Fluid ounce

	Email		Print
	Bookmark		Link

Fluid ounce

A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl.) is a unit of volume

Volume

The volume of any solid, liquid, plasma, vacuum or theoretical object is how much three-dimensional space it occupies, often quantified numerically....
in both the imperial

Imperial unit

Imperial units or the imperial system is a system of units, first defined in the British Weights and Measures Act of 1824, later refined and reduced....
and the US customary

United States customary units

The United States Customary System for units of measurement, also known in the United States as English, Imperial or standard units, is the primary and most commonly-used system of units of measurement in the United States....
systems. It is common to refer to the unit simply as an ounce, especially in cases where no confusion with the unit of mass (also called an ounce) is likely to occur.

rial fluid ounce

The imperial fluid ounce is of an imperial gallon

Gallon

A gallon is a measure of volume of approximately four litres. Historically it has had many different definitions, but there are three definitions in current use....
making it very nearly the volume occupied by one avoirdupois

Avoirdupois

The avoirdupois system is a system of Units of measurement based on a pound of sixteen ounces. It is the everyday system of weight used in the United States....
ounce

Ounce

This article is about the unit of mass. For the unit of force, see Pound-force. For the unit of volume, see Fluid ounce. For all other uses, see Ounce ....
of water.

1/20

imperial pint

Pint

The pint is an English unit of volume or capacity in the imperial unit and United States customary units. The imperial version is 20 imperial fluid ounces and is equivalent to 568 mL, while the U.S....
s

1/5

imperial gills

Gill (unit)

The gill is a unit of measurement for volume equal to a quarter of a pint. It is no longer in common use, except in regard to the volume of alcoholic spirits measures but it is also kept alive by the occasional reference, such as in the cumulative song "The Barley Mow."...

imperial fluid drams

28.4130625

millilitres (exactly) (cc

Cubic centimetre

A cubic centimetre or cubic centimeter is a commonly used unit of volume extending the derived International System of Units-unit cubic metre and corresponds to the volume of a cube measuring 1?1?1 cm....
)

1.733871455

cubic inches

0.960759940

U.S.

Discussion

Ask a question about 'Fluid ounce'

Start a new discussion about 'Fluid ounce'

Answer questions from other users

Full Discussion Forum

Encyclopedia

A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl.) is a unit of volume

Volume

The volume of any solid, liquid, plasma, vacuum or theoretical object is how much three-dimensional space it occupies, often quantified numerically....
in both the imperial

Imperial unit

Imperial units or the imperial system is a system of units, first defined in the British Weights and Measures Act of 1824, later refined and reduced....
and the US customary

United States customary units

Definitions

Imperial fluid ounce

The imperial fluid ounce is of an imperial gallon

Gallon

Avoirdupois

The avoirdupois system is a system of Units of measurement based on a pound of sixteen ounces. It is the everyday system of weight used in the United States....
ounce

Ounce

This article is about the unit of mass. For the unit of force, see Pound-force. For the unit of volume, see Fluid ounce. For all other uses, see Ounce ....
of water.

1 imperial fluid ounce	=	1/160	imperial gallons
=	1/20	imperial pint Pint The pint is an English unit of volume or capacity in the imperial unit and United States customary units. The imperial version is 20 imperial fluid ounces and is equivalent to 568 mL, while the U.S.... s
=	1/5	imperial gills Gill (unit) The gill is a unit of measurement for volume equal to a quarter of a pint. It is no longer in common use, except in regard to the volume of alcoholic spirits measures but it is also kept alive by the occasional reference, such as in the cumulative song "The Barley Mow."...
=	8	imperial fluid drams
=	28.4130625	millilitres (exactly) (cc Cubic centimetre A cubic centimetre or cubic centimeter is a commonly used unit of volume extending the derived International System of Units-unit cubic metre and corresponds to the volume of a cube measuring 1?1?1 cm.... )
˜	1.733871455	cubic inches
˜	0.960759940	U.S. fluid ounces

U.S. customary fluid ounce

The U.S. customary fluid ounce is defined to be of a U.S. gallon. This volume of cool, pure water weighs about 1.04 avoirdupois ounces (29.5 g).

1 U.S. fluid ounce	=	1/128	U.S. gallon
=	1/16	U.S. pints
=	1/8	U.S. cup
=	1/4	U.S. gills
=	8	U.S. fluid drams
=	1.80468754	cubic inches (exactly)
=	29.5735295625	millilitres (exactly) (cc)
˜	1.040842731	imperial fluid ounces

U.S. food labeling fluid ounce

U.S. regulation 21 CFR 101.9(b)(5)(viii) also defines a fluid ounce as exactly 30 millilitres, but this is for use in nutrition labeling only. This is not meant to concur with the customary US definition exactly but is a common source of confusion.

30 millilitres	˜	1.055852392	imperial fluid ounces
˜	1.014420681	U.S. customary fluid ounces
˜	1.830712323	cubic inches

Other useful conversions

Given the definitions above, the number of US fluid ounces in one liter is:

1/29.5735295625 × 1000 = 33.8140

There are thus about 34 customary US fluid ounces in one liter.

Similarly, there are exactly 33 1/3 US food-labeling fluid ounces in a liter.