Miles per hour

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miles per hour
1974 MG MGB GT - Flickr - The Car Spy (14).jpg
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

Miles per hour (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.

Usage[edit]

Speed limit units on traffic signs around the world:
  Miles per hour (mph)
  Both
  No speed limit units
50 mph speed limit sign in the United Kingdom
65 mph speed limit sign in the United States

Road traffic[edit]

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

Rail networks[edit]

Miles per hour is the unit used on the US and Canadian rail systems.[32] Miles per hour is also used on British rail systems, excluding trams and some light metro systems.[33]

Nautical and aeronautical usage[edit]

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[edit]

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[edit]

1 mph = 0.44704 m/s (exactly)
= 1.609344 km/h (exactly)
Conversions between common units of speed
m/s km/h mph knot ft/s
1 m/s = 1 3.6 2.236936* 1.943844* 3.280840*
1 km/h = 0.277778* 1 0.621371* 0.539957* 0.911344*
1 mph = 0.44704 1.609344 1 0.868976* 1.466667*
1 knot = 0.514444* 1.852 1.150779* 1 1.687810*
1 ft/s = 0.3048 1.09728 0.681818* 0.592484* 1

(* = approximate values)

See also[edit]

References[edit]

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  14. ^ Some signs are explicitly labeled in miles per hour,[5] but most are either explicitly[6][7][8][9][10][11] or implicitly measured in kilometers per hour.[12][13]
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