5 US gallons to liters
5 US gallons = 18.9271 liters
Formula: liters = US gallons x 3.7854
Five US gallons is the classic bucket and water-cooler bottle size, and converting it to liters expresses it in the unit used across most of the world.
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: 5 x 3.7854 = 18.9271 liters.
The reverse is just as direct: 18.9271 liters equals 5 US gallons. 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 5-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? 18.9271 liters converts back to 5 US gallons. For the full breakdown in that direction, see 5 liters to US gallons.
Frequently Asked Questions
How many liters are in 5 US gallons?
5 US gallons holds 18.9271 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.
What is 18.9271 liters back in US gallons?
Converting back gives 5 US gallons, the volume you started with. The unit conversion calculator linked below handles liters and gallons for any amount.
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Disclaimer: This calculator is for informational and educational purposes only. Results are estimates and may not reflect exact values.
Last updated: June 13, 2026