Convert imperial fluid ounces to us fluid ounces instantly.
Definition: An imperial fluid ounce is one 160th of an imperial gallon, equal to about 28.4131 milliliters.
History/origin: It developed as the small-volume subdivision of the imperial gallon and remained distinct from the US fluid ounce.
Current use: Imperial fluid ounces appear mostly in legacy UK packaging, recipes, and older measurement references.
Definition: The US fluid ounce is a small liquid-volume unit. There are 128 US fl oz in one US gallon, and each fl oz is about 29.57 mL.
History/origin: Fluid ounces separated liquid volume from weight ounces, and the US version kept its relationship to the American gallon.
Current use: US fl oz appears on soda cans, water bottles, shampoo, lotion, medicine, nutrition facts, measuring cups, and American liquid recipes.
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