US Gallons to LitersFree online conversion calculator — instant results, no sign-up
Convert US gallons to liters and back.
Sign in to save results and favorites.
About the US Gallons to Liters
The US Gallons to Liters calculator converts US liquid gallons into liters and shows the reverse conversion relationship. Its default input of 1 US gallon produces 3.785412 liters. This tool uses the US liquid gallon, not the Imperial gallon or US dry gallon.
- Value in US gallons (US gallons)
- Enter the volume in US liquid gallons, with a default value of 1.
Formula and method
L = G × 3.785411784; reverse conversion: G = L ÷ 3.785411784. Rounded to six decimal places: 1 US gallon = 3.785412 liters and 1 liter = 0.264172 US gallons.
- GVolume in US liquid gallons.
- LVolume in liters.
Multiply the entered US gallon value by 3.785411784 liters per US liquid gallon, then round the displayed result to six decimal places. For the default input of 1, this gives liters = 3.785412. To convert liters back to US gallons, divide the liter value by the same conversion factor.
Worked example
These are the calculator's starting values and the results it actually produces for them.
Inputs
- Value in US gallons1 US gallons
Results
- liters3.785412
- 1 US gallons =3.785412 liters
- 1 liters =0.264172 US gallons
How to use the US Gallons to Liters
- 1Confirm that your starting volume is measured in US liquid gallons rather than Imperial or US dry gallons.
- 2Enter the volume in the Value in US gallons (US gallons) field, or leave the default value of 1.
- 3Read the calculated liters output; the default input gives 3.785412.
- 4Check the forward conversion row, which shows 1 US gallons = = 3.785412 liters for the default input.
- 5Use the reverse reference row, 1 liters = = 0.264172 US gallons, to understand the liters-to-US-gallons relationship.
Reading your result
The 'liters = 3.785412' output is the converted volume for the default input. The '1 US gallons = = 3.785412 liters' row expresses that same result as an equality. The '1 liters = = 0.264172 US gallons' row gives the reverse unit relationship; it is a per-liter reference, not the conversion back of the entire 3.785412-liter result. The repeated equals signs in the displayed rows should be read as a single equality.
Limitations
The conversion applies only to US liquid gallons. Displayed values are rounded to six decimal places, so using the displayed reverse factor may introduce small rounding differences. The conversion changes units only: it does not account for temperature-related changes in a liquid's volume or convert volume into mass. The listed input accepts US gallons; the reverse relationship does not imply that a separate liters input is available.
Common questions
Why does 1 US gallon produce 3.785412 liters?+
A US liquid gallon is exactly 3.785411784 liters. Rounding that value to six decimal places gives the displayed result of 3.785412 liters.
Can I use this calculator for Imperial gallons?+
No. Imperial gallons and US liquid gallons are different units. This calculator uses the US liquid gallon conversion factor, so an Imperial gallon value must first be converted to US liquid gallons or handled by an Imperial-gallon converter.
How do I convert liters back into US gallons?+
Divide the volume in liters by 3.785411784. The reverse reference row shows that 1 liter equals 0.264172 US gallons when rounded to six decimal places.
Does the US-gallon-to-liter factor change for water, gasoline, or milk?+
No. US gallons and liters both measure volume, so their conversion factor is the same for every substance. Density is needed only if you also want to convert that volume into mass.
Does the calculator save my information?+
Calculations run in your browser. While signed in, inputs and results are automatically recorded in account history; saving a result creates a separate saved record.
Further reading
You might also like
Liters to US Gallons
Convert liters to US gallons and back.
Cups to Milliliters
Convert US cups to milliliters and back.
Milliliters to Cups
Convert milliliters to US cups and back.
Tablespoons to Milliliters
Convert tablespoons to milliliters and back.
Teaspoons to Milliliters
Convert teaspoons to milliliters and back.
Fluid Ounces to Milliliters
Convert US fluid ounces to milliliters and back.
Results are estimates for informational purposes and are not financial, medical or legal advice.