The liter (metric) and the gallon (US customary) both have exact definitions, making this a precise volume conversion.
How it works
Dividing liters by 3.785411784 gives gallons; multiplying gallons by that same constant gives liters back. Type into either field and the other updates instantly.
What this does not include
This does not include the imperial gallon (used in the UK), which is a different, larger size than the US gallon used here.
How to use this calculator
- Enter a value in either liters or gallons — the other field fills in automatically.
Frequently asked questions
Where is this conversion most commonly needed?
Fuel economy figures, beverage container sizes, and recipe conversion between metric and US-volume sources.
Is a US gallon the same as an imperial gallon?
No — an imperial gallon (used in the UK) is about 20% larger than the US gallon this calculator uses.
Why isn’t the ratio a round number?
Because the liter and the US gallon were defined independently in different measurement systems, not designed to divide evenly into each other.
