Fluid ounce

Fluid ounce
A baby bottle in both American and British Imperial fluid ounces
General information
Unit system	Imperial units, US customary units
Unit of	Volume
Symbol	fl oz
Conversions (imperial)
1 imp fl oz in ...	... is equal to ...
SI units	28.41306 mL
US customary units	0.9607599 US fl oz
Conversions (US)
1 US fl oz in ...	... is equal to ...
SI units	29.57353 mL
Imperial units	1.040843 imp fl oz

Look up fluid ounce in Wiktionary, the free dictionary.

A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl., old forms ℥, fl ℥, f℥, ƒ ℥) is a unit of volume (also called capacity) typically used for measuring liquids. The British Imperial, the United States customary, and the United States food labeling fluid ounce are the three that are still in common use, although various definitions have been used throughout history.

An imperial fluid ounce is 1⁄20 of an imperial pint, 1⁄160 of an imperial gallon or exactly 28.4130625 mL.

A US customary fluid ounce is 1⁄16 of a US liquid pint and 1⁄128 of a US liquid gallon or exactly 29.5735295625 mL, making it about 4.08% larger than the imperial fluid ounce.

A US food labeling fluid ounce is exactly 30 mL.