Free · Unit conversions

Litres to US, Imperial & Dry Gallons

Convert litres and the selected gallon definition, with an additional selectable volume output.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

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Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

One US liquid gallon is exactly 3.785411784 litres. One imperial gallon is exactly 4.54609 litres.

Volume in litres = gallon count × litres per selected gallon

Worked example

Enter these known values and leave the other values blank.

Volume in selected gallon unit
1 US gal
Volume in litres
3.8 L
Volume in another unit
128 US fl oz

Assumptions and limitations

  • Gallon types have different sizes. US liquid is the initial selection; imperial and dry gallons are separate choices.
  • This converts volume only. Converting to mass additionally requires the material density.
  • Signed entries can represent volume differences. Cup and fluid-ounce choices retain their named US, UK or metric definitions.

Common questions

Are US and imperial gallons interchangeable?

No. They have different exact volumes; choose the unit that matches the source measurement.

Does one fluid ounce weigh one ounce?

Not generally. Fluid ounces measure volume, while ordinary ounces measure mass. Density links the two.

References

The US dry gallon uses one eighth of a 2150.42-cubic-inch bushel, replacing the rounded captured volume factor. The US fluid ounce uses one 128th of the exact US liquid gallon, replacing the rounded captured reciprocal factor. The US customary cup uses one sixteenth of the exact US liquid gallon, replacing the rounded captured cup volume. Bookify replaces the captured rounded US gallon with the exact 3.785411784-liter definition. Prices per thousand US gallons use the same exact gallon as the volume inputs.

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