US Legal Cups to US Fluid Ounces (cup (legal) to fl oz)
1 US legal cup equals 8.115365448 US fluid ounces (rounded).
How to convert US legal cups to US fluid ounces
To convert US legal cups to US fluid ounces, multiply the number of US legal cups by 8.115365448. The factor is rounded to 10 significant digits. To go the other way, multiply US fluid ounces by 0.1232230398 (rounded).
US fluid ounces = US legal cups × 8.115365448
Example: 10 US legal cups = 81.15365448 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
US Legal Cup (cup (legal))
Exactly 240 mL, the 'cup' defined by US food-labeling law.
Nutrition labels in the United States do not use the traditional cup. Federal law, tied to FDA labelling rules, defines the legal cup as exactly 240 mL, which is a round metric figure sitting close to the customary cup of 8 US fluid ounces (about 236.6 mL, as NIST lists it). The difference is about 1.4 percent, small enough to matter little for a serving size.
The metric cup of 250 mL, used in Australia, Canada, New Zealand and some other countries, is a separate, slightly larger measure, and the legal cup is about 0.96 of it. Older cups varied far more. The Japanese go was about 180 mL and was legally defined in 1891, the Russian stakan about 246 mL and the Dutch kopje about 150 mL. An 1894 British book described a cup as about 6 imperial fluid ounces. Without a stated standard, a recipe cup can therefore differ noticeably from country to country.
1 US legal cup = 0.24 liters (exactly).
Sources: Wikipedia: Cup (unit); NIST Guide to the SI, Appendix B.8: conversion factors
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 US legal cups (reverse)
- US legal cups to liters
- US legal cups to milliliters
- US legal cups to US gallons
- US legal cups 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.