Gallon to Liter Calculator
Enter a value in US gallons to convert it to liters.
Gallon to Liter Formula
To convert US gallons to liters, multiply the gallon value by 3.78541.
Formula: liters = gallons × 3.78541
For example, 5 gallons equals 18.93 liters.
Common Gallon to Liter Conversions
| Gallons | Liters |
|---|---|
| 1 gal | 3.79 L |
| 2 gal | 7.57 L |
| 5 gal | 18.93 L |
| 10 gal | 37.85 L |
| 20 gal | 75.71 L |
Why Convert Gallons to Liters?
This conversion is useful for fuel comparisons, liquid storage, recipes, and product labeling when you work between US customary and metric units.
For smaller volume conversions, you can also use our cm3 to Liter and dm3 to Liter pages.
It is especially handy in travel, retail, and automotive contexts where one country describes fuel or liquid volume in gallons while another expects liters on labels, receipts, or technical documents.
Gallon to Liter FAQ
What is the formula for gallon to liter?
The formula is liters = gallons × 3.78541 for US gallons.
Is this using US gallons or UK gallons?
This page uses the US liquid gallon, which is the standard unit behind most US-based gallon searches and fuel comparisons.
How many liters are in 1 gallon?
1 US gallon equals about 3.78541 liters.