When to use this converter
Convert UK gal to L with an explicit conversion factor. Uses the UK imperial gallon definition.
Explore the liquid volume calculators for other questions in this topic. For a related calculation, use the US Fluid Ounces to Millilitres Converter: Convert US liquid fluid ounces into millilitres.
PUTTING IT INTO PRACTICE
UK 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 (UK gal) | 5 |
| Result | 22.73045 L |
- Check the input labels and enter the example values above.
- Apply the relationship: litres = imperial gallons × 4.54609.
- The result is 22.73045 L, rounded for display.
How to interpret your result
Uses the UK imperial gallon definition.
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 uk gallons to litres converter?
Enter value (uk 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 = imperial gallons × 4.54609.
What should I check before using the result?
Uses the UK imperial gallon definition.
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.
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