Conversion

Gallons to Liters Converter

Convert US gallons to liters instantly with a simple, free calculator.

The result shows the same volume expressed in liters, so a quantity given in US gallons can be read, compared, or recorded in liters.

Formula

Liters = Us gallons × 3.78541. Multiply the value in US gallons by 3.78541 to get the value in liters.

How it works

Enter a value in US gallons. The calculator multiplies it by the conversion factor and shows the equivalent in liters, rounded to at most four decimal places so long decimals stay readable. Negative values are converted the same way, since the factor applies in both directions of the scale.

Worked example

For example, 5 US gallons × 3.78541 = 18.9271 liters.

FAQs

How many liters are in 1 US gallons?
One US gallons equals 3.78541 liters. Multiply any value in US gallons by 3.78541 to get liters.

Is this US gallons to liters conversion exact?
This uses the US liquid gallon of 3.78541 liters. A UK gallon is 4.54609 liters, so confirm which gallon applies before using the result.

When would I need a US gallons to liters conversion?
Any time a measurement, label, or instruction is given in US gallons and you need to work, compare, or record it in liters — for example while shopping, travelling, cooking, studying, or planning a project.

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