Convert us gallons to imperial gallons instantly.
Definition: A US gallon is a unit of volume equal to exactly 3.785411784 liters, or 4 US quarts.
History/origin: The US gallon descends from the older English wine gallon that the United States retained after independence, instead of adopting the later imperial gallon.
Current use: US gallons are used in the United States for gasoline, paint, industrial liquids, and larger beverage containers.
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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