km/h to mph Converter

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Convert kilometers per hour to miles per hour using the exact factor 1 mph = 1.609344 km/h, which gives 1 km/h ≈ 0.6214 mph. Everyday anchors: 50 km/h = 31.07 mph (urban), 100 km/h = 62.14 mph (motorway), 130 km/h = 80.78 mph (autobahn), 200 km/h = 124.27 mph. Useful when reading European road signs or vehicle specs and reporting them in US/UK units. Browser-local.

Kilometer per hour (km/h)
Mile per hour (mph)

Kilometer per hour (km/h) → Mile per hour (mph)

Quick reference table

Kilometer per hour (km/h)Mile per hour (mph)
10 km/h6.2137 mph
25 km/h15.5343 mph
50 km/h31.0686 mph
60 km/h37.2823 mph
80 km/h49.7097 mph
100 km/h62.1371 mph
120 km/h74.5645 mph
150 km/h93.2057 mph
200 km/h124.2742 mph

Glossary

Kilometer per hour (km/h)

A kilometer per hour is the everyday speed unit used on road signs, vehicle speedometers and weather forecasts in nearly every country except the United States and the United Kingdom. 1 km/h = 0.2778 m/s = 0.6214 mph. Highway speed limits are commonly 100–130 km/h; a marathon world record pace is about 21 km/h.

Mile per hour (mph)

A mile per hour is the customary speed unit used in the United States, the United Kingdom and a few other countries for road traffic, athletic events and weather reports. 1 mph = 1.6093 km/h = 0.4470 m/s. Typical US highway limits are 55–75 mph; a 100 m sprinter peaks at about 27 mph; a hurricane is sustained winds above 74 mph.

Metric / SI speed

In the metric system, speed is reported in meters per second (scientific) or kilometers per hour (everyday). The relation is exact: 1 m/s = 3.6 km/h. Most countries use km/h on road signs and speedometers; m/s appears in physics, engineering, weather data and athletics where fine-resolution timing matters.

Imperial / US Customary speed

In the United States, the United Kingdom and a few other countries, road speeds are reported in miles per hour (mph). US engineering also uses feet per second (ft/s). 1 mph = 1.6093 km/h = 0.4470 m/s. Maritime and aviation worldwide use knots (1 knot = 1.852 km/h), independent of the metric/imperial divide.

Related tools

mph to km/h
Convert mph to km/h — 1 mph = 1.6093 km/h
m/s to km/h
Convert m/s to km/h — 1 m/s = 3.6 km/h
Knots to km/h
Convert knots to km/h — 1 knot = 1.852 km/h exactly
Speed Converter
Convert speed — m/s, km/h, mph, knots, ft/s, mach