US Fluid Ounces to US Legal Cups (fl oz to cup (legal))
1 US fluid ounce equals 0.1232230398 US legal cups (rounded).
How to convert US fluid ounces to US legal cups
To convert US fluid ounces to US legal cups, multiply the number of US fluid ounces by 0.1232230398. The factor is rounded to 10 significant digits. To go the other way, multiply US legal cups by 8.115365448 (rounded).
US legal cups = US fluid ounces × 0.1232230398
Example: 10 US fluid ounces = 1.232230398 US legal cups.
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
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
Related conversions
- US legal cups 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 US legal cups
- Milliliters to US legal cups
- US gallons to US legal cups
- US cups to US legal cups
See all volume units.