When to use this converter
Convert US gal to L with an explicit conversion factor. US liquid gallons are smaller than imperial gallons.
Explore the liquid volume calculators for other questions in this topic. For a related calculation, use the Acres to Hectares Converter: Convert acres to ha with an explicit conversion factor.
PUTTING IT INTO PRACTICE
US Gallons to Litres: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Value (US gal) | 5 |
| Result | 18.927059 L |
- Check the input labels and enter the example values above.
- Apply the relationship: litres = US gallons × 3.785411784.
- The result is 18.927059 L, rounded for display.
How to interpret your result
US liquid gallons are smaller than imperial gallons.
US liquid gallons and UK imperial gallons have different definitions. The US dry gallon is another unit and is not substituted. Confirm the convention of a container label before converting.
Frequently asked questions
Why do UK and US gallon results differ?
They use different gallon volumes: 4.54609 litres for imperial and 3.785411784 litres for US liquid gallons.
How do I use the us gallons to litres converter?
Enter value (us gal). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
litres = US gallons × 3.785411784.
What should I check before using the result?
US liquid gallons are smaller than imperial gallons.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see NIST: SI conversion factors ↗. This is a topic reference, not an external review or endorsement of this tool.
Calculators Map editorial process · Updated · Methods and limitations