US Fluid Ounces to Imperial Quarts (fl oz to qt (UK))
1 US fluid ounce equals 0.02602106827 imperial quarts (rounded).
How to convert US fluid ounces to imperial quarts
To convert US fluid ounces to imperial quarts, multiply the number of US fluid ounces by 0.02602106827. The factor is rounded to 10 significant digits. To go the other way, multiply imperial quarts by 38.43039762 (rounded).
imperial quarts = US fluid ounces × 0.02602106827
Example: 10 US fluid ounces = 0.2602106827 imperial quarts.
Pints, quarts, gallons and fluid ounces differ between the US and the UK. Units are labeled 'US' or 'imperial' to avoid confusion.
About these units
US Fluid Ounce (fl oz)
One 128th of a US gallon, 29.5735 mL. Not the same as the weight ounce, and about 4% larger than the imperial fluid ounce.
Fluid ounce began as an attempt to link volume to weight: the volume occupied by one ounce of some substance, such as wine in England or water in Scotland. Definitions varied by region and by liquid. When Britain defined its imperial gallon in 1824 as the space of ten pounds of water, the imperial fluid ounce came out so that an ounce of water weighs about one avoirdupois ounce. The US fluid ounce followed a different path and comes from the older wine gallon.
The US fluid ounce is exactly 1/128 of a US gallon, 29.5735295625 milliliters, about 4 percent bigger than the imperial one at 28.4130625 milliliters. American nutrition labels use yet another figure, treating one fluid ounce as 30 milliliters, a convenient rounding for serving sizes. The name is a trap, because a fluid ounce measures space while a weight ounce measures mass. A US fluid ounce of water weighs a bit more than an ounce of weight, while a fluid ounce of honey weighs considerably more.
1 US fluid ounce = 0.02957352956 liters (approximately).
Sources: Wikipedia: Fluid ounce; NIST SP 811, Appendix B.8: conversion factors for volume; 21 CFR 101.9: nutrition labeling household measures
Imperial Quart (qt (UK))
One quarter of an imperial gallon, 1.1365 L (40 imperial fluid ounces).
Quart comes from the Latin quartus, through French quart, and simply means a quarter: one quarter of a gallon. Because gallons of different sizes were in use over the centuries, quarts varied with them. The imperial version descends from the gallon fixed by the Weights and Measures Act 1824, defined by the weight of ten pounds of distilled water, which gave about 4.54 liters.
The modern figure is exact. The imperial gallon is now 4.54609 liters, so the imperial quart is 1.1365225 liters, equal to two imperial pints, eight gills or 40 imperial fluid ounces. British law still lists the quart as a quarter of a gallon among supplementary units. It is about 1.2 US liquid quarts, so recipes and cans from Britain, Canada and the United States can differ by a fifth. Canada's federal law even calls the imperial quart a pinte in French.
1 imperial quart = 1.1365225 liters (exactly).
Sources: Wikipedia: Quart; Wikipedia: Imperial units; UK Weights and Measures Act 1985, Schedule 1
Related conversions
- Imperial quarts to US fluid ounces (reverse)
- US fluid ounces to liters
- US fluid ounces to milliliters
- US fluid ounces to US gallons
- US fluid ounces to US cups
- US fluid ounces to cubic meters
- US fluid ounces to cubic centimeters
- US fluid ounces to US quarts
- US fluid ounces to US pints
- US fluid ounces to US tablespoons
- US fluid ounces to US teaspoons
- US fluid ounces to metric cups
- US fluid ounces to metric tablespoons
- Liters to imperial quarts
- Milliliters to imperial quarts
- US gallons to imperial quarts
- US cups to imperial quarts
See all volume units.