Gallons to Liters Converter

Enter a volume in US gallons to see it in liters and in UK (imperial) gallons.

Updated October 27, 2026

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Formula

liters = US gallons × 3.785411784

UK gallons = US gallons × 3.785411784 ÷ 4.54609

Worked example

5 US gal: 5 × 3.785411784 = 18.927059 L, and 18.927059 ÷ 4.54609 = 4.163371 UK gal.

Conversion table

US gallons	Liters	UK gallons
1	3.785412	0.832674
5	18.927059	4.163371
10	37.854118	8.326742
15	56.781177	12.490113
20	75.708236	16.653484
50	189.270589	41.633709

Frequently asked questions

How many liters is 1 gallon?

One US gallon is exactly 3.785411784 liters, so 5 US gallons is 18.927059 L.

How do I convert gallons to liters?

Multiply the US gallons by 3.785411784. For a 12 gallon tank that is 12 × 3.785411784 = 45.425 L.

Is a UK gallon the same as a US gallon?

No. A UK gallon is 4.54609 L, so 5 US gallons (18.927 L) is only 4.163371 UK gallons.

How do I turn a UK gallon figure into liters?

Multiply UK gallons by 4.54609. This page takes US gallons, so enter the US equivalent or use the liters result directly.

How we calculate

Gallons to Liters Converter

Formula

Worked example

Conversion table

Frequently asked questions

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