Gallons to Liters Converter
Convert US liquid gallons to liters instantly using the exact conversion factor. Enter any gallon value to see the liter equivalent, calculation and common conversion examples.
Convert US Gallons to Liters
Enter a volume in US liquid gallons. The converter multiplies your value by 3.785411784 to calculate the equivalent volume in liters.
The calculation uses the US liquid gallon, not the Imperial gallon.
How to Convert Gallons to Liters
The ToolZippy Gallons to Liters Converter converts US liquid gallons into liters. Enter the number of gallons and the equivalent liter value appears immediately.
This page specifically uses the US liquid gallon. That distinction matters because the US gallon and the UK Imperial gallon are different sizes.
Gallons to Liters Formula
One US liquid gallon is exactly 3.785411784 liters. Therefore, to convert US gallons to liters, multiply the gallon value by 3.785411784.
Example: Convert 5 Gallons to Liters
To convert 5 US gallons to liters, multiply 5 by the conversion factor:
Example: Convert 10 Gallons to Liters
Gallons to Liters Conversion Table
The following table shows common US gallon values and their equivalents in liters.
| US Gallons | Liters | Rounded Liters |
|---|---|---|
| 0.5 gal | 1.892705892 L | 1.893 L |
| 1 gal | 3.785411784 L | 3.785 L |
| 2 gal | 7.570823568 L | 7.571 L |
| 5 gal | 18.92705892 L | 18.927 L |
| 10 gal | 37.85411784 L | 37.854 L |
| 20 gal | 75.70823568 L | 75.708 L |
| 50 gal | 189.2705892 L | 189.271 L |
| 100 gal | 378.5411784 L | 378.541 L |
What Is a US Gallon?
A US liquid gallon is a unit of volume used primarily in the United States. One US liquid gallon contains 4 US quarts, 8 US pints or 128 US fluid ounces.
For gallon-to-liter conversion, the important relationship is:
What Is a Liter?
A liter is a metric unit of volume equal to 1,000 milliliters. Liters are widely used for measuring liquids such as fuel, water, beverages and other fluid quantities.
Because liters and US gallons belong to different measurement systems, a conversion factor is required when comparing or transferring measurements between them.
US Gallons vs Imperial Gallons
The word gallon does not always refer to the same volume. A US liquid gallon and an Imperial gallon are different.
| Gallon Type | Equivalent in Liters | Common Context |
|---|---|---|
| US liquid gallon | 3.785411784 L | United States |
| Imperial gallon | 4.54609 L | UK/Imperial measurements |
This ToolZippy page converts US liquid gallons. If your source measurement specifically says Imperial gallons, do not use the US gallon factor.
How to Convert Liters Back to Gallons
For the reverse conversion, divide liters by 3.785411784, or use ToolZippy’s Liters to Gallons Converter.
When Is Gallons to Liters Conversion Useful?
Gallons-to-liters conversion is useful whenever a volume expressed in US customary units needs to be understood or recorded in metric units. Common examples include:
- Converting fuel quantities between gallons and liters.
- Reading vehicle or equipment capacity specifications.
- Comparing tank, container or reservoir volumes.
- Converting water and liquid storage measurements.
- Working with product specifications from different countries.
- Converting measurements for travel or international documentation.
- Checking school, engineering or everyday volume calculations.
How Many Decimal Places Should You Use?
The number of decimal places you need depends on the purpose of the conversion. For everyday estimates, two or three decimal places are usually easy to read. Technical work may require additional precision.
The calculator retains useful precision in its result so you can round the final value according to your own requirement rather than losing precision before the calculation is complete.
Quick Gallon-to-Liter Estimates
Unit note: This converter uses US liquid gallons. Imperial gallons use a different conversion factor. For technical, commercial or regulated measurements, confirm which gallon definition is specified before converting.
Gallons to Liters FAQs
How many liters are in 1 US gallon?
One US liquid gallon equals exactly 3.785411784 liters.
How do I convert gallons to liters?
Multiply the number of US liquid gallons by 3.785411784. For example, 5 gallons × 3.785411784 equals 18.92705892 liters.
How many liters are in 5 gallons?
Five US liquid gallons equal 18.92705892 liters, or approximately 18.927 liters when rounded to three decimal places.
How many liters are in 10 gallons?
Ten US liquid gallons equal 37.85411784 liters, which is approximately 37.854 liters.
How many liters are in 20 gallons?
Twenty US liquid gallons equal 75.70823568 liters, or approximately 75.708 liters.
Are US gallons and UK gallons the same?
No. One US liquid gallon equals 3.785411784 liters, while one Imperial gallon equals 4.54609 liters. This converter uses the US liquid gallon.
Can I enter decimal gallon values?
Yes. You can enter whole numbers or decimal values such as 0.5, 1.25 or 12.75 gallons.
How do I convert liters back to US gallons?
Divide the liter value by 3.785411784. You can also use ToolZippy’s Liters to Gallons Converter for the reverse calculation.
Should I round gallons-to-liters results?
For everyday calculations, two or three decimal places may be sufficient. For technical work, retain the precision required by your application or applicable standard.