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Units of Measure

How many liters are in an imperial gallon?


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January 31, 2014 4:28PM

One Imperial gallon = 4.546 L

(rounded to the milliliter)

And the exact, legal value is: 1 imperial gallon = 4,546 09 L
It appears that a British Gallon is different from a US gallon. This derives from the fact that where a US pint is 16 fluid ounces, a British pint consists of 20 fluid ounces. There are still 8 pints in a gallon. There are (approximately) 28.8ml in a fluid ounce. There are 160 fluid ounces in a British gallon. There are 128 fluid ounces in a US gallon. Therefore, there are (approximately) 4.6 litres in a British gallon; and (approximately) 3.7 liters (sic) in a US gallon.