Convert US and imperial gallons to litres

Distinguish US gallons, imperial gallons and litres.

Rules reviewed: BS / EN
01

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02

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Informational calculations. Check assumptions, dates and jurisdiction before making a decision.

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How many litres are in a gallon?

There are two gallons: a US gallon is exactly 3.785411784 litres and an imperial gallon, used in the United Kingdom, exactly 4.54609 litres, so 1 US gallon is about 0.8327 imperial gallons. A US gallon holds 128 US fluid ounces. If you are not sure which gallon a label means, check the country of origin, since American instructions use the US gallon.

METHOD

Formula and method

Conversion through a common base unit using the stated factors.