Kilometres per Hour to Miles per Hour Converter

Kilometres per Hour to Miles per Hour Converter

This free speed converter changes Kilometres per Hour (km/h) into Miles per Hour (mph) and back again. Kilometres per hour are the metric speed unit used across most of the world, while miles per hour are standard in the US and UK. The tool is handy for reading foreign speed limits, vehicle specs and GPS readouts.

How it works

The converter multiplies by the exact factor 1 km/h = 0.6213711922 mph, the same ratio as kilometres to miles, since the time unit (per hour) is identical on both sides. It derives from the statute mile being exactly 1609.344 metres. To convert mph back to km/h it multiplies by 1.609344. Both fields are linked and recalculate instantly as you type.

Example

To convert 130 km/h to miles per hour, multiply by 0.6213711922:

130 × 0.6213711922 = 80.78 mph

So a 130 km/h limit is about 80.8 mph.

All calculations run entirely in your browser — no data is sent to any server.