On this Wikipedia the language links are at the top of the page across from the article title. English unit of volume equal to a quarter gallon. All are roughly equal to one liter. Historically, the exact size of the quart has varied with quart to oz different values of gallons over time and in reference to different commodities.

Since gallons of various sizes have historically been in use, the corresponding quarts have also existed with various sizes. In the United States, all traditional length and volume measures have been legally standardized for commerce by the international yard and pound agreement of 1959, using the definition of 1 yard being exactly equal to 0. The imperial quart, which is used for both liquid and dry capacity, is equal to one quarter of an imperial gallon, or exactly 1. In the United Kingdom goods may be sold by the quart if the equivalent metric measure is also given. The Winchester quart is an archaic measure, roughly equal to 2 imperial quarts or 2. L bottles in which laboratory chemicals are supplied are sometimes referred to as Winchester quart bottles, although they contain slightly more than a traditional Winchester quart. This has been the exact conversion since the redefinition of the imperial gallon in 1976 in the UK, and in 1964 in Canada.