Gallons (US) to Liters Converter
Enter a value in US gallons to convert it to liters — 1 gal = 3.7854 L.
Reviewed by the ToolNestr Editorial Team — July 2026
How to convert US gallons to liters
Converting US gallons to liters is a simple multiplication: take your volume in US gallons and multiply by the fixed conversion factor of 3.785411784 to get liters. Because the factor never changes, the same calculation works for any value, from tiny amounts to very large ones. The converter above applies it the moment you type, with no rounding errors in the underlying maths.
Convert US gallons of fuel, water or paint into the liters used on most labels and pumps. Knowing how to move between US gallons and liters is useful whenever measurements are given in one system but you need them in the other — for shopping, travel, study, cooking, engineering or simply comparing figures from different countries.
The reference table below lists common US gallons values already converted to liters, so you can read off everyday amounts at a glance without typing. For the opposite direction, use the Liters to Gallons Converter, which reverses the calculation exactly.
The formula and a worked example
Formula
L = gal × 3.785411784
Worked example
To convert 10 US gallons: 10 × 3.785411784 = 37.8541 L. To convert 25 US gallons: 25 × 3.785411784 = 94.6353 L.
Gallons (US) to Liters conversion table
| Gallons (gal) | Liters (L) |
|---|---|
| 1 | 3.7854 |
| 2 | 7.5708 |
| 5 | 18.9271 |
| 10 | 37.8541 |
| 25 | 94.6353 |
| 50 | 189.2706 |
| 100 | 378.5412 |
| 250 | 946.3529 |
| 500 | 1,892.7059 |
| 1,000 | 3,785.4118 |
Values are rounded for display; the converter above keeps full precision.
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Frequently asked questions
How do I convert US gallons to liters?
Multiply the number of US gallons by 3.785411784. For example, 10 gal × 3.785411784 = 37.8541 L. The converter above does this automatically.
How many liters are in one US gallons?
There are 3.7854 liters in one US gallons. Multiply by 3.785411784 for any amount.
Is this Gallons (US) to Liters converter accurate?
Yes. It uses the exact conversion factor of 3.785411784, so results are precise. Values shown in the table are rounded for readability.
How do I convert liters back to US gallons?
Use our Liters to Gallons Converter for the reverse direction, or divide the liters value by 3.785411784.