Gallons to Liters and Liters to Gallons
Two-way converter: turn US gallons into liters or liters into gallons in one step.
Type a value into either field — conversion is instant
About the Gallons ↔ Liters conversion
Gallons appear on fuel economy figures, pools, aquariums and containers — this tool converts them instantly.
The factor: 1 US gallon = 3.785 L. For example, 5 gal = 18.93 L. The converter works both ways automatically — type a value into either field.
Everything is calculated instantly in your browser: no data is sent anywhere and the result appears as you type.
Why this converter
Both directions
Convert gallons to liters and back by typing into either field.
Accurate
Uses the exact factor: 1 US gallon = 3.785 L, no rough rounding.
Nothing to install
Works in the browser on phone and desktop, no sign-up.
FAQ
How much is 1 gal in L?
1 US gallon = 3.785 L. For example, 5 gal = 18.93 L.
How do I convert gallons to liters?
Type the value into the “Gallons” field — the result in liters appears instantly. The reverse works the same way.
Is the converter accurate?
Yes — it uses the internationally accepted factor (1 US gallon = 3.785 L).