# Miles per hour

**Miles per hour** is a

unit of

speed, expressing the number of international miles covered per

hour. The common abbreviation in everyday use is

*mph*, although formally

*mi/h* is preferable. The preferred

SI unit for velocity is

m/s, although

km/h is often used as a replacement for

**mi/h**.

1 mi/h is equal to:

- 0.44704 m/s, the SI derived unit
- 1.609344 km/h
- 88 ft/s
- approx. 0.868976 knots

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