This same definition was used for the imperial quart up until 1824 when the UK re-defined the imperial gallon.Ĭurrent use: The respective versions of the quart are used mainly in the United States and the United Kingdom, though in the UK, the use of the liter is now mandated as a result of metrication. The current definition of the US quart is based on the English wine gallon. History/origin: The quart is based on the gallon, the definition of which has changed throughout history based on the commodity being referenced. In both the UK and the US, the quart is equal to ¼ of its respective gallon. In the UK, the imperial quart is equal to 1.136523. In the US, a liquid quart is equal to approximately 0.946353 liters and a dry quart is equal to approximately 1.101221 liters. Definition: The quart (symbol: qt) is a unit of volume in the United States customary and imperial systems of measurement.
