Miles per hour

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.

Usage

thumb|[[Speed limit units on traffic signs around the world:

]]

thumb|upright|50 mph speed limit sign in the United Kingdom

thumb|upright|65 mph speed limit sign in the United States

Road traffic

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

Antigua and Barbuda
Bahamas
Belize
Dominica
Grenada
Liberia (occasionally)
Marshall Islands
Micronesia
Palau
Saint Kitts and Nevis
Saint Lucia
Saint Vincent and the Grenadines
United Kingdom
The following British Overseas Territories:
Anguilla
British Virgin Islands
British Indian Ocean Territory
Cayman Islands
Falkland Islands
Montserrat
Saint Helena, Ascension and Tristan da Cunha
Turks and Caicos Islands
The Crown dependencies:
Bailiwick of Guernsey
Isle of Man
Jersey
United States
The following United States overseas dependencies:
American Samoa
Guam
Northern Mariana Islands
Puerto Rico
United States Virgin Islands

Rail networks

Miles per hour is the unit used on the US, Canadian and Irish rail systems. Miles per hour is also used on British rail systems, excluding trams, some light metro systems, the Channel Tunnel and High Speed 1.

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

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|valign=top rowspan=4|1 mph

|= (exactly)