Gallons (US) to Liters Converter
Convert gallons (us) to liters instantly. Exact factor: 1 gal = 3.785 L.
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Convert gallons (us) to liters
The exact conversion factor is 1 gal = 3.785 L. Type any value and the result updates instantly; the math is shown beneath the board.
Worked by hand
Multiply the gallons (us) value by 3.785 to get liters.
Worked example
- Take 1 gal
- multiply by 3.785
- the result is 3.785 L
How to use it
- Enter your gallons (us)
- Read the liters result
- Check the factor line to verify by hand
Frequently asked questions
How many liters are in one gallons (us)?
Exactly 3.785 L, by the SI/NIST definition.
How do I convert liters back to gallons (us)?
Divide by 3.785 — or use the full converter where both directions are one click.
Is this rounding or exact?
The factor is exact; only the displayed decimals are rounded.