This converter turns US gallons into liters instantly, using the exact factor 1 US gallon = 3.785411784 liters. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Exactly 231 cubic inches — the US liquid gallon used for fuel and milk. One cubic decimetre — the everyday metric unit for drinks and fuel.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
US gallons- The amount you are converting, measured in US gallons
3.785411784- The exact number of liters in one US gallon
liters- The converted result
How it works, step by step
- Enter the number of US gallons you want to convert.
- The value is multiplied by 3.785411784, the exact conversion factor.
- The result is displayed in liters, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 US gallons
Multiply 5 by 3.7854118. That gives 18.9271 liters. A quick sanity check: one US gallon is larger than one liter, so the number should get bigger — and it does.
Converting 72 US gallons
72 × 3.7854118 = 272.5496 liters. Working backwards, 272.5496 ÷ 3.7854118 returns 72 US gallons, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many liters are in one US gallon?
Exactly 3.785411784. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert US gallons to liters?
Liters = US gallons × 3.785411784. To reverse it, divide instead: US gallons = liters ÷ 3.785411784, which is the same as multiplying by 0.2641720524.
Is the US gallon bigger than the liter?
Yes. One US gallon equals 3.78541 liters, so it is the larger unit.
Why does my answer differ slightly from other us-gallons to liters converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a US gallon?
Exactly 231 cubic inches — the US liquid gallon used for fuel and milk.
What is a liter?
One cubic decimetre — the everyday metric unit for drinks and fuel.
Us Gallons to liters reference table
| Us Gallons | Liters |
|---|---|
| 0.5 gal | 1.8927 L |
| 1 gal | 3.7854 L |
| 2 gal | 7.5708 L |
| 3 gal | 11.3562 L |
| 5 gal | 18.9271 L |
| 10 gal | 37.8541 L |
| 15 gal | 56.7812 L |
| 20 gal | 75.7082 L |
| 25 gal | 94.6353 L |
| 50 gal | 189.2706 L |
| 75 gal | 283.9059 L |
| 100 gal | 378.5412 L |
| 250 gal | 946.3529 L |
| 500 gal | 1,892.71 L |
| 1000 gal | 3,785.41 L |
Exact factor: 1 US gallon = 3.785411784 liters. Values rounded for display.