1 US gallon to liters
1 US gallon = 3.7854 liters
Formula: liters = US gallons x 3.7854
One US gallon is the everyday American unit for milk, fuel, and paint, and its liter value is needed whenever a US volume has to match metric containers or recipes.
How to Convert US gallons to liters
The US gallon is defined exactly: it equals 231 cubic inches, or precisely 3.785411784 liters. This is the US liquid gallon and is smaller than the imperial gallon used in the United Kingdom.
The formula is liters = US gallons x 3.7854. Multiply your value by the factor: 1 x 3.7854 = 3.7854 liters.
The reverse is just as direct: 3.7854 liters equals 1 US gallon. That symmetry is a quick way to sanity-check any conversion you make.
US gallons to liters Conversion Table
Use this table to read off nearby values at a glance. The highlighted row is the 1-US gallons conversion from this page.
| US gallons | liters |
|---|---|
| 1 | 3.7854 |
| 2 | 7.5708 |
| 3 | 11.3562 |
| 4 | 15.1416 |
| 5 | 18.9271 |
| 6 | 22.7125 |
| 7 | 26.4979 |
| 8 | 30.2833 |
| 9 | 34.0687 |
| 10 | 37.8541 |
Reverse: liters to US gallons
Need to go the other way? 3.7854 liters converts back to 1 US gallon. For the full breakdown in that direction, see 1 liter to US gallons.
Frequently Asked Questions
How many liters are in 1 US gallon?
1 US gallon holds 3.7854 liters. This uses the US liquid gallon, defined as exactly 231 cubic inches, which is 3.785411784 liters.
Is this a US gallon or a UK imperial gallon?
It is the US liquid gallon here. Because the UK imperial gallon is bigger at roughly 4.546 liters, a British measurement gives a different result, so confirm which gallon your source means.
How do I convert 3.7854 liters back to US gallons?
Reverse it and you return to 1 US gallon. The unit conversion calculator linked below switches between liters and gallons for any value.
Convert Any Value
Need a different number or unit? Open the Unit Conversion Calculator to convert volume between any units instantly.
Open the Unit Conversion CalculatorBrowse all unit conversions or open the Unit Conversion Calculator.
Disclaimer: This calculator is for informational and educational purposes only. Results are estimates and may not reflect exact values.
Last updated: June 13, 2026