| Gallons (gal) | Litres (L) |
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To convert US gallons to litres, multiply by 3.78541. One US liquid gallon is defined as exactly 231 cubic inches, which equals 3.785411784 litres:
Note: the UK imperial gallon is larger at 4.54609 L. This converter uses the US liquid gallon.
Useful volume reference points for gallons and litres:
To convert US gallons to litres, multiply the number of gallons by 3.78541. One US liquid gallon is defined as exactly 231 cubic inches, which works out to 3.785411784 litres. For example, 5 gallons = 5 × 3.78541 = 18.927 litres. A standard 10-gallon fish tank holds 37.85 litres.
To go the other way (litres to gallons) divide by 3.78541 (or multiply by 0.264172). For example, 20 litres = 20 × 0.264172 = 5.28 US gallons. Note that the UK/imperial gallon (4.54609 L) is about 20% larger than the US gallon — if you are working with a UK recipe or fuel measurement, use our separate imperial gallons converter.
Gallons are used as a volume unit in the United States for fuel, drinks, and domestic water. Litres are the metric standard used everywhere else. You'll need this conversion when buying fuel in the US and calculating cost per litre, filling fish tanks or pools, reading American recipes or homebrewing guides, comparing vehicle fuel efficiency (miles per gallon vs. litres per 100 km), and understanding US water usage statistics.
One US liquid gallon equals 3.78541 litres. One UK imperial gallon equals 4.54609 litres. These are different units — always check which type of gallon is being used in a recipe or specification.
One litre equals approximately 0.264172 US gallons. To convert litres to gallons, multiply by 0.264172 or divide by 3.78541. For example, 10 litres = 2.642 US gallons.
5 US gallons = 5 × 3.78541 = 18.927 litres. This is a common question for standard water jugs and cooking pots. A 5-gallon bucket holds about 19 litres.
No. A US liquid gallon is 3.78541 litres. A UK (imperial) gallon is 4.54609 litres — about 20% larger. If you are converting fuel prices or UK recipe volumes, make sure you use the correct gallon type.
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