The quart is a unit of volume (for either the imperial or United States customary units) equal to a quarter of a gallon (hence the name quart), two pints, or four cups. Since gallons of various sizes have historically been in use, quarts of various sizes have also existed; see gallon for further discussion. Three of these kinds of quarts remain in current use, all approximately equal to one litre. Its proper abbreviation is qt.
Definitions and equivalencies
United States liquid quart
All traditional U.S. 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 0.9144 meter. From this definition is derived the metric equivalencies for inches, feet, and miles; as well as area measures; and measures of volume. The US liquid quart equals 57.75 cubic inches, which is exactly equal to 0.946352946 litres.
|1 US liquid quart||=||1/4||US liquid gallons|
|=||2||US liquid pints|
|=||4||US liquid cups|
|=||8||US liquid gills|
|=||32||US fluid ounces|
|≈||33.||imperial fluid ounces|
United States dry quart
The US dry quart is equal to 1/4 of a US dry gallon, exactly 1.101220942715 litres.
|1 US dry quart||=||1/32||US bushels|
|=||1/4||US dry gallons|
|=||2||US dry pints|
|≈||38.758||imperial fluid ounces|
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|
|=||40||imperial fluid ounces|
|≈||38.430||US fluid ounces|
The 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.
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- The term comes from the Latin quartus (meaning one-quarter) via the French quart. However, although the French word quart has the same root, it frequently means something entirely different. In Canadian French in particular, the quart is called pinte whilst the pint is called chopine.
- Daily Language Review - 6th grade level
- Authorized tables, U.S. Code, Title 15, ch. 6, subchapter I, sec. 205, accessed 19 July 2008.
- Guide for the Use of the International System of Units (SI)—US government publication
- One US liquid gallon is defined as 231 cubic inches.
- This has been the exact conversion since the 1964 redefinition of the litre and the 1959 redefinition of the inch.
- This has been the exact conversion since the redefinition of the imperial gallon in 1985 (UK), c. 1964 (Canada).
- Official text of the Units of Measurement Regulations 1995 as originally enacted or made within the United Kingdom, from the UK Statute Law Database Last accessed:3 May 2011
- Measurement Canada
- Mesures Canada
- Trading Standards - Weights and Measures of the City of Winchester