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Gallons to Liters Converter
Convert US liquid gallons to litres with a reference tank, Imperial comparison, related units, common values and batch results.
Live result · exact formula · visual context · batch conversionUS liquid gallons → Litres
One US liquid gallon is exactly 231 cubic inches, or 3.785411784 litres.
Live conversion result
Converted value
Volume reference tank
The fill level compares the converted amount with a 20-litre reference container; it is illustrative, not a container specification.
——Equivalent values in related units
Common real-world values
Choose a useful reference value or enter your own value above.
Conversion table
The table uses useful values for this exact unit pair.
| Starting value (US gal) | Converted value (L) |
|---|
Convert several values at once
Enter values separated by semicolons, spaces or new lines. Up to 50 values are processed at once.
| Starting value (US gal) | Converted value (L) |
|---|
Exact conversion relationship
One US liquid gallon is exactly 231 cubic inches, or 3.785411784 litres.
Where this conversion is useful
Gallons-to-litres conversion is useful for fuel economy, vehicle and boat tanks, aquariums, water storage, appliances and imported product specifications.
Understanding the result
The main conversion uses the US liquid gallon. The imperial gallon is larger; do not mix these two definitions.
Confirm the gallon definition
One US liquid gallon is 3.785411784 litres; one imperial gallon is 4.54609 litres. Check which definition your source uses.
Precision and rounding
The calculator keeps full numerical precision internally and rounds only the displayed values. Match the displayed precision to the accuracy of your original measurement.
Zero is accepted and converts correctly.
Batch conversion for lists and records
Paste a short list to create a clean two-column result table for specifications, logs, planning notes or comparisons.
More quick unit-pair converters
Continue with the reverse direction, another popular pair or the complete category converter.
Gallons to Liters Converter – Frequently asked questions
How do I convert US gallons to litres?
Multiply US liquid gallons by 3.785411784.
How many litres are in one US gallon?
One US liquid gallon equals exactly 3.785411784 litres.
How many litres are in five gallons?
Five US liquid gallons equal approximately 18.9271 litres.
Is this an Imperial-gallon converter?
The main input uses US liquid gallons, but the result panel also shows the Imperial-gallon equivalent.
Can I use this for a fuel tank?
Yes, provided the original specification uses US liquid gallons.
Can I enter a negative amount?
No. Enter zero or a positive physical volume.
Can I convert a list of gallon values?
Yes. The batch tool processes up to 50 entries.
Where can I convert other volume units?
Use the unit cards or open the full Volume Converter.