In the United States, the U.S. fluid ounce is a unit of
liquid capacity, approximately 29.5735 milliliters.
Symbol, fl oz.
In British imperial measure, the imperial fluid ounce is a
unit of capacity, approximately 28.413 milliliters.
Symbol, fl oz. Symbol used
in pharmacies,
.
It is the volume of 1 avoirdupois ounce of water at 62° F.
One U.S. fluid ounce is 1.041 imperial fluid ounces.
Among other roles, the imperial fluid ounce figured in British apothecaries’ measure.
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Last revised: 28 July 2004.