The pint is a longstanding measure of volume used primarily for liquids and some packed foods. It exists in a few different legal forms: the imperial pint used in the United Kingdom and several Commonwealth countries, the United States liquid pint used for most beverages and cooking, and the United States dry pint used historically for some agricultural produce. Each version is tied to its own system of quarts, gallons and fluid ounces and therefore differs in exact size.

Definitions and conversions

In both the imperial and US customary systems a pint is defined as one half of a quart and one eighth of a gallon within that system, but the base sizes of the quart and gallon differ. Commonly cited exact values are:

  • Imperial pint: 568.26125 millilitres (20 imperial fluid ounces)
  • US liquid pint: 473.176473 millilitres (16 US fluid ounces)
  • US dry pint: 550.610471 millilitres (used for some dry goods)

Because the imperial fluid ounce is about 3.9% smaller than the US fluid ounce but the imperial pint contains 20 such ounces (vs. 16 in the US liquid pint), an imperial pint is roughly 20% larger than a US liquid pint. In shorthand the unit is abbreviated "pt." and appears in recipes, packaging and trade descriptions.

History and origin

The pint has medieval origins in Europe and entered English usage via Middle English and Old French terms such as "pinte." Like many traditional measures, local variations developed before national systems standardized sizes in the 18th and 19th centuries. The modern imperial system (established in the 19th century) and the US customary system (derived from older English measures) preserved separate legal definitions, which is why the same name denotes different volumes today.

Common uses and examples

Pints are frequently used for beverages (especially beer and cider), for portions in casual dining, and for selling certain produce such as berries. In the UK a pint glass typically refers to the 20-imperial-fluid-ounce measure, while in the US a pint glass or container usually refers to the 16-US-fluid-ounce quantity. In cooking, recipes sometimes specify a pint; because of the difference between systems it is important to confirm whether a US or imperial pint is intended.

Practical distinctions and notes

  • The same name across systems can cause confusion in international contexts; many recipes and product labels now list metric equivalents (litres or millilitres) to avoid ambiguity.
  • Retail and legal standards may require sellers to indicate volumes explicitly; in some countries certain drinks are commonly sold by the pint as a standard serving size.
  • For dry goods the US dry pint is used in some agricultural contexts, though metric mass or volume measures are increasingly common.

For more on the broader measurement systems that define these values, see Imperial units and United States customary units. Understanding which pint is meant—imperial, US liquid, or US dry—helps avoid errors in cooking, trade, and scientific contexts.