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The former Weights and Measures office in Seven Sisters, London (590 Seven Sisters Road). The imperial system of units, imperial system or imperial units (also known as British Imperial [1] or Exchequer Standards of 1826) is the system of units first defined in the British Weights and Measures Act 1824 and continued to be developed through a series of Weights and Measures Acts and amendments.
The US Customary system of units makes use of set of dry units of capacity that have a similar set of names [Note 7] to those of liquid capacity, though different volumes: the dry pint having a volume of 33.6 cubic inches (550 ml) against the US fluid pint's volume of 28.875 cubic inches (473 ml) and the imperial pint of 34.68 cubic inches (568 ...
After four of the British provinces united in the Canadian Confederation in 1867, Canada legally adopted the British imperial system of measure in 1873. [16] In 1873, the French Canadian pinte was defined as being one imperial quart or two imperial pints, while the imperial pint was legally called a chopine in French Canada. While the imperial ...
In 1965, the UK began an official programme of metrication, and as of 2025, in the United Kingdom the metric is the official measurement system for all regulated trading by weight or measure purposes, however imperial pint remains the sole legal unit for milk in returnable bottles and for draught beer and cider in British pubs.
Weights and Measures (Metric System) Act 1897 (60 & 61 Vict. c. 46) [86] An Act to legalise the Use of Weights and Measures of the Metric System. Weights and Measures Acts of 1878 to 1893 was the collective title of the following Acts: [87] Weights and Measures Act 1878 (41 & 42 Vict. c 49) Weights and Measures Act 1889 (52 & 53 Vict. c 21)
The British imperial system uses a stone of 14 lb, a long hundredweight of 112 lb and a long ton of 2,240 lb. The stone is not a measurement of weight used in the US. The US customary system uses the short hundredweight of 100 lb and short ton of 2,000 lb. Where these systems most notably differ is in their units of volume.
Both the imperial and US fluid gallon are divided into 4 quarts, 8 pints or 32 gills. [d] However, whereas the US gill is divided into four US fluid ounces, the imperial gill is divided into five imperial fluid ounces. Thus, while the imperial fluid ounce is 3.924% smaller than the US fluid ounce, the imperial gallon, quart, pint and gill are ...
Metrication in Ireland began in the 1970s and by 2005 was completed, with the main exception being that the imperial pint (568 ml) is still used in eateries and pubs for reasons of tradition. The phrase a "glass of beer" is a colloquial expression for a half-pint (284 ml). [3] All other loose goods sold by volume must be sold using metric units ...