Fluid ounce

Fluid ounce is a unit of volume (also called capacity) typically used for measuring liquids. Various definitions have been used throughout history, but only two are still in common use: the British Imperial and the United States customary fluid ounce.

An imperial fluid ounce is 1/20 of an imperial pint, 1/160 of an imperial gallon or approximately 28.41 ml. A US fluid ounce is 1/16 of a US fluid pint and 1/128 of a US liquid gallon or approximately 29.57 ml, making it about 4.08% larger than the imperial fluid ounce.

Definitions

Imperial fluid ounce

The imperial fluid ounce is a unit of volume in the imperial system of weights and measures. It is equal to 1/20 of an imperial pint, or 1/160 of an imperial gallon. In terms of metric units, the imperial fluid ounce is approximately 28.41 milliliters.

US fluid ounce

The US fluid ounce is a unit of volume in the US system of weights and measures. It is equal to 1/16 of a US fluid pint, or 1/128 of a US liquid gallon. In terms of metric units, the US fluid ounce is approximately 29.57 milliliters.

Usage

The fluid ounce is used in the United Kingdom, the United States, and other countries that use either imperial or US customary units. It is commonly used to measure the volume of liquids such as water, beverages, and medicine.

See also

• Cup
• Pint
• Quart
• Gallon
• Milliliter
• Liter

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