Kilometres per Hour to Miles per Hour

How to use KM/H to MPH Converter

1. 1
   Enter the value. Decimals are fine.
2. 2
   Read the conversion. A short reference table is shown for the values that come up most.

About converting km/h to mph

For a driver from the UK or United States, the useful form of this conversion is not a formula but a short list. European limits cluster on 50, 90, 100, 120 and 130 km/h, which are 31, 56, 62, 75 and 81 mph — none of them memorable in imperial, which is precisely why converting at speed is a poor idea and switching the instrument cluster to metric is a better one. Most cars built in the last fifteen years can do it from the driver display in under a minute. The mental shortcuts are worth knowing anyway for reading road signs and distances. Multiplying by six and dropping the last digit converts km/h to mph within about four percent and errs low, which is the safer direction. The reverse, adding sixty percent, is accurate to half a percent. One caution about instruments: type approval requires a speedometer never to indicate below true speed, so dials read high by several percent by design. A GPS figure from a phone or satnav is generally much closer to actual speed, but it is the dial that corresponds to what enforcement equipment is calibrated against in most disputes.

Frequently asked questions