View source for Miles per hour

{{short description|Unit of speed}}
{{Use dmy dates|date=April 2022}}
{{About|the unit of speed|the comic book|MPH (comics)|other uses|MPH (disambiguation){{!}}MPH}}
{{Infobox unit
| name     = miles per hour
| image    = 1974 MG MGB GT - Flickr - The Car Spy (14).jpg
| caption  = [[Speedometer]], indicating speed in miles per hour
| standard = Imperial, United States customary units
| quantity = [[speed]]
| symbol   = mph
| symbol2  =
| units1   = [[kilometres per hour|km/h]]
| inunits1 = 1.609344
| units2   = [[metre per second|m/s]]
| inunits2 = 0.44704
}}
'''Miles per hour''' ('''mph''', '''m.p.h.''', '''MPH''', or '''mi/h''') is a [[imperial units|British imperial]] and [[United States customary unit]] of [[speed]] expressing the number of [[mile]]s 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==
[[File:World Map of Speed Limit Units on Traffic Signs.svg|thumb|[[Speed limit]] units on [[traffic sign]]s around the world:
{{legend|#005ce6|[[Kilometres per hour]] (km/h)}}
{{legend|#ff8000|Miles per hour (mph)}}
{{legend|#22b14c|Both}}
{{legend|#c0c0c0|No speed limit units}}
]]
[[File:UK 50 mph speed limit sign.jpg|thumb|upright|50&nbsp;mph speed limit sign in the United Kingdom]]
[[File: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|thumb|upright|65&nbsp;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]]<ref>{{cite web|url=http://www.thenassauguardian.com/index.php?option=com_content&view=article&id=40272:major-hurricanes-to-hit-the-bahamas&catid=84:hurricane|title=The Nassau Guardian|publisher=The Nassau Guardian|access-date=21 August 2014|url-status=live|archive-url=https://web.archive.org/web/20140226134053/http://www.thenassauguardian.com/index.php?option=com_content&view=article&id=40272:major-hurricanes-to-hit-the-bahamas&catid=84:hurricane|archive-date=26 February 2014}}</ref> 
*[[Belize]]<ref>{{cite web|url=http://amandala.com.bz/news/?p=263765&upm_export=pdf|title=Ideas and Opinions – Marijuana – another perspective - Amandala Newspaper|website=amandala.com.bz|date=26 October 2012 |access-date=29 April 2018|url-status=live|archive-url=http://archive.wikiwix.com/cache/20130918101337/http://amandala.com.bz/news/?p=263765&upm_export=pdf|archive-date=18 September 2013}}</ref> 
*[[Dominica]]<ref>{{cite web|url=http://dominicanewsonline.com/news/homepage/news/general/ophelia-less-organised-but-still-a-strong-tropical-storm/|title=Ophelia less organised but still a strong tropical storm|date=22 September 2011 |publisher=Dominica News Online|access-date=21 August 2014|url-status=live|archive-url=https://web.archive.org/web/20140301191854/http://dominicanewsonline.com/news/homepage/news/general/ophelia-less-organised-but-still-a-strong-tropical-storm/|archive-date=1 March 2014}}</ref> 
*[[Grenada]]<ref>{{cite web|url=http://www.grenadabroadcast.com/news/other/15927-troublesome-figures|title=George Grant - TROUBLESOME FIGURES|publisher=Grenada Broadcast|date=4 July 2013|access-date=21 August 2014|url-status=dead|archive-url=https://web.archive.org/web/20140301151310/http://www.grenadabroadcast.com/news/other/15927-troublesome-figures|archive-date=1 March 2014 }}</ref> 
*[[Liberia]] (occasionally){{refn|1=Some signs are explicitly labeled in miles per hour,<ref>{{cite web|title=Image by draperc|work=[[Mapillary]]|date=9 September 2018|access-date=21 April 2019|url=https://www.mapillary.com/map/im/rRQhpVZYDFklcp8oWe1B5A}}</ref> but most are either explicitly<ref>{{cite web|title=Image by draperc|work=Mapillary|date=9 September 2018|access-date=21 April 2019|url=https://www.mapillary.com/map/im/rus0GTiGvcb6DIZzDRgevQ}}</ref><ref>{{cite web|title=Image by mkanyala|work=Mapillary|date=11 September 2017|access-date=21 April 2019|url=https://www.mapillary.com/map/im/OkmgUecAgpBPeloj6D6uxg}}</ref><ref>{{cite web|title=Image by mkanyala|work=Mapillary|date=11 September 2017|access-date=21 April 2019|url=https://www.mapillary.com/map/im/DGMzTH-GSmcOyKfAB7bElg}}</ref><ref>{{cite web|title=Image by mkanyala|work=Mapillary|date=11 September 2017|access-date=21 April 2019|url=https://www.mapillary.com/map/im/0z03JxfeqLhNyoNQkCS3Aw}}</ref><ref>{{cite web|title=Image by mkanyala|work=Mapillary|date=11 September 2017|access-date=21 April 2019|url=https://www.mapillary.com/map/im/SDxlSc95Q5yyGY_SaHiIGg}}</ref><ref>{{cite web|title=Image by mkanyala|work=Mapillary|date=11 September 2017|access-date=21 April 2019|url=https://www.mapillary.com/map/im/q5-Kh0S1jSH-khLm28tFeg}}</ref> or implicitly measured in kilometers per hour.<ref>{{cite web|title=Image by danbjoseph|first=Dan B.|last=Joseph|work=Mapillary|date=14 April 2016|access-date=21 April 2019|url=https://www.mapillary.com/map/im/MLcmRHdx62oi2j_GsLkzhQ}}</ref><ref>{{cite web|title=Image by mkanyala|work=Mapillary|date=11 September 2017|access-date=21 April 2019|url=https://www.mapillary.com/map/im/NRGs7Obh7pmIINLZnQK15Q}}</ref>}}
*[[Marshall Islands]]
*[[Federated States of Micronesia|Micronesia]]
*[[Palau]]
*[[Saint Kitts and Nevis]]<ref>{{cite web|url=http://www.thestkittsnevisobserver.com/2012/08/17/ts-isaac.html|title=Businesses Close Early Due to Passage of TS Isaac|publisher=The St. Kitts-Nevis Observer|date=22 August 2012|access-date=21 August 2014|url-status=dead|archive-url=https://web.archive.org/web/20130203193050/http://thestkittsnevisobserver.com/2012/08/17/ts-isaac.html|archive-date=3 February 2013}}</ref>
*[[Saint Lucia]]<ref>{{cite web|url=http://www.thevoiceslu.com/local_news/2008/may/24_05_08/Retrial_goes_ahead.htm|title=The Voice - The national newspaper of St. Lucia since 1885|publisher=Thevoiceslu.com|date=1 October 2004|access-date=21 August 2014|url-status=dead|archive-url=https://web.archive.org/web/20140301112923/http://www.thevoiceslu.com/local_news/2008/may/24_05_08/Retrial_goes_ahead.htm|archive-date=1 March 2014}}</ref> 
*[[Saint Vincent and the Grenadines]]<ref>{{cite web|author=21 August 2014 :52 (AST)|url=http://www.iwnsvg.com/2010/10/31/st-vincent-appeals-for-aid-as-tomas-leaves-millions-and-millions-in-damage/|title=St. Vincent appeals for aid as Tomas leaves 'millions and millions' in damage – I-Witness News|publisher=Iwnsvg.com|date=31 October 2010|access-date=21 August 2014|url-status=live|archive-url=https://web.archive.org/web/20140226162929/http://www.iwnsvg.com/2010/10/31/st-vincent-appeals-for-aid-as-tomas-leaves-millions-and-millions-in-damage/|archive-date=26 February 2014}}</ref> 
*[[United Kingdom]]<ref>[https://www.gov.uk/speed-limits Speed limits] {{webarchive|url=https://web.archive.org/web/20150322102525/https://www.gov.uk/speed-limits |date=22 March 2015}} (UK) Department for Transport. Retrieved 4 August 2015</ref>
*The following [[British Overseas Territories]]:
**[[Anguilla]]<ref>{{cite web|url=http://www.gov.ai/laws/V010-00-Vehicles%20and%20Road%20Traffic%20Act/|title=Vehicles and Road Traffic Act|publisher=Government of Anguilla|date=15 December 2014|access-date=26 March 2020}}</ref>
**[[British Virgin Islands]]<ref>{{cite web|url=http://www.bvibeacon.com/120105/hurricane120105.html|title=Welcome to The BVI Beacon Online|publisher=Bvibeacon.com|date=1 December 2005|access-date=21 August 2014|url-status=dead|archive-url=https://web.archive.org/web/20150402114428/http://www.bvibeacon.com/120105/hurricane120105.html|archive-date=2 April 2015}}</ref><ref>{{cite web|url=https://bvi.gov.vg/sites/default/files/resources/G00222_SI%20No%2029%20~%20Road%20Traffic%20%28Motor%20Vehicle%20Registration%20and%20Operation%20and%20Driver%20and%20Vehicle%20Licensing%29%20Regulations%202009.pdf|page=28|publisher=Government of the Virgin Islands|date=20 July 2009|accessdate=27 April 2022|title=Road traffic (motor vehicle registration and operation, and driver and vehicle licensing) regulations, 2009 arrangement of regulations}}</ref>
**[[British Indian Ocean Territory]]
**[[Cayman Islands]]<ref>{{cite web|url=http://www.compasscayman.com/caycompass/2013/06/06/Driver-exceeded-critical-speed-of-91-mph,-jury-hears/|title=Driver exceeded critical speed of 91 mph, jury hears :: Cayman Compass|publisher=Compasscayman.com|access-date=21 August 2014|url-status=live|archive-url=https://web.archive.org/web/20140226134415/http://www.compasscayman.com/caycompass/2013/06/06/Driver-exceeded-critical-speed-of-91-mph,-jury-hears/|archive-date=26 February 2014}}</ref>
**[[Falkland Islands]]<ref>{{cite web|url=http://www.penguin-news.com/index.php/columns/item/318-an-islanders-offerings-from-essex-by-james-marsh|title=Columns - An Islander's offerings from Essex by James Marsh|publisher=Penguin-news.com|date=19 April 2012|access-date=21 August 2014|url-status=dead|archive-url=https://web.archive.org/web/20141016220818/http://www.penguin-news.com/index.php/columns/item/318-an-islanders-offerings-from-essex-by-james-marsh|archive-date=16 October 2014}}</ref>
**[[Montserrat]]
**[[Saint Helena, Ascension and Tristan da Cunha]]<ref>{{cite web|url=http://sthelenaonline.org/2012/10/23/paraglider-pilot-flies-over-st-helena/|title=Flying Frenchman takes off in 'overgrown pushchair' &#124; St Helena Online|publisher=Sthelenaonline.org|date=23 October 2012|access-date=21 August 2014|url-status=dead|archive-url=https://web.archive.org/web/20140301082555/http://sthelenaonline.org/2012/10/23/paraglider-pilot-flies-over-st-helena/|archive-date=1 March 2014}}</ref> 
**[[Turks and Caicos Islands]]<ref>{{cite web|url=http://suntci.com/police-urging-motorists-to-slow-down-p183-106.htm|title=Police urging motorists to slow down|publisher=Suntci.com|date=15 July 2009|access-date=21 August 2014|url-status=live|archive-url=https://web.archive.org/web/20140228075122/http://suntci.com/police-urging-motorists-to-slow-down-p183-106.htm|archive-date=28 February 2014}}</ref>
*The [[Crown dependencies]]:
**[[Bailiwick of Guernsey]]
**[[Isle of Man]]
**[[Jersey]]
*[[United States]]<ref name="twsJun15a">{{cite magazine|title=Modern Living: Think Metric|magazine=Time Magazine|quote=Meanwhile, the metrication 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 metres, litres, and grams. ...a road sign outside Fergus Falls reads, ST. CLOUD 100 MILES OR 161 KILOMETERS. Other signs note that 55 mph equals 88 kilometres per hour.|date=9 June 1975|url=http://www.time.com/time/magazine/article/0,9171,913145,00.html|access-date=15 June 2010|url-status=dead|archive-url=https://web.archive.org/web/20110122055540/http://www.time.com/time/magazine/article/0,9171,913145,00.html|archive-date= 22 January 2011}}</ref>
*The following [[Dependent territories of the United States|United States overseas dependencies]]:
**[[American Samoa]]<ref>{{cite web|url=http://www.samoanews.com/?q=node/76715|title=Our Traffic Problems Are Going To Get Worse|publisher=Samoa News|date=3 June 2013|access-date=21 August 2014|url-status=dead|archive-url=https://web.archive.org/web/20130914064728/http://samoanews.com/?q=node%2F76715|archive-date=14 September 2013}}</ref>
**[[Guam]]<ref>{{cite web|url=http://www.guampdn.com/guampublishing/special-sections/mailahalom08/typhoon.shtml|title=Maila Halom|publisher=Guampdn.com|access-date=21 August 2014}}</ref> 
**[[Northern Mariana Islands]]<ref>[http://www.saipantribune.com/newsstory.aspx?newsID=39808] {{webarchive|url=https://web.archive.org/web/20140301142524/http://www.saipantribune.com/newsstory.aspx?newsID=39808|date=1 March 2014}}</ref>
**[[Puerto Rico]] 
**[[United States Virgin Islands]]<ref>{{cite web|author=Conor Foley (Staff Writer)|url=http://virginislandsdailynews.com/cops-teen-was-driving-75-mph-in-city-rollover-crash-1.1171653?cache=03D163D03D163Dp%3A%2Fhe3D03Dn63Freporti3D19.11145issed-1%3FparentPage%3D2.1244|archive-url=https://web.archive.org/web/20140307150209/http://virginislandsdailynews.com/cops-teen-was-driving-75-mph-in-city-rollover-crash-1.1171653?cache=03D163D03D163Dp%3A%2Fhe3D03Dn63Freporti3D19.11145issed-1%3FparentPage%3D2.1244|url-status=dead|archive-date=7 March 2014|title=Cops: Teen was driving 75 mph in city rollover crash|publisher=Virgin Islands Daily News|date=6 July 2011|access-date=21 August 2014}}</ref><ref>{{cite web|author=JOY BLACKBURN (Daily News Staff)|url=http://virginislandsdailynews.com/news/weather-to-begin-clearing-up-today-as-isaac-leaves-area-1.1363173|title=Weather to begin clearing up today as Isaac leaves area - News|publisher=Virgin Islands Daily News|date=24 August 2012|access-date=21 August 2014|url-status=dead|archive-url=https://archive.today/20130916042230/http://virginislandsdailynews.com/news/weather-to-begin-clearing-up-today-as-isaac-leaves-area-1.1363173|archive-date=16 September 2013}}</ref>

=== Rail networks ===
Miles per hour is the unit used on the US, Canadian and Irish rail systems.<ref name="Classlist">{{cite web
  | title = A. Classes of Track 
  | work = Rules Respecting Track Safety
  | publisher = Transport Canada
  | date =3 November 2008 | url = http://www.tc.gc.ca/eng/railsafety/rules-tce31-98.htm
  | archive-url = https://web.archive.org/web/20120825070252/http://www.tc.gc.ca/eng/railsafety/rules-tce31-98.htm
  | archive-date = 25 August 2012
  }} Archived 25 August 2012.</ref><ref>{{Cite web|title=Republic of Ireland|url=http://www.railsigns.uk/overseas/ireland2/ireland2.html|access-date=22 February 2021|website=www.railsigns.uk}}</ref><ref>{{Cite web|last=Rail|first=Irish|title=Network Statement|url=https://www.irishrail.ie/en-ie/about-us/iarnrod-eireann-network-statement|access-date=22 February 2021|website=Irish Rail|language=en}}</ref> Miles per hour is also used on British rail systems, excluding trams, some light metro systems, the [[Channel Tunnel]] and [[High Speed 1]].<ref>{{Cite web|title=Permanent Speed Restriction Signs|url=http://www.railsigns.uk/photos/p_psr2/p_psr2.html|access-date=10 July 2020|website=www.railsigns.uk}}</ref>

===Nautical and aeronautical usage===
Nautical and aeronautical applications favour the [[knot (unit)|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==
:{|
|-
|valign=top rowspan=4|1&nbsp;mph
|= {{val|0.44704|ul=m/s}} (exactly)
|-
|= {{val|1.609344|ul=km/h}} (exactly)
|}

{{Speed conversions}}

==See also==
{{div col|colwidth=30em}}
* [[Acceleration]]
* [[Kilometres per hour]]
* [[Velocity]]
{{div col end}}

==References==
{{reflist|30em}}

{{Imperial units}}
{{United States Customary Units}}

[[Category:Units of velocity]]
[[Category:Imperial units]]
[[Category:Customary units of measurement in the United States]]