Miles per hour is a unit of measurement. It measures speed. It is the number of miles moved in an hour.

Miles per hour is the unit used for speed limits on roads in the United Kingdom and the United States. It is normally abbreviated in everyday use to mph or MPH. In technical publications it is sometimes abbreviated as mi/h.

The SI unit for velocity (speed, with a direction of movement) is m·s⁻¹ (metres per second).

Speed limit units on traffic signs around the world:      Kilometers per hour (km/h)     Miles per hour (mph)     Both     No speed limit units