Miles per hour

Last updated
Miles per hour
1974 MG MGB GT - Flickr - The Car Spy (14).jpg
Automobile speedometer, indicating speed in miles per hour
General information
Unit system Imperial, United States customary units
Unit of speed
1 mph in ...... is equal to ...
    km/h    1.609344
    m/s    0.44704
    knot    0.868976
    ft/s    1.467

Miles per hour (abbreviated mph, MPH or mi/h) is an imperial and United States customary unit of speed expressing the number of statute miles covered in one hour. It is used in the United States, United Kingdom and some Commonwealth nations, notably in the Caribbean region.

Imperial units System of units formerly used in the British Empire and still used in the United Kingdom

The system of imperial units or the imperial system is the system of units first defined in the British Weights and Measures Act of 1824, which was later refined and reduced. The Imperial units replaced the Winchester Standards, which were in effect from 1588 to 1825. The system came into official use across the British Empire. By the late 20th century, most nations of the former empire had officially adopted the metric system as their main system of measurement, although some imperial units are still used in the United Kingdom, Canada and other countries formerly part of the British Empire. The imperial system developed from what were first known as English units, as did the related system of United States customary units.

Speed Magnitude of velocity

In everyday use and in kinematics, the speed of an object is the magnitude of its velocity ; it is thus a scalar quantity. The average speed of an object in an interval of time is the distance travelled by the object divided by the duration of the interval; the instantaneous speed is the limit of the average speed as the duration of the time interval approaches zero.

Hour unit of time

An hour is a unit of time conventionally reckoned as ​124 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions.



65 mph speed limit sign in the United States 2014-08-19 11 59 11 Speed limit 65 miles per hour sign along northbound Nevada State Route 225 (Mountain City Highway) about 10.9 miles north of Nevada State Route 535 (Idaho Street) in Elko County, Nevada.JPG
65 mph speed limit sign in the United States
50 mph speed limit sign in the United Kingdom UK 50 mph speed limit sign.jpg
50 mph speed limit sign in the United Kingdom

Road traffic

Speed limits and road traffic speeds are given in miles per hour in the following jurisdictions (elsewhere kilometers per hour are used):

Antigua and Barbuda Country in the Caribbean

Antigua and Barbuda is a country in the West Indies in the Americas, lying between the Caribbean Sea and the Atlantic Ocean. It consists of two major islands, Antigua and Barbuda, and a number of smaller islands. The permanent population numbers about 81,800 and the capital and largest port and city is St. John's on Antigua. Lying near each other, Antigua and Barbuda are in the middle of the Leeward Islands, part of the Lesser Antilles, roughly at 17°N of the equator.

The Bahamas Country in North America

The Bahamas, known officially as the Commonwealth of The Bahamas, is a country within the Lucayan Archipelago. The archipelagic state consists of more than 700 islands, cays, and islets in the Atlantic Ocean, and is located north of Cuba and Hispaniola, northwest of the Turks and Caicos Islands, southeast of the U.S. state of Florida, and east of the Florida Keys. The capital is Nassau on the island of New Providence. The designation of "the Bahamas" can refer either to the country or to the larger island chain that it shares with the Turks and Caicos Islands. The Royal Bahamas Defence Force describes the Bahamas territory as encompassing 470,000 km2 (180,000 sq mi) of ocean space.

Belize country in Central America

Belize is an independent and sovereign country located on the north eastern coast of Central America. Belize is bordered on the northwest by Mexico, on the east by the Caribbean Sea, and on the south and west by Guatemala. It has an area of 22,970 square kilometres (8,867 sq mi) and a population of 387,879 (2017). Its mainland is about 180 mi (290 km) long and 68 mi (110 km) wide. It has the lowest population and population density in Central America. The country's population growth rate of 1.87% per year (2015) is the second highest in the region and one of the highest in the Western Hemisphere.

[29] [30]

Road traffic speeds in other countries are indicated in kilometres per hour.

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 meters 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.


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/s km/h mph knot ft/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.)

See also

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