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Unit of speed From Wikipedia, the free encyclopedia
Miles per hour (mph, m.p.h., MPH, or mi/h) is a British imperial and United States customary unit of speed expressing the number of miles travelled in one hour. It is used in the United Kingdom, the United States, and a number of smaller countries, most of which are UK or US territories, or have close historical ties with the UK or US.
miles per hour | |
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![]() Speedometer, indicating speed in miles per hour | |
General information | |
Unit system | Imperial, United States customary units |
Unit of | speed |
Symbol | mph |
Conversions | |
1 mph in ... | ... is equal to ... |
km/h | 1.609344 |
m/s | 0.44704 |
Speed limits and road traffic speeds are given in miles per hour in the following jurisdictions:
Miles per hour is the unit used on the US, Canadian and Irish rail systems.[32][33][34] Miles per hour is also used on British rail systems, excluding trams, some light metro systems, the Channel Tunnel and High Speed 1.[35]
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.)
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.
m/s | km/h | mph (mi/h) | knot | fps (ft/s) | |
---|---|---|---|---|---|
1 m/s = | 1 | 3.600000 | 2.236936* | 1.943844* | 3.280840* |
1 km/h = | 0.277778* | 1 | 0.621371* | 0.539957* | 0.911344* |
1 mph (mi/h) = | 0.44704 | 1.609344 | 1 | 0.868976* | 1.466667* |
1 knot = | 0.514444* | 1.852 | 1.150779* | 1 | 1.687810* |
1 fps (ft/s) = | 0.3048 | 1.09728 | 0.681818* | 0.592484* | 1 |
(* = approximate values)
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