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Miles per hour
	Automobile speedometer, indicating speed in miles per hour
General information
Unit system	Imperial, United States customary units
Unit of	speed
Symbol	mph
Conversions
km/h	1.609344
m/s	0.44704
knot	0.868976
ft/s	1.467

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.

Usage

50 mph speed limit sign in the United Kingdom

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
The Bahamas^[1]
Belize^[2]
Dominica^[3]
Grenada^[4]
Liberia (occasionally)^[14]
Saint Kitts and Nevis^[15]
St Lucia^[16]
Saint Vincent and the Grenadines^[17]
Samoa (along with kilometers per hour)^[18]
United Kingdom^[19]
The following British Overseas Territories:
The Crown dependencies:
United States^[25]
The following United States overseas dependencies:

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	= (exactly)
	= (exactly)
	? 1.467 ft/s (approximately)
	?


	m/s	km/h	mph	knot	ft/s
1 m/s =	1	3.6
1 km/h =		1
1 mph =			1
1 knot =		1.852		1
1 ft/s =					1

(Values in bold face are exact.)

References

^ "The Nassau Guardian". The Nassau Guardian. Archived from the original on 2014-02-26. Retrieved .
^ "Ideas and Opinions - Marijuana - another perspective - Amandala Newspaper". amandala.com.bz. Archived from the original on 18 September 2013. Retrieved 2018.
^ "Ophelia less organised but still a strong tropical storm". Dominica News Online. Archived from the original on 2014-03-01. Retrieved .
^ "George Grant - TROUBLESOME FIGURES". Grenada Broadcast. 2013-07-04. Archived from the original on 2014-03-01. Retrieved .
^ "Image by draperc". Mapillary. September 9, 2018. Retrieved 2019.
^ "Image by draperc". Mapillary. September 9, 2018. Retrieved 2019.
^ "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.
^ "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.
^ "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.
^ "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.
^ "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.
^ Joseph, Dan B. (April 14, 2016). "Image by danbjoseph". Mapillary. Retrieved 2019.
^ "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.
^ 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]
^ "Businesses Close Early Due to Passage of TS Isaac". The St. Kitts-Nevis Observer. 2012-08-22. Archived from the original on 2013-02-03. Retrieved .
^ "The Voice - The national newspaper of St. Lucia since 1885". Thevoiceslu.com. 2004-10-01. Archived from the original on 2014-03-01. Retrieved .
^ Thursday, 21 August 2014 03:30:52 (AST) (2010-10-31). "St. Vincent appeals for aid as Tomas leaves 'millions and millions' in damage - I-Witness News". Iwnsvg.com. Archived from the original on 26 February 2014. Retrieved .
^ "Gale warning issued, Apia town drowns". Samoaobserver.ws. 2013-02-02. Archived from the original on 2014-02-27. Retrieved .
^ Speed limits Archived 2015-03-22 at the Wayback Machine (UK) Department for Transport. Retrieved 4 August 2015
^ "Welcome to The BVI Beacon Online". Bvibeacon.com. 2005-12-01. Archived from the original on 2015-04-02. Retrieved .
^ "Driver exceeded critical speed of 91 mph, jury hears :: Cayman Compass". Compasscayman.com. Archived from the original on 2014-02-26. Retrieved .
^ "Columns - An Islander's offerings from Essex by James Marsh". Penguin-news.com. 2012-04-19. Archived from the original on 2014-10-16. Retrieved .
^ "Flying Frenchman takes off in 'overgrown pushchair' | St Helena Online". Sthelenaonline.org. 2012-10-23. Archived from the original on 2014-03-01. Retrieved .
^ "Police urging motorists to slow down". Suntci.com. 2009-07-15. Archived from the original on 2014-02-28. Retrieved .
^ "Modern Living: Think Metric". Time Magazine. 9 June 1975. Archived from the original on 22 January 2011. Retrieved 2010. Meanwhile, the metricization of America is already taking place. Individual federal agencies, school systems, states and industries, as well as radio announcers, supermarkets, beverage bottlers and ballpark scoreboards, are hastening the everyday use of meters, liters and grams. ...a road sign outside Fergus Falls reads, ST. CLOUD 100 MILES OR 161 KILOMETERS. Other signs note that 55 m.p.h. equals 88 kilometers per hour.
^ "Our Traffic Problems Are Going To Get Worse". Samoa News. 2013-06-03. Archived from the original on 2013-09-14. Retrieved .
^ "Maila Halom". Guampdn.com. Retrieved .
^ [1] Archived March 1, 2014, at the Wayback Machine
^ Conor Foley (Staff Writer) (2011-07-06). "Cops: Teen was driving 75 mph in city rollover crash". Virgin Islands Daily News. Retrieved .^{[permanent dead link]}
^ JOY BLACKBURN (Daily News Staff) (2012-08-24). "Weather to begin clearing up today as Isaac leaves area - News". Virgin Islands Daily News. Archived from the original on 2013-09-16. Retrieved .
^ "A. Classes of Track". Rules Respecting Track Safety. Transport Canada. 3 November 2008. Archived from the original on 2012-08-25. Archived 25 August 2012.

[1] "The Nassau Guardian". The Nassau Guardian. Archived from the original on 2014-02-26. Retrieved .

[2] "Ideas and Opinions - Marijuana - another perspective - Amandala Newspaper". amandala.com.bz. Archived from the original on 18 September 2013. Retrieved 2018.

[3] "Ophelia less organised but still a strong tropical storm". Dominica News Online. Archived from the original on 2014-03-01. Retrieved .

[4] "George Grant - TROUBLESOME FIGURES". Grenada Broadcast. 2013-07-04. Archived from the original on 2014-03-01. Retrieved .

[5] "Image by draperc". Mapillary. September 9, 2018. Retrieved 2019.

[6] "Image by draperc". Mapillary. September 9, 2018. Retrieved 2019.

[7] "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.

[8] "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.

[9] "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.

[10] "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.

[11] "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.

[12] Joseph, Dan B. (April 14, 2016). "Image by danbjoseph". Mapillary. Retrieved 2019.

[13] "Image by mkanyala". Mapillary. September 11, 2017. Retrieved 2019.

[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]

[15] "Businesses Close Early Due to Passage of TS Isaac". The St. Kitts-Nevis Observer. 2012-08-22. Archived from the original on 2013-02-03. Retrieved .

[16] "The Voice - The national newspaper of St. Lucia since 1885". Thevoiceslu.com. 2004-10-01. Archived from the original on 2014-03-01. Retrieved .

[17] Thursday, 21 August 2014 03:30:52 (AST) (2010-10-31). "St. Vincent appeals for aid as Tomas leaves 'millions and millions' in damage - I-Witness News". Iwnsvg.com. Archived from the original on 26 February 2014. Retrieved .

[18] "Gale warning issued, Apia town drowns". Samoaobserver.ws. 2013-02-02. Archived from the original on 2014-02-27. Retrieved .

[19] Speed limits Archived 2015-03-22 at the Wayback Machine (UK) Department for Transport. Retrieved 4 August 2015

[20] "Welcome to The BVI Beacon Online". Bvibeacon.com. 2005-12-01. Archived from the original on 2015-04-02. Retrieved .

[21] "Driver exceeded critical speed of 91 mph, jury hears :: Cayman Compass". Compasscayman.com. Archived from the original on 2014-02-26. Retrieved .

[22] "Columns - An Islander's offerings from Essex by James Marsh". Penguin-news.com. 2012-04-19. Archived from the original on 2014-10-16. Retrieved .

[23] "Flying Frenchman takes off in 'overgrown pushchair' | St Helena Online". Sthelenaonline.org. 2012-10-23. Archived from the original on 2014-03-01. Retrieved .

[24] "Police urging motorists to slow down". Suntci.com. 2009-07-15. Archived from the original on 2014-02-28. Retrieved .

[twsJun15a-25] "Modern Living: Think Metric". Time Magazine. 9 June 1975. Archived from the original on 22 January 2011. Retrieved 2010. Meanwhile, the metricization of America is already taking place. Individual federal agencies, school systems, states and industries, as well as radio announcers, supermarkets, beverage bottlers and ballpark scoreboards, are hastening the everyday use of meters, liters and grams. ...a road sign outside Fergus Falls reads, ST. CLOUD 100 MILES OR 161 KILOMETERS. Other signs note that 55 m.p.h. equals 88 kilometers per hour.

[26] "Our Traffic Problems Are Going To Get Worse". Samoa News. 2013-06-03. Archived from the original on 2013-09-14. Retrieved .

[27] "Maila Halom". Guampdn.com. Retrieved .

[28] [1] Archived March 1, 2014, at the Wayback Machine

[29] Conor Foley (Staff Writer) (2011-07-06). "Cops: Teen was driving 75 mph in city rollover crash". Virgin Islands Daily News. Retrieved .^{[permanent dead link]}

[30] JOY BLACKBURN (Daily News Staff) (2012-08-24). "Weather to begin clearing up today as Isaac leaves area - News". Virgin Islands Daily News. Archived from the original on 2013-09-16. Retrieved .

[Classlist-31] "A. Classes of Track". Rules Respecting Track Safety. Transport Canada. 3 November 2008. Archived from the original on 2012-08-25. Archived 25 August 2012.

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