Editing Metrication (section)

===Status by country/region===

[[File:Metric_and_imperial_systems_(2019).svg|upright=3.4|thumb|center|Countries by their dominant system of measurement ([[Metric system|metric]], [[Imperial units|imperial]], and [[US customary]]) as of 2023 (based on popular and official usage)]]

''Links in the '''country/region''' point to articles about metrication in that country/region.''<ref>{{cite web
 |url          = http://www.cl.cam.ac.uk/~mgk25/volatile/dunn-papersizes.pdf
 |title        = Notes on the standardization of paper sizes
 |author       = AD Dunn
 |location     = Ottawa
 |page         = 11
 |year         = 1969
 |access-date  = 7 December 2018
 |archive-date = 15 November 2017
 |archive-url  = https://web.archive.org/web/20171115213957/http://www.cl.cam.ac.uk/~mgk25/volatile/dunn-papersizes.pdf
 |url-status   = live
}}</ref>

<!-- NOTE: the "<span style="display:none">SOMETHING</span>" markups ensure correct sorting order. -->
{| class="wikitable sortable plainrowheaders"
|+Overview of global metrication
|-
!scope="col"| Year official metrication<br /> process started<ref>{{cite book
 | title          = The International Bureau of Weights and Measures 1875–1975: NBS Special Publication 420
 | url            = https://archive.org/details/internationalbur420page
 | quote          = gram-atom .
 | page           = [https://archive.org/details/internationalbur420page/page/244 244]
 | date           = 20 May 1975
| editor1-last   = Page
 | editor1-first  = Chester H
 | editor2-last   = Vigoureux
 | editor2-first  = Paul
 | publisher      = National Bureau of Standards
 | location       = [[Washington, D.C.]]
}}</ref><ref>{{cite book
 |url = https://books.google.com/books?id=uYCNFkRgXCoC&q=Revolution+in+Measurement%3A+Western+European+Weights+and+Measures+Since+the+Age+of+Science
 | title          = Revolution in Measurement – Western European Weights and Measures Since the Age of Science
 | first1         = Ronald Edward
 | last1          = Zupko
 | series         = Memoirs of the American Philosophical Society
 | volume         = 186
 | year           = 1990
 | pages          = 242–245
 | isbn           = 978-0-87169-186-6
 |access-date      = 21 April 2012
}}</ref><ref>{{cite book
|url = https://archive.org/stream/metricversuseng00boargoog#page/n4/mode/2up
|title=The Metric ''versus'' the English System of Weights and Measures
|id = Research Report Number 42
|date = October 1921
|pages = 12–13
|publisher = National Industrial Conference Board
|access-date = 1 June 2013}}</ref>
!scope="col"| Country/Region
!scope="col" width=180|Previous system<br />of measure
!scope="col" class=unsortable|Current official status of metrication
|-
| 1795
!scope="row"| France
| [[French units of measurement|French]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1814
!scope="row"| Portugal<ref group="Note">Including [[Portuguese Empire|Portuguese colonies]], most of them now independent countries.</ref>
| [[Portuguese customary units|Portuguese]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="2"| 1820
!scope="row"| Belgium
| [[Belgian units of measurement|Belgian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Netherlands
| [[Dutch units of measurement|Dutch]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1843
!scope="row"| Algeria
| [[Algerian units of measurement|Algerian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1848
!scope="row"| [[Metrication in Chile|Chile]]
| [[Chilean units of measurement|Chilean (variants of Spanish)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="2"| 1852<ref>{{cite web |url=http://lamar.colostate.edu/~hillger/international.html |archive-url=https://web.archive.org/web/20120831004546/http://lamar.colostate.edu/~hillger/international.html |url-status=dead |archive-date=31 August 2012 |title=Metrication in Mexico |website=USMA |publisher=U.S. Metric Association |access-date=24 November 2014}}</ref>
!scope="row"| Mexico
| [[Mexican units of measurement|Mexican (variants of Spanish)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, (some national and regional units are still in use and some [[United States customary units]] also in use in some industries)
|-
!scope="row"| Spain
| [[Spanish customary units|Spanish]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1860<ref>{{Cite book|last=Washburn|first=Edward Wight|url=https://books.google.com/books?id=zkErAAAAYAAJ&q=international+critical+tables+1926&pg=PA10|title=International Critical Tables of Numerical Data, Physics, Chemistry and Technology|date=1926|publisher=National Research Council}}</ref><br>1906<ref>{{Cite web|title=Act No. 1519, s. 1906 {{!}} GOVPH|url=https://www.officialgazette.gov.ph/1906/08/03/act-no-1519-s-1906/|access-date=27 February 2021|website=Official Gazette of the Republic of the Philippines}}{{Dead link|date=November 2023 |bot=InternetArchiveBot |fix-attempted=yes}}</ref>
!scope="row"| Philippines
| [[Philippine units of measurement|Philippine]] ([[Spanish customary units|Spanish]], [[United States customary units|US customary]] and local)
| bgcolor="#CEE6F2" data-sort-value="1blue" | Mainly Metric. The Philippines first adopted the metric system in 1860 because of the Spanish Colonial government; imperial units were introduced by the American Colonial government; however, the metric system was made the official system of measurement in 1906 through Act No. 1519, s. 1906. US customary units still in use for body measurements and small products while the metric system is used for larger measurements; e.g. floor area, highway length, tonnage.
|-
| 1861
!scope="row"| Italy
| [[Italian units of measurement|Italian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="2"| 1862<ref>{{cite web|url=http://www.inmetro.gov.br/inmetro/historico.asp|title=Histórico do Inmetro|publisher=Inmetro.gov.br|access-date=24 November 2014|archive-date=28 February 2015|archive-url=https://web.archive.org/web/20150228101309/http://www.inmetro.gov.br/inmetro/historico.asp|url-status=dead}}</ref>
!scope="row"| Brazil
| [[Brazilian units of measurement|Brazilian (variants of Portuguese)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, but some non-metric units are used for specific areas: rural land – [[alqueire]]; cattle weight – [[arroba]]; screen sizes – polegada (inch); tyre pressure – libra-força por polegada quadrada, but referred by its English abbreviation: psi.
|-
!scope="row"| [[Metrication in Peru|Peru]]
| [[Peruvian units of measurement|Peruvian (variants of Spanish)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, but inches (''pulgadas'') are used for screen sizes and tires. Fuel is sold in US gallons (''galones'').
|-
|rowspan="2"| 1863
!scope="row"| Uruguay
| [[Uruguayan units of measurement|Uruguayan (variants of Spanish)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Argentina
| [[Argentine units of measurement|Argentine (variants of Spanish)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric

|-
| 1864
!scope="row"| Romania
| [[Romanian units of measurement|Romanian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1868
!scope="row" data-sort-value="Germany" | [[North German Confederation]]
| [[German units of measurement|German]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1869
!scope="row" data-sort-value="Germany" |[[Southern Germany|South German states]]
| [[German units of measurement|German]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1871
!scope="row"| Austria
| [[Obsolete Austrian units of measurement|Austrian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1872<ref group="Note">Many German states, particularly those under French tutelage during the Napoleonic Wars ([[Rheinbund]]) adopted the metre 1806–15.</ref>
!scope="row"| Germany
| [[German units of measurement|German]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1873<ref>{{cite web
|url = http://www.dmdm.rs/en/Istorijat.php
|title = History
|publisher = Ministry of finance and economy: Directorate of Measures and Precious Metals
|access-date = 28 March 2013
|location = [[Belgrade|Beograd]], [[Serbia]]
|archive-date = 5 March 2016
|archive-url = https://web.archive.org/web/20160305045135/http://www.dmdm.rs/en/Istorijat.php
|url-status = dead
}}</ref>
!scope="row"| Serbia
| [[Obsolete Serbian units of measurement|Serbian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1874
!scope="row"| Hungary
| [[Hungarian units of measurement|Hungarian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="2"| 1875
!scope="row" data-sort-value="Turkey" |Ottoman Empire/Turkey
| [[Ottoman units of measurement|Ottoman]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Norway<ref>{{cite web|url=http://www.regjeringen.no/upload/kilde/nhd/hdk/2004/0012/ddd/pdfv/206273-kap_4.pdf|title=Kapittel 4 : Internasjonale avtaler|publisher=Regjeringen.no|access-date=24 November 2014|archive-date=3 December 2014|archive-url=https://web.archive.org/web/20141203101500/http://www.regjeringen.no/upload/kilde/nhd/hdk/2004/0012/ddd/pdfv/206273-kap_4.pdf|url-status=live}}</ref>
| [[Norwegian units of measurement|Norwegian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="2"| 1876
!scope="row"| [[Metrication in Sweden|Sweden]]
| [[Swedish units of measurement|Swedish]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, the previous unit of length ''[[Scandinavian mile|mil]]'', redefined in 1876 as exactly 10&nbsp;km, is however still in informal everyday use for long or approximate distances
|-
!scope="row"| Switzerland
| [[Swiss units of measurement|Swiss]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1878
!scope="row"| Mauritius
| [[Mauritian units of measurement|Mauritian (English, French)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1886
!scope="row"| Finland<ref>{{cite web |url=http://lamar.colostate.edu/~hillger/internat.htm |title=Metric usage and metrication in other countries |website=USMA |publisher=U.S. Metric Association |access-date=24 November 2014 |url-status=dead |archive-url=https://web.archive.org/web/19990221223050/http://lamar.colostate.edu/~hillger/internat.htm |archive-date=21 February 1999}}</ref>
| [[Finnish units of measurement|Finnish]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1895
!scope="row"| Tunisia
| [[Tunisian units of measurement|Tunisian (Arabic, Turc)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1897
!scope="row"| Madagascar
| [[Malagasy units of measurement|Malagasy]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1899
!scope="row"| Paraguay
| [[Paraguayan units of measurement|Paraguayan (variants of Spanish)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="2"| 1907
!scope="row"| Denmark<ref name="CGPM-4-82">{{cite web
 |url          = http://www.bipm.org/utils/common/pdf/CGPM/CGPM4.pdf#page=82
 |title        = Comptes rendus des séances de la quatrième conférence générale des poids et mesures, pages 82-83
 |date         = 1907
 |publisher    = [[International Bureau of Weights and Measures|BIPM]]
 |language     = fr
 |access-date  = 22 November 2021
 |archive-date = 4 December 2020
 |archive-url  = https://web.archive.org/web/20201204112200/https://www.bipm.org/utils/common/pdf/CGPM/CGPM4.pdf#page=82
 |url-status   = live
}}</ref>
| [[Danish units of measurement|Danish]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Iceland<ref name="CGPM-4-82" />
| [[Icelandic units of measurement|Icelandic]] / [[Danish units of measurement|Danish]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1908
!scope="row"| Costa Rica
| [[Costa Rican units of measurement|Costa Rican (variants of Spanish)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1912
!scope="row"| Dominican Republic
| [[Spanish customary units|Spanish]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1918
!scope="row"| Russia<ref name="SovNarkomDecree">
{{Cite journal
 |journal      = [[:ru:Собрание узаконений РСФСР]]
 |title        = Metric
 |year         = 1918
 |issue        = 66
 |page         = 725
 |language     = ru
}}</ref><ref name="SovietCalendar1920">
{{Cite book
 | url         = https://books.google.com/books?id=cjQkAQAAIAAJ&q=%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F%20%D1%81%D0%B8%D1%81%D1%82%D0%B5%D0%BC%D0%B0&pg=PA8
 | page        = 8
 | year        = 1920
 | script-title=ru:Настольный Советский Календарь
 |trans-title=Desk Soviet Calendar
 | publisher   = The New International Publishing, New York
 | language    = ru
}}</ref>
| [[Obsolete Russian units of measurement|Russian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="3"| 1920
!scope="row"| Poland<ref name="CGPM-6-65" />
| | [[Polish units of measurement|Polish]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Haiti<ref name="CGPM-6-65" />
| [[Haitian units of measurement|Haitian (variants of French)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Greece<ref name="CGPM-6-65" /><br />1959<ref>{{cite web|url=http://www.e-themis.gov.gr/Portal/files/volumes/temp/ΤΟΜΟΣ%205.doc|format=DOC|title=ΕΛΛΗΝΙΚΗ ΔΗΜΟΚΡΑΤΙΑ ΥΠΟΥΡΓΕΙΟ ΕΣΩΤΕΡΙΚΩΝ ΤΜΗΜΑ ΕΚΔΟΣΕΩΝ ΚΑΙ ΓΡΑΜΜΑΤΕΙΑΚΗΣ-ΛΟΓΙΣΤΙΚΗΣ ΕΞΥΠΗΡΕΤΗΣΗΣ : ΔΙΑΡΚΗΣ ΚΩΔΙΚΑΣ ΝΟΜΟΘΕΣΙΑΣ : ΙΔΡΥΤΗΣ – ΔΩΡΗΤΗΣ|website=E-themis.gov.gr|access-date=10 September 2017|archive-date=4 March 2016|archive-url=https://web.archive.org/web/20160304212526/http://www.e-themis.gov.gr/Portal/files/volumes/temp/%CE%A4%CE%9F%CE%9C%CE%9F%CE%A3%205.doc|url-status=dead}}</ref>
| [[Greek units of measurement|Greek]] and [[Ancient Greek units of measurement|Ancient Greek]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="3"| 1923
!scope="row"| Morocco<ref name="CGPM-7-66" />
| [[Moroccan units of measurement|Moroccan (Arabic, Turc)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Iran<ref name="CGPM-7-66" />
| [[Persian units of measurement|Persian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Thailand<ref>{{cite web
 |url          = http://www.nwmc.go.th/history_eng.html
 |title        = History of weights and measures in Thailand.htm
 |date         = April 2004
 |publisher    = Northern Weights and Measures Center (Thailand)
 |access-date  = 26 September 2011
 |quote        = ..."Weights and Measures Act, [[Thai solar calendar#Buddhist Era|B.E.]] 2466" [1923 A.D.] .... [superseded by ] "Weights and Measures Act, B.E. 2542"  ... Government Gazette, Royal Decree Version, Volume 116, Part 29 a, dated 21 April 1999 ... effective since 18 October 1999
 |archive-date = 2 April 2012
 |archive-url  = https://web.archive.org/web/20120402234248/http://www.nwmc.go.th/history_eng.html
 |url-status   = live
}}</ref><ref>{{cite web
 |url          = http://nwmc.go.th/his1.html
 |script-title = th:ประวัติชั่งตวงวัดไทย
 |date         = April 2004
 |publisher    = Northern Weights and Measures Center (Thailand)
 |language     = th
 |access-date   = 26 September 2011
|archive-url  = https://web.archive.org/web/20120402234248/http://nwmc.go.th/his1.html
 |archive-date = 2 April 2012
|url-status   = dead
}}</ref><ref name="CGPM-7-66">{{cite web
 |url          = http://www.bipm.org/utils/common/pdf/CGPM/CGPM7.pdf#page=68
 |title        = Comptes rendus des séances de la septième conférence générale des poids et mesures, pages 66-69
 |date         = 1927
 |publisher    = [[International Bureau of Weights and Measures|BIPM]]
 |language     = fr
 |access-date  = 5 April 2021
 |archive-date = 4 December 2020
 |archive-url  = https://web.archive.org/web/20201204112012/https://www.bipm.org/utils/common/pdf/CGPM/CGPM7.pdf#page=68
 |url-status   = live
}}</ref>
| [[Thai units of measurement|Thai]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1924
!scope="row"| [[Metrication of Japan|Japan]]<ref>{{citation |last=Mitsuo |first=Tamano |contribution=Japan's Transition to the Metric System |contribution-url=https://books.google.com/books?id=dFLL50miMpgC&pg=PA97 |pages=[https://books.google.com/books?id=dFLL50miMpgC&pg=PA97 97–98] |url=https://books.google.com/books?id=dFLL50miMpgC |date=July 1971 |title=US Metric Study Interim Report, ''No. 3:'' Commercial Weights and Measures |series=National Bureau of Standards Special Publication 345-3 |publisher=US Department of Commerce |location=[[Washington, DC|Washington]]}}.</ref><ref name="CGPM-6-65">{{cite web
 |url          = http://www.bipm.org/utils/common/pdf/CGPM/CGPM6.pdf#page=69
 |title        = Comptes rendus des séances de la sixtième conférence générale des poids et mesures, page 65
 |date         = 1921
 |publisher    = [[International Bureau of Weights and Measures|BIPM]]
 |language     = fr
 |access-date  = 5 April 2021
 |archive-date = 4 December 2020
 |archive-url  = https://web.archive.org/web/20201204112030/https://www.bipm.org/utils/common/pdf/CGPM/CGPM6.pdf#page=69
 |url-status   = live
}}</ref>
| [[Japanese units of measurement|Japanese]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, with continued informal use of the [[gō (unit)|gō]] serving size, [[tsubo]] for floorspace.
|-
| 1925s
!scope="row"| China
| [[Chinese units of measurement|Chinese]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric.  Wet markets continue to use ''jin'' ([[catty]]) and ''liang'' for weight, land area is still given in ''[[Mu (area)|mu]]'', and other traditional units (e.g., ''[[Chi (unit)|chi]]'' for length) continue to be used informally in everyday language. The People's Republic of China has defined these units so that conversion factors to SI are simple fractions or whole numbers.  (See the article on [[Chinese units of measurement]] for differences in definitions between the PRC, ROC, and other Sinosphere countries and regions.)    
|-
| 1926
!scope="row"| Afghanistan<ref name="CGPM-7-66" />
| [[Afghan units of measurement|Afghan (Persian, Arab, Indian)]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1929
!scope="row"| Estonia
| [[Estonian units of measurement|Estonian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1946
!scope="row"| Indonesia
| [[Indonesian units of measurement|Indonesian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, however AC units are still measured and advertised in horsepower.<ref>{{cite news |title=Sebelum Pasang AC, Pahami Dulu AC 1 PK Berapa Watt & AC 1/2 PK Berapa Watt! |url=https://artikel.rumah123.com/sebelum-pasang-ac-pahami-dulu-ac-1-pk-berapa-watt-ac-1-2-pk-berapa-watt-52913 |access-date=5 May 2022 |first=Kartika |last=Ratnasari |date=22 March 2022 |work=artikel.rumah123.com |language=id |archive-date=18 May 2022 |archive-url=https://web.archive.org/web/20220518104616/https://artikel.rumah123.com/sebelum-pasang-ac-pahami-dulu-ac-1-pk-berapa-watt-ac-1-2-pk-berapa-watt-52913 |url-status=live }}</ref><ref>{{cite web |title=Definisi PK Dalam AC yang Harus Anda Ketahui |date=21 July 2020 |url=https://cvastro.com/definisi-pk-dalam-ac.htm |access-date=5 May 2022 |publisher=ASTRO |language=id |archive-date=29 May 2022 |archive-url=https://web.archive.org/web/20220529045855/https://cvastro.com/definisi-pk-dalam-ac.htm |url-status=live }}</ref> Informally, floorspace or rural/agrarian land measured differently in each local regions (Sundanese regions tend to use "bata/tumbak", Javanese regions use "ubin/rakit/kesuk/bahu/ru", "rante" in Malay regions, "borong/anggar" in West Kalimantan, "ubin/iring/lupit/tampah" in other regions, etc.).
|-
| 1948
!scope="row"| Israel
| [[Ottoman units of measurement|Ottoman]] and [[Biblical and Talmudic units of measurement|Biblical and Talmudic]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1950
!scope="row"| Somalia
| [[Somali units of measurement|Somali]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="2"| 1954
!scope="row"| [[Metrication in India|India]]
| [[Indian units of measurement|Indian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Sudan
| Sudanese (various)
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1961
!scope="row"| [[Metrication of South Korea|South Korea]]
| [[Korean units|Korean]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, use of the [[pyeong]] of floorspace is still in use.
|-
|rowspan="3"| 1963
!scope="row"| Ethiopia
| [[Ethiopian units of measurement|Ethiopian]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Laos
| Laotian (various)
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
!scope="row"| Vietnam
| [[Vietnamese units of measurement|Vietnamese]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1965
!scope="row"| [[Metrication in the United Kingdom|United Kingdom]]<ref group="Note">Phased transition announced in 1965</ref>
| [[Imperial units|Imperial]]
| bgcolor="#ECCEF2" data-sort-value="3purple" | Metric and Imperial, The metric system is the legislated dominant system of measurement however, Imperial legislation remains for sales of some goods and speed and distance road signs.
|-
|rowspan="2"| 1967
!scope="row"| [[Metrication in Ireland|Ireland]]
| [[Irish units of measurement|Irish]] then [[Irish measure]] prior to 1824, and [[Imperial units|imperial]].
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, however Draught [[beer]] and [[cider]] are required to be sold by [[imperial pint]]; [[troy ounce]] for precious metals also legal.<ref>{{cite ISB |title=European Communities (Units of Measurement) (Amendment) Regulations 2010 |year=2010|type=si|num=89 |access-date=22 January 2019 |date=2 March 2010|signedby=[[Mary Coughlan (politician)|Mary Coughlan]], [[Minister for Enterprise, Trade and Employment]]}}</ref> Floor area is still commonly advertised using square feet. 
|-
!scope="row"| Pakistan
| [[History of measurement systems in Pakistan|Pakistani]] and [[Imperial units|imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1969
!scope="row"| [[Metrication in New Zealand|New Zealand]]
| [[Imperial units|Imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="2"| 1970
!scope="row"| [[Metrication in Australia|Australia]]
| [[Imperial units|Imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, (real estate, especially farmland, above a certain size is still frequently advertised in [[hectare]]s or, somewhat less frequently, [[acre]]s. Human weights were traditionally measured in [[stone (weight)|stones]], and this is still in occasional use by older generations; this however is rapidly dying out.)
|-
!scope="row"| [[Metrication in Canada|Canada]]<ref name="Weights and Measures Act (R.S.C., 1985, c. W-6)">{{cite web
 |url          = http://laws-lois.justice.gc.ca/eng/acts/W-6/
 |title        = Weights and Measures Act
 |year         = 1985
 |work         = Chapter 36 Section 7
 |publisher    = Minister of Justice
 |access-date  = 24 May 2018
 |archive-date = 25 April 2011
 |archive-url  = https://web.archive.org/web/20110425193128/http://laws-lois.justice.gc.ca/eng/acts/W-6/
 |url-status   = live
}}</ref>
| [[Weights and Measures Act (Canada)|Imperial]]
| bgcolor="#ECCEF2" data-sort-value="3purple" |  Metric and Imperial (body measurements are referred to in imperial units, and certain industries such as real estate, construction, and home appliances still use imperial measurements due to a high reliance on American manufacturing.) Metrication was halted in 1985.<ref>{{cite web
 |url=http://www.thecanadianencyclopedia.ca/en/article/metric-conversion/
 |title=Metric Conversion
 |author=Dr. Natarajan Ganapathy
 |year=2009
 |work=Science & Medicine
 |publisher=The Canadian Encyclopedia
 |access-date=11 July 2022
 |archive-date=29 April 2018
 |archive-url=https://web.archive.org/web/20180429220637/http://www.thecanadianencyclopedia.ca/en/article/metric-conversion/
 |url-status=live
 }}</ref>
|-
|rowspan="2"| 1971
!scope="row"| Singapore<ref>{{Cite web |title=Metrication in Singapore |url=https://www.nlb.gov.sg/main/article-detail?cmsuuid=7790f5e5-f6f0-4e1e-800d-88d0509bc5b0 |access-date=9 November 2023 |website=www.nlb.gov.sg |archive-date=9 November 2023 |archive-url=https://web.archive.org/web/20231109110150/https://www.nlb.gov.sg/main/article-detail?cmsuuid=7790f5e5-f6f0-4e1e-800d-88d0509bc5b0 |url-status=live }}</ref>
| [[Malay units of measurement|Malay]] and [[Imperial units|imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, land and property areas are still at times measured with [[square foot]] or [[hectare]].)
|-
!scope="row"| South Africa<ref group="Note">Including South-West Africa, now [[Namibia]]</ref>
| [[South African units of measurement|South African]] and [[Imperial units|imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1972
!scope="row"| Malaysia
| [[Malay units of measurement|Malay]] and [[Imperial units|imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, with some traditional [[wet markets]] and [[pasar pagi]] still using the [[Malay units of measurement|Malay units]]. [[Imperial units]] are widely used such as size of the real estate are often denoted by square feet rather than square metres.
|-
|rowspan="3"| 1975
!scope="row"| [[Metrication in the United States|United States of America]]<ref group="Note">The metric system was lawfully recognized and permitted for all purposes nationwide by the [[Metric Act of 1866]]. The [[Metric Conversion Act]], which established a federal program to facilitate voluntary metrication, was passed in 1975. In 1988, the Metric Conversion Act was amended to officially recognize the SI as “the preferred system of weights and measures for United States trade and commerce”.</ref><ref name="CIA The World Factbook">{{cite web
 |url          = https://www.cia.gov/library/publications/the-world-factbook/appendix/appendix-g.html
 |title        = CIA The World Factbook
 |year         = 2010
 |work         = Appendix G: Weights and Measures
 |publisher    = US Central Intelligence Agency
 |access-date  = 14 August 2013
|archive-date = 6 April 2011
|archive-url  = https://web.archive.org/web/20110406124728/https://www.cia.gov/library/publications/the-world-factbook/appendix/appendix-g.html
 |url-status   = dead
}}</ref>
| [[United States customary units]]
| bgcolor="#ECCEF2" data-sort-value="3purple" | Metric and US customary System. The US customary system remains the dominant system of measurement.
|-
!scope="row"| [[Metrication of North Korea|North Korea]]<ref>{{citation |ref={{harvid|APLMF|2015}} |contribution=DPR Korea |contribution-url=http://www.aplmf.org/dpr-korea.html |title=''Official site'' |url=http://www.aplmf.org/ |publisher=Asia–Pacific Legal Metrology Forum |date=2015 |access-date=6 June 2017 |archive-date=9 February 2017 |archive-url=https://web.archive.org/web/20170209124429/http://www.aplmf.org/ |url-status=live }}.</ref>
| [[Korean units|Korean]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, with formal continued use of [[Korean units|traditional units]]<ref>{{citation |ref={{harvid|DPRK|1993}} |title=''"The Law of the Democratic People's Republic of Korea on Metrology"'' |url=http://www.keikoren.or.jp/measure/20130703-4.pdf |series=No. 484-112 |date=3 February 1993 |publisher=Supreme People's Assembly of the DPRK |location=Pyongyang |access-date=6 June 2017 |archive-date=8 January 2019 |archive-url=https://web.archive.org/web/20190108105032/http://www.keikoren.or.jp/measure/20130703-4.pdf |url-status=dead }}. {{in lang|ko}}{{nbsp}}& {{in lang|en}}</ref><ref>{{citation |ref={{harvid|TEG|2017}} |title=The Economist Intelligence Unit |contribution=North Korea: Summary |contribution-url=http://country.eiu.com/article.aspx?articleid=485115232&Country=North%20Korea&topic=Summary&subtopic=Basic+data |date=10 February 2017 |location=London |publisher=The Economist Group |access-date=6 June 2017 |archive-date=8 August 2020 |archive-url=https://web.archive.org/web/20200808170630/http://country.eiu.com/article.aspx?articleid=485115232&Country=North%20Korea&topic=Summary&subtopic=Basic+data |url-status=live }}.</ref>
|-
!scope="row"| Ghana<ref>{{cite news |title=Ghana Gets Metric System |url=https://www.nytimes.com/1975/09/03/archives/ghana-gets-metric-system.html |work=The New York Times |date=3 September 1975 |access-date=18 October 2019 |archive-date=18 October 2019 |archive-url=https://web.archive.org/web/20191018114735/https://www.nytimes.com/1975/09/03/archives/ghana-gets-metric-system.html |url-status=live }}</ref>
| [[Imperial units|Imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
|rowspan="2"| 1976
!scope="row"| Sri Lanka<ref>{{cite web |url=http://www.commonlii.org/lk/legis/consol_act/nmc189324.pdf |title=Numerical Metric Conversion |website=Commonwealth Legal Information Institute |access-date=10 September 2017 |archive-date=4 March 2016 |archive-url=https://web.archive.org/web/20160304062941/http://www.commonlii.org/lk/legis/consol_act/nmc189324.pdf |url-status=live }}</ref>
| [[Sri Lankan units of measurement|Sri Lankan]] and [[Imperial units|imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric<ref>{{cite web |url=http://archives.dailynews.lk/2006/03/06/main_Letters.asp |title=-- Letters |website=Daily News |location=Cyprus |access-date=10 September 2017 |archive-date=10 January 2014 |archive-url=https://web.archive.org/web/20140110171539/http://archives.dailynews.lk/2006/03/06/main_Letters.asp |url-status=live }}</ref>
|-
!scope="row"| [[Hong Kong units of measurement|Hong Kong]]
| [[Imperial units|Imperial]], [[Chinese units of measurement|Chinese]]
| bgcolor="#CEE6F2" data-sort-value="1blue"  | Metric is the legislated dominant system of measurement, however [[Chinese units of measurement|Chinese units]] and [[imperial units]] are still legal under Weights and Measures Ordinance. The usage of [[Chinese units of measurement|Chinese units]] or [[imperial units]] are still common on fresh food sales (e.g. [[wet markets]]), and real estates still use [[square foot]] as area measurement unit.
|-
| 1984
!scope="row"| Taiwan
| [[Taiwanese units of measurement|Taiwanese]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric (traditional [[wet markets]] and real estate still use [[Taiwanese units of measurement|Taiwanese units]].)
|-
| 1992
!scope="row"| [[Chinese units of measurement#Macau|Macau]]
| [[Imperial units|Imperial]], [[Chinese units of measurement|Chinese]] (also [[United States customary units]])
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| 1998
!scope="row"| [[Metrication in Jamaica|Jamaica]]
| [[Imperial units|Imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, On 10 June 2015, the Jamaican government passed the Road Traffic Bill 2014, which formally repealed and replaced the Road Traffic Act and Regulations 1938. The act included updates to Jamaica's traffic laws along with the use of the metric system within regulatory descriptions. On 18 September 2015, the Jamaican government amended the Weights and Measure Act to include considerable fines to business owners who do not use the metric system.
|-
| 2004
!scope="row"| Trinidad and Tobago
| [[Imperial units|Imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, in 2004 Trinidad and Tobago passed legislation making the International System of Units shall be the primary system of measurement in Trinidad and Tobago in 2015.
|-
| 2005
!scope="row"| Saint Lucia
| [[Imperial units|Imperial]]
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric
|-
| data-sort-value="9999" | Indeterminate
!scope="row"| Liberia<ref group="Note">See also [[Liberia#Measurement system|Liberia measurement system]].</ref>
|[[Imperial units|United States customary units]]<ref name="CIA The World Factbook"/>
| bgcolor="#ECCEF2" data-sort-value="3purple" | Metric and Imperial. The Liberian government has begun transitioning from use of imperial units to the metric system.  However, this change has been gradual, with government reports concurrently using both systems.<ref>{{cite web
 |url=http://trend.ag.utk.edu/international/ReformingCocoaCoffeeMarketingLiberia.pdf 
 |title=Reforming Cocoa and Coffee Marketing in Liberia 
 |first=Michael D. |last=Wilcox, Jr. Department of Agricultural Economics University of Tennessee 
 |year=2008 
 |work=Presentation and Policy Brief 
 |publisher=University of Tennessee 
 |access-date=25 April 2010 |url-status=dead 
 |archive-url=https://web.archive.org/web/20100624032539/http://trend.ag.utk.edu/international/ReformingCocoaCoffeeMarketingLiberia.pdf 
 |archive-date=24 June 2010}}</ref>
|-
| data-sort-value="2013" | 2011<ref group="Note">In June 2011, the Myanmar government's Ministry of Commerce began discussing proposals to reform the measurement system in Myanmar and adopt the metric system used by most of its trading partners.</ref><ref>{{cite news
 | url         = http://www.mmtimes.com/2011/business/584/biz58401.html
 | archive-url  = https://web.archive.org/web/20130528014209/http://www.mmtimes.com/2011/business/584/biz58401.html
 | archive-date = 28 May 2013
| title       = Ditch the viss, govt urges traders
 | author      = Ko Ko Gyi
 | newspaper   = The Myanmar Times
 | date        = 18–24 July 2011
 | access-date  = 14 August 2013
}}</ref><br />2013<ref>{{cite web
|url = http://www.elevenmyanmar.com/national/3684-myanmar-to-adopt-metric-system
|title = Myanmar to adopt metric system
|publisher = [[Eleven Media Group]]
|date = 10 October 2013
|archive-url = https://web.archive.org/web/20131220152124/http://elevenmyanmar.com/national/3684-myanmar-to-adopt-metric-system
|archive-date = 20 December 2013
|url-status = dead
|access-date = 20 April 2015}}</ref><ref>{{cite web |url=https://metricviews.org.uk/2018/02/metric-in-myanmar-an-update/ |title=Metric in Myanmar - an update |date=8 February 2018 |website=Metric Views |publisher=UK Metric Association |access-date=24 February 2020 |archive-url=https://web.archive.org/web/20190619235513/http://metricviews.org.uk/2018/02/metric-in-myanmar-an-update/ |archive-date=19 June 2019 |url-status=dead}}</ref>
!scope="row"| Myanmar
| [[Burmese units of measurement|Burmese]] and [[Imperial units|imperial]]
| bgcolor="#ECCEF2" data-sort-value="3purple" | Metric and Imperial,<ref>{{cite news
 | url         = http://mmtimes.com/index.php/business/property-news/1041-workshop-to-mull-new-weight-and-measurement-standards.htm
 | title       = Workshop to mull new weight and measurement standards
 | author      = Htar Htar Khin
 | newspaper   = The Myanmar Times
 | date        = 20 February 2012
| access-date  = 14 August 2013
}}{{dead link|date=May 2016|bot=medic}}{{cbignore|bot=medic}}</ref>  Announcement of full metrication in 2014, with technical assistance from the [[Physikalisch-Technische Bundesanstalt|German National Metrology Institute]].<ref>{{cite news|url= http://mizzima.com/opinion/features/item/10955-metrication-in-myanmar |title=  Metrication in Myanmar |website= [[Mizzima News]] |first= Nicholas |last= Kohler |date= 3 March 2014 |archive-url= https://web.archive.org/web/20141216042534/http://mizzima.com/opinion/features/item/10955-metrication-in-myanmar |archive-date= 16 December 2014 |url-status= dead | access-date= 20 April 2015}}</ref> Distances and speed limits on road signs are shown in kilometres (per hour), and height clearance signs are shown in metres; fuel is measured and sold in litres; and meteorological data and weather reports are shown in degrees Celsius for temperatures, millimetres for precipitation and kilometres per hour for wind speed.
|-
|2015
!scope="row"|Samoa
|Traditional units
| bgcolor="#CEE6F2" data-sort-value="1blue" | Metric, The Metrology Act 2015 mandates the use of metric/SI units in trade, with a transition period of one year.<ref name="samoa">{{Cite web |url=https://www.mcil.gov.ws/wp-content/uploads/2018/07/Metrology-Act-2015.pdf |title=Metrology Act 2015 |publisher=Ministry of Commerce, Industry and Labour of the Government of Samoa |language=en |date=2016 |accessdate=2024-06-10}}</ref>
|}
'''Notes'''
{{Reflist|group=Note}}