Is a US gallon the same as a UK gallon?

No. A US gallon is 3.78541 L, while an imperial (UK) gallon is 4.54609 L — about 20% larger. This converter uses US gallons.

How many liters in a 5-gallon jug?

A US 5-gallon water jug holds 18.93 L; an imperial 5-gallon jug holds 22.73 L.

Convert liters into US gallons for fuel economy comparisons, aquarium and tank capacities, and reading metric labels in the US.

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From

1 L = 0.26417 gal

US gallons = liters × 0.264172

Is a US gallon the same as a UK gallon?: No. A US gallon is 3.78541 L, while an imperial (UK) gallon is 4.54609 L — about 20% larger. This converter uses US gallons.
How many liters in a 5-gallon jug?: A US 5-gallon water jug holds 18.93 L; an imperial 5-gallon jug holds 22.73 L.