Gallons to Liters

This calculator converts US gallons to liters for fuel, liquids, tanks, and containers.

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Enter the number of US gallons, including decimals if needed, and read the equivalent volume in liters.

Multiply gallons by 3.785411784. Formula: liters = US gallons × 3.785411784.

Worked example

A 12-gallon fuel tank holds 12 × 3.785411784 = 45.4249 liters. Rounded sensibly, that is 45.42 liters.

Common questions

Does this use US or Imperial gallons?

It uses US liquid gallons. An Imperial gallon equals 4.54609 liters, so check which gallon your source uses before converting.

How many liters are in one US gallon?

One US gallon is exactly 3.785411784 liters. For everyday estimates, 3.785 liters is usually precise enough.

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