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The quart^[1] is an imperial and US customary unit of volume equal to a quarter of a gallon, two pints, or four cups. 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 litre.

[edit] Definitions and Equivalencies

United States liquid quart

All U.S. length and volume measures are based upon the legal definition of 1 yard as exactly 0.9144 metres. From this is derived the equivalencies for inches, feet, and miles, as well as area measures and measures of volume. The US liquid quart exactly equals 57.75 cubic inches, which is exactly equal to 0.946352946 litres.^[2][3]

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[4]
	=	0.946352946	litres[5][3]
	≈	33.307	imperial fluid ounces

United States dry quart

The US dry quart is equal to 1/32 of a US bushel, exactly 1.101220942715 litres.

1 US dry quart	=	1/32	US bushels
	=	1/4	US dry gallons
	=	2	US dry pints
	=	67.2	cubic inches
	=	1.101220942715	litres[5][3]
	≈	38.758	imperial fluid ounces

Imperial quart

The imperial quart, used for both liquid or dry capacity, is equal to one quarter of an imperial gallon, or exactly 1.1365225 litres.

1 imperial quart	=	1/4	imperial gallons
	=	2	imperial pints
	=	40	imperial fluid ounces
	=	1.1365225	litres[6][7]
	≈	69.355	cubic inches
	≈	38.430	US fluid ounces

[edit] Winchester quart

The Winchester quart is an archaic measure,^[8] 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.

[edit] Notes