| Quart | |
|---|---|
_(3).jpg) One-quart milk jugs (top shelf); half-gallon (two-quart) milk jugs (bottom shelf) | |
| General information | |
| Unit of | Volume |
| Symbol | qt |
| Conversions (imperial) | |
| 1 imp qtin ... | ... is equal to ... |
| SI-compatible units | 1.1365225 L |
| US customary units | ≈ 1.200950 US qt |
| US customary units | ≈ 69.354858 in3 |
| Conversions (US) | |
| 1 US qtin ... | ... is equal to ... |
| SI-compatible units | 0.946352946 L |
| Imperial units | ≈ 0.8326742 imp qt |
| Imperial units | 57.75 in3 |
| US dry quarts | 92400/107521 dry qt |
Thequart (symbol:qt)[1] is aunit of volume equal to a quarter of agallon. Three kinds of quarts are currently used: theliquid quart anddry quart of theUS customary system and theimperial quart of theBritish imperial system. All are roughly equal to oneliter. It is divided into twopints or (in the US) fourcups. Historically, the size of a quart has varied with the different values of gallons over time, and in the case of the dry quart, in reference to different commodities.
The term comes from theLatinquartus (meaning one-quarter) via theFrenchquart. However, although the French wordquart has the same root, it frequently means something entirely different. InCanadian French in particular, the quart is calledpinte,[2] while thepint is calledchopine.[2]
Since gallons of various sizes have historically been in use, the corresponding quarts have also existed with various sizes.
The imperial quart is equal to one-quarter of an imperial gallon of exactly4.54609 L, i.e.1.1365225 L. In the United Kingdom, goods may be sold by the quart if the equivalent metric measure is also given.[3]
| 1 imperial quart | ≡ | 1/4 | imperial gallon |
| ≡ | 2 | imperial pints | |
| ≡ | 8 | imperialgills | |
| ≡ | 40 | imperial fluid ounces | |
| ≡ | 1.1365225 | liters[4][a] | |
| ≈ | 69.354858 | cubic inches | |
| ≈ | 0.3002375 | US gallons | |
| ≈ | 1.20095 | US liquid quarts | |
| ≈ | 2.4019 | US liquid pints | |
| ≈ | 9.6076 | USgills | |
| ≈ | 38.4304 | US fluid ounces | |
| ≈ | 1.0320567 | US dry quarts | |
| ≈ | 2.0641135 | US dry pints |
InCanadian French, by federal law, the imperial quart is calledpinte.[5][2]
In the United States, traditional length and volume measures have been legally standardized for commerce by theinternational yard and pound agreement of 1959, using the definition of 1 yard being 0.9144meters: from this definition the metric equivalents for inches, feet, miles, area measures, and measures of volume are determined. The US liquid quart is equal to one-quarter of a gallon of exactly 231cubic inches, i.e. 57.75 cubic inches or0.946352946 L.[6][7]
| 1 US liquid quart | ≡ | 1/4 | USgallon |
| ≡ | 2 | US liquidpints | |
| ≡ | 4 | UScups | |
| ≡ | 8 | USgills | |
| ≡ | 32 | USfluid ounces | |
| ≡ | 0.946352946 | liters[7][8] | |
| ≡ | 57.75 | cubic inches[9] | |
| ≈ | 0.2081685 | imperial gallons | |
| ≈ | 0.8326742 | imperial quarts | |
| ≈ | 1.6653484 | imperial pints | |
| ≈ | 6.6613935 | imperialgills | |
| ≈ | 33.3069674 | imperial fluid ounces | |
| ≡ | 92400/107521 | US dry quart | |
| ≡ | 177279/107521 | US dry pints |
In the United States, thedry quart is equal to1/32 of a US bushel of exactly 2150.42 cubic inches, i.e. 67.200625 cubic inches or1.101220942715 L.
| 1 US dry quart | ≡ | 1/32 | USbushel |
| ≡ | 1/8 | USpeck | |
| ≡ | 2 | US dry pints | |
| ≡ | 1.101220942715 | liters[7][8] | |
| ≡ | 67.200625 | cubic inches | |
| ≡ | 107521/369600 | US gallon | |
| ≡ | 115121/92400 | US liquid quarts | |
| ≡ | 215121/46200 | US liquid pints | |
| ≡ | 93571/11550 | US gills | |
| ≡ | 371367/5775 | US fluid ounces | |
| ≈ | 0.2422347 | imperial gallons | |
| ≈ | 0.968939 | imperial quarts | |
| ≈ | 1.9378779 | imperial pints | |
| ≈ | 7.7515118 | imperialgills | |
| ≈ | 38.7575589 | imperial fluid ounces |
The Winchester quart is an obsolescent measure:[10] it was originally equal to two imperial quarts (half of an imperial gallon) or exactly2.273045 L, but was later metricated to2.5 L (2.2 imperial quarts). Despite its name, it is unrelated to theWinchester measure.[11]
The 2.5 L bottles in which laboratory chemicals are supplied are sometimes referred to asWinchester quart bottles, although these contain 10% more than a traditional Winchester quart.
The reputed quart was a measure equal to two-thirds of an imperial quart (or one-sixth of an imperial gallon), i.e. exactly 0.7576816 liters: this is only 0.08% larger than oneUS fifth (exactly 0.7570823568 liters).
The reputed quart was previously recognized as the standard size of wine bottle in the United Kingdom, and is only about 1% larger than the current standard wine bottle of 0.75 L.[12][13]
