US Fluid Ounces
Abbreviation/Symbol:
fl oz
Unit of:
Worldwide use:
US fluid ounces are a common unit of volume measurement used primarily in the United States for liquids such as beverages, cooking ingredients, and personal care products.
Definition:
A US fluid ounce is equivalent to approximately 29.5735 milliliters or 1/128th of a US gallon. The US fluid ounce is part of the US customary system of units, which is based on the British imperial system of units.
Origin:
The US fluid ounce is 1/128 of a US gallon, or 29.5735 milliliters. It descends from the old English wine gallon rather than from the imperial system, and is about 4% bigger than the imperial fluid ounce of 28.4131 milliliters.
Usage context:
A US fluid ounce is 29.57 milliliters, a 128th of a US gallon. US soda cans hold 12 fluid ounces, or 355 milliliters.