quart: see English units of measurement.

The quart is an imperial and US customary unit of volume equal to a quarter of a gallon. Since gallons of various sizes have historically been in use, quarts of various sizes have also existed. Three of these quarts remain in current use, all approximately equal to one liter.

Definitions

United States liquid quart

The US liquid quart is defined as one quarter of a US liquid gallon.

1 US liquid quart	=	1/4	US liquid gallons
=	2	US liquid pints
=	4	US liquid cups
=	32	US fluid ounces
=	57.75	cubic inches
=	0.946352946	litres
≈	33.307	Imperial fluid ounces

United States dry quart

The US dry quart is defined as 1/32 of a US bushel.

1 US dry quart	=	1/32	US bushels
=	1/4	US dry gallons
=	2	US dry pints
=	67.2	cubic inches
=	1.101220942715	litres
≈	38.758	Imperial fluid ounces

Imperial quart

The imperial quart, used for both liquid or dry capacity, is defined as one quarter of an Imperial gallon.

1 imperial quart	=	1/4	Imperial gallons
=	2	Imperial pints
=	40	Imperial fluid ounces
=	1.1365225	litres
≈	69.355	cubic inches
≈	38.430	US fluid ounces

Winchester quart

A Winchester quart is an archaic measure, roughly equal to 2 Imperial quarts or 2.25 litres. The 2.5 litre 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.

Maritimer English

In Maritimer English, a quart refers to a quantity of alcohol measuring approximately 750 mL, called a two-six (26 fluid ounces) in the rest of Canada. This is similar in size to the archaic British wine and spirits measure the "reputed quart", which is imperial quart or ~757.7 ml

Notes and references