Convert imperial fluid ounces to imperial gallons 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 imperial gallon is the British gallon standard. It is larger than the US gallon and is defined as exactly 4.54609 L.
History/origin: Britain's 1824 imperial reform created one official gallon standard, replacing older gallon variants used for wine, ale, corn, and other goods.
Current use: Imperial gal is seen in older UK records, Commonwealth references, fuel-economy figures, brewing history, marine contexts, and legacy product specifications.
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