field to convert the other way.
- Use the table of common values, or copy the result with one click.
How it works
Formula: km/h = mph × 1.609344
1 mph = 1.609344 km/h, and 1 km/h = 0.621371 mph.
Results use the exact definitions of both units. The page shows up to 6 decimal places; copy the value for full precision.
Examples
20 mph in km/h
20 mph = 32.18688 km/h, using km/h = mph × 1.609344.
30 mph in km/h
30 mph = 48.28032 km/h, using km/h = mph × 1.609344.
60 mph in km/h
60 mph = 96.56064 km/h, using km/h = mph × 1.609344.
Frequently asked questions
How do I convert Miles per Hour to Kilometers per Hour?
Use the formula km/h = mph × 1.609344. For example, 20 mph = 32.18688 km/h.
How do I convert Kilometers per Hour back to Miles per Hour?
Use the reverse formula mph = km/h × 0.62137119. For example, 1 km/h = 0.621371 mph.
How accurate is this converter?
It uses the exact legal definitions of the units, so the only rounding is in the number of decimals shown. Copy the result to get the full value.
Privacy
The conversion runs entirely in your browser. Nothing you type is sent anywhere.