# Miles per hour

Miles per hour (mph, MPH or mi/h) is a British imperial and United States customary unit of speed expressing the number of statute miles covered in one hour. It is used in the United Kingdom, the United States, and a number of countries with fewer than one million inhabitants, most of which are UK or US territories, or have close historical ties with the UK or US.

Miles per hour
Automobile speedometer, indicating speed in miles per hour
General information
Unit systemImperial, United States customary units
Unit ofspeed
Symbolmph
Conversions
1 mph in ...... is equal to ...
km/h   1.609344
m/s   0.44704
knot   0.868976
ft/s   1.467

## Usage

Speed limits and road traffic speeds are given in miles per hour in the following jurisdictions:

### Rail networks

Miles per hour is the unit also used in the Canadian rail system,[31] which uses km/h on roads.

### Nautical and aeronautical usage

Nautical and aeronautical applications favour the knot as a common unit of speed. (One knot is one nautical mile per hour, with a nautical mile being exactly 1,852 metres or about 6,076 feet.)

### Other usage

In some countries mph may be used to express the speed of delivery of a ball in sporting events such as cricket, tennis and baseball.

## Conversions

 1 mph = 0.44704 m/s (exactly) = 1.609344 km/h (exactly) ≈ 1.467 ft/s (approximately) ≈ 0.868976 kn
Conversions between common units of speed
m/skm/hmphknotft/s
1 m/s = 13.62.2369361.9438443.280840
1 km/h = 0.27777810.6213710.5399570.911344
1 mph = 0.447041.60934410.8689761.466667
1 knot = 0.5144441.8521.15077911.687810
1 ft/s = 0.30481.097280.6818180.5924841

(Values in bold face are exact.)

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