The origin of the term fluid ounce as a unit of measure is uncertain, but it may have derived from the Latin phrase fluida uncia, which means fluid ounce. A US food labeling fluid ounce is exactly 30 milliliters.It is equivalent to 29.573 milliliters or 1.0408 UK fluid ounces in the metric system. A US fluid ounce is equal to one sixteenth of a US liquid pint in the US customary system of measurement.It is equivalent to 28.413 milliliters or 0.96076 US fluid ounces in the metric system.

A UK fluid ounce is equal to one twentieth of a UK pint in the imperial system of measurement.However, the size of a fluid ounce varies depending on the type of fluid ounce used: Definition of Fluid OuncesĪ fluid ounce is a unit of volume or capacity in both the imperial and US customary systems of measurement. They are also different from barrel of oil equivalent (BOE), which is a unit of energy based on the approximate energy released by burning one barrel of crude oil. They are also different from liters, which are a larger unit of volume. They are different from ounces, which are a unit of weight or mass. They are also used to measure some dry goods, such as grains, fruits, nuts, etc. Fluid Ounces: A Unit of Volumeįluid ounces are a unit of volume that are used to measure liquids, such as water, milk, oil, wine, etc. Fluid Ounce (fl oz) is a unit of Volume used in Standard system.Ĭup (cup) is a unit of Volume used in Cooking system.

8 fl oz to cups