Volume conversion
US liquid gallon to Liter converter
Convert gal to L instantly, choose the displayed precision, and verify the result with the formula and reference table below.
Liter (L)
Rounded for display only; calculations retain full precision.
Rounding and precision rules
- Convr calculates first and rounds the displayed result only once, at the final step.
- The default is a maximum of 6 decimal places; trailing zeros are removed.
- Very small values that would appear as zero, and values of 10¹² or more, use scientific notation.
- Display precision is not measurement uncertainty. For scientific, engineering, or regulated work, retain only the digits justified by the source measurement.
Practical context
Understanding this conversion
This conversion is common when comparing American fuel economy, tank capacities, paint quantities, and water usage with metric specifications.
Convr labels the unit explicitly as a US liquid gallon. US dry gallons and Imperial gallons are different units and must not be substituted in technical or commercial calculations.
Reviewed August 16, 2026.
Calculation
US liquid gallon to Liter formula
L = gal × 3.785412
Calculations retain full precision and the result is rounded only for display.
Worked example
For 10 gal, the result is 37.854118 L. Substitute 10 gal into the formula to obtain 37.854118 L.
A numerical value expressed in liter is usually larger than the same measurement expressed in us liquid gallon, because 1 gal equals 3.785412 L.
US liquid gallon to Liter reference table
Common values rounded to a maximum of 6 decimal places.
| US liquid gallon (gal) | Liter (L) |
|---|---|
| 1 gal | 3.785412 L |
| 5 gal | 18.927059 L |
| 10 gal | 37.854118 L |
| 50 gal | 189.270589 L |
| 100 gal | 378.541178 L |
Understanding the units
About US liquid gallon and Liter
US liquid gallon (gal)
One us liquid gallon (gal) equals 3.785411784 L, the base relationship used for this volume conversion.
Liter (L)
Liter (L) is the base unit used by Convr for volume calculations.
When this conversion is useful
US liquid gallon to Liter conversion is useful for recipes, beverage quantities, fuel volumes, laboratory measurements, and container capacities. It lets you compare the same volume or capacity across documents, tools, or standards that use different units.
Learn with Convr
Conversion guides
Metric vs Imperial Units: A Practical Comparison
Understand how metric, US customary, and Imperial units differ, where each system is used, and how to convert between them reliably.
Read guide →Everyday conversionsUS Gallons vs Imperial Gallons: What Is the Difference?
Compare US liquid gallons and Imperial gallons, understand their exact liter values, and avoid common fuel and recipe conversion errors.
Read guide →Answers at a glance
Frequently asked questions
Is one US gallon exactly 3.785 liters?
One US liquid gallon is exactly 3.785411784 liters. The shorter value 3.785 is only an approximation.
Is a US gallon the same as a UK gallon?
No. The Imperial gallon used in the United Kingdom is exactly 4.54609 liters and is about 20 percent larger than a US liquid gallon.
How does Convr round US liquid gallon to Liter results?
Convr keeps full numeric precision during the calculation and rounds only the displayed result. The default is a maximum of 6 decimal places, with selectable precision on this page.
Can I convert negative or decimal us liquid gallon values?
Yes. The converter accepts positive, negative, decimal, and scientific-notation values. Negative values are physically meaningful for some scales, such as temperature, but not for every measured quantity.
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