Imperial Quarts to US Fluid Ounces (qt (UK) to fl oz)
1 imperial quart equals 38.43039762 US fluid ounces (rounded).
How to convert imperial quarts to US fluid ounces
To convert imperial quarts to US fluid ounces, multiply the number of imperial quarts by 38.43039762. The factor is rounded to 10 significant digits. To go the other way, multiply US fluid ounces by 0.02602106827 (rounded).
US fluid ounces = imperial quarts × 38.43039762
Example: 10 imperial quarts = 384.3039762 US fluid ounces.
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
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
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
Related conversions
- US fluid ounces to imperial quarts (reverse)
- Imperial quarts to liters
- Imperial quarts to milliliters
- Imperial quarts to US gallons
- Imperial quarts to US cups
- Liters to US fluid ounces
- Milliliters to US fluid ounces
- US gallons to US fluid ounces
- US cups to US fluid ounces
- Cubic meters to US fluid ounces
- Cubic centimeters to US fluid ounces
- US quarts to US fluid ounces
- US pints to US fluid ounces
- US tablespoons to US fluid ounces
- US teaspoons to US fluid ounces
- Metric cups to US fluid ounces
- Metric tablespoons to US fluid ounces
See all volume units.