The quart (symbol: qt)[1] is a unit of volume equal to a quarter of a gallon. Three kinds of quarts are currently used: the liquid quart and dry quart of the US customary system and the imperial quart of the British imperial system. All are roughly equal to one liter. It is divided into two pints or (in the US) four cups. Historically, the exact size of the quart has varied with the different values of gallons over time and in reference to different commodities.
| Quart | |
|---|---|
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 qt in ... | ... is equal to ... |
| SI-compatible units | 1.13652 L |
| US customary units | ≈ 1.200950 US qt |
| US customary units | ≈ 69.35486 in3 |
| Conversions (US) | |
| 1 US qt in ... | ... is equal to ... |
| SI-compatible units | ≈ 0.9463529 L |
| Imperial units | ≈ 0.8326742 imp qt |
| Imperial units | 57.75 in3 |
| US dry gallon | ≈ 0.859367 US dry qt |
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,[2] whilst the pint is called chopine.[2]
Since gallons of various sizes have historically been in use, the corresponding quarts have also existed with various sizes.
In the United States, traditional 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 meters. From this definition is derived the metric equivalencies for inches, feet, and miles, area measures, and measures of volume. The US liquid quart equals 57.75 cubic inches, which is exactly equal to 0.946352946 L.[3][4]
| 1 US liquid quart | = | 1⁄4 | US liquid gallons |
| = | 2 | US liquid pints | |
| = | 4 | US liquid cups | |
| = | 8 | US liquid gills | |
| = | 32 | USfluid ounces | |
| = | 57.75 | cubic inches[5] | |
| ≡ | 0.946352946 | liters[4][6] | |
| ≈ | 33.307 | imperial fluid ounces |
In the United States, the dry quart is equal to one quarter of a US dry gallon, or exactly 1.101220942715 L.
| 1 US dry quart | = | 1⁄32 | USbushels |
| = | 1⁄8 | US pecks | |
| = | 1⁄4 | US dry gallons | |
| = | 2 | US dry pints | |
| = | 67.200625 | cubic inches | |
| ≡ | 1.101220942715 | liters[4][6] | |
| ≈ | 38.758 | imperial fluid ounces |
The imperial quart, which is used for both liquid and dry capacity, is equal to one quarter of an imperial gallon, or exactly 1.1365225 liters. In the United Kingdom goods may be sold by the quart if the equivalent metric measure is also given.[7]
| 1 imperial quart | = | 1⁄4 | imperial gallons |
| = | 2 | imperial pints | |
| = | 40 | imperial fluid ounces | |
| ≡ | 1.1365225 | liters[8][a] | |
| ≈ | 69.355 | cubic inches | |
| ≈ | 38.430 | US fluid ounces |
InCanadian French, by federal law, the imperial quart is called pinte.[9][2]
The Winchester quart is an archaic measure,[10] roughly equal to 2 imperial quarts or 2.25 liters. The 2.5 L 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.
The reputed quart was a measure equal to two-thirds of an imperial quart (or one-sixth of an imperial gallon), at about 0.7577 liters, which is very close to one US fifth (0.757 liters).
The reputed quart was previously recognized as a 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.[11][12]
