Today marks the 200th anniversary of the end of the traditional ale pint.
On 1 January 1826, the traditional ale gallon of 282 cubic inches was replaced by the smaller imperial gallon; equal to the volume of ten pounds of water. This meant a reduction in the size of a pint of beer, from about 578 ml to about 568 ml.
The new imperial pint also saw the end of the much larger Scottish pint; equal to about 1.7 litres. The imperial gallon replaced a number of different gallons that had hitherto been in use.
Originally scheduled to come into effect on 1 May 1825, the weights and measures of the new imperial system, enacted in the Weights and Measures Act 1824, came into effect 200 years ago today, on 1 January 1826.
The new imperial pint and gallon broke the link between linear and volume measures. Whereas before, the volume of an ale gallon was defined by an exact number of cubic inches, the volume of an imperial gallon had to be determined in a less direct fashion.
Despite the fact that the metric system has been used exclusively for practically all other trade purposes for more than 25 years, 2025 saw the introduction of legislation designed to preserve the pint as the unit of measure for draught beer and cider for years to come, on account of its “traditional” use.
Jonathan Reynolds, 1 April 2025
Ironically, it is the newer imperial pint that legislators have sought to preserve past its sell-by date, not the ale pint with its legacy and tradition dating back to the 15th century.
The imperial pint is an even newer invention than the litre – a measure that politicians seem peculiarly determined to prevent from being allowed to be used for the sale of draught beer well into the future.
References
English ale gallon
https://www.sizes.com/units/gallon_english_ale.htm
Lib Dems block ability of Minister to allow metric measures for draught beer
https://metricviews.uk/2025/04/04/lib-dems-block-ability-of-minister-to-allow-metric-measures-for-draught-beer/
The Product Regulation and Metrology Act 2025
https://bills.parliament.uk/bills/3752
House of Lords debate – 5 March 2025
https://hansard.parliament.uk/lords/2025-03-05/debates/64F82F9F-EC44-42D3-9CC6-7D5A59270654/ProductRegulationAndMetrologyBill(HL)
House of Commons debate – 1 April 2025
https://hansard.parliament.uk/commons/2025-04-01/debates/298723EA-059D-4682-8B74-C64D603A8F20/ProductRegulationAndMetrologyBill(Lords)
David Lammy says British pint ‘safe’ as MPs debate measurement legislation – 1 April 2025
https://www.independent.co.uk/business/david-lammy-says-british-pint-safe-as-mps-debate-measurement-legislation-b2725292.html
British pint to be protected in law as concession leaves Tories flat – 5 March 2025
https://www.standard.co.uk/news/politics/government-tories-british-conservative-liberal-democrats-b1214941.html
The hidden-away bill charting a course back to Europe – No-one wants you to look at the product safety and metrology bill. And there’s a really good reason for that. – 14 February 2025
https://iandunt.substack.com/p/the-hidden-away-bill-charting-a-course
Metric Views 
The UK seems almost as determined to block its progress as the current US administration is seeking to do over here on this side of The Pond. What a dismal aspect to the so-called “special relationship”. Makes me think of the film “Dumb and Dumber”. 😦
Ezra aka punditgi
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Well, where does this lead the American to? Wasn’t the American pint of 473 mL the previous pint before the imperial pint of 568 mL? If those Luddites are so gun-ho in saving the pint, why don’t they revert to pre-imperial measures still in existence in the US?
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Punditgi,
When nations that were once at the very top of the world decline to the bottom, their every attempt to save themselves is to constantly make more and more dumb mistakes accelerating their downfall even further.
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If we go back to 1824, there were two different gallons in use in Great Britain – the ale or beer gallon (4.462 litres) and the wine (or Queen Anne) gallon (3.785 litres) while the Irish gallon was 3.555 litres. It should be noted that under the Act of Union, the Scots were obliged t use English units of measure. It should be noted that there was no standard gallon for milk or water (possibly because the government could not be bothered as neither milk nor water attracted tax. (One wonders how George Stephenson communicated how much water was needed for his Rocket).
It appears that shortly after independence the United States Customs authorities decided to use the Queen Anne gallon for all taxation purposes in the United States, and since it was smaller than the beer or ale gallon, it brought in more tax.
As can be imagined, the use of different gallons on either side of the Atlantic caused many problems and as a result efforts were made to keep the UK and US standard yards and pounds coordinated with each other. This worked more or less, but in 1960 there was 2 parts per million difference between the UK and US yards, so the new International Yard was agreed and defined to be 0.9144 metres exactly. This had little effect in the UK as the only industry that used lengths that were accurate to 6 decimal places was the land surveying industry and they had metricated before the start of the war. The US surveyors had not metricated and some states continued to use the “survey foot” while others switched to the international yard. In the US, the “survey foot” was discontinued for official use on 1 January 2023.
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