Convert us fluid ounces to imperial fluid ounces instantly.
Definition: A US fluid ounce is one 128th of a US gallon, equal to about 29.5735 milliliters.
History/origin: The US fluid ounce came from older English systems and stayed tied to the US gallon after the US and imperial systems diverged.
Current use: US fluid ounces are used on drink cans, nutrition labels, recipes, and personal care products in the United States.
Definition: The imperial fluid ounce is a small British liquid measure. One imperial fl oz is about 28.4131 mL, slightly smaller than the US fluid ounce.
History/origin: After Britain standardized the imperial gallon, its fluid ounce remained a separate volume unit from the American fl oz despite the shared name.
Current use: Imperial fl oz is used in historical UK recipes, old measuring jugs, legacy packaging, brewing notes, and conversions from older British references.
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