Gallons (US) to Litres Converter (gal to L)
Convert gallons (us) to litres instantly. 1 gal = 3.785 L. Includes the formula, a full conversion table and a calculator that works offline.
The formula
To convert gallons (us) to litres, multiply by 3.785:
L = gal × 3.785Going the other way, divide instead — or multiply by 0.2642, which is the same thing:
gal = L × 0.2642Gallons (US) to Litres conversion table
| Gallons (US) | Litres |
|---|---|
| 1 gal | 3.785 L |
| 2 gal | 7.571 L |
| 3 gal | 11.356 L |
| 4 gal | 15.142 L |
| 5 gal | 18.927 L |
| 6 gal | 22.712 L |
| 7 gal | 26.498 L |
| 8 gal | 30.283 L |
| 9 gal | 34.069 L |
| 10 gal | 37.854 L |
| 15 gal | 56.781 L |
| 20 gal | 75.708 L |
| 25 gal | 94.635 L |
| 30 gal | 113.56 L |
| 40 gal | 151.42 L |
| 50 gal | 189.27 L |
| 75 gal | 283.91 L |
| 100 gal | 378.54 L |
| 250 gal | 946.35 L |
| 500 gal | 1,892.71 L |
| 1000 gal | 3,785.41 L |
Litres to Gallons (US)
| Litres | Gallons (US) |
|---|---|
| 1 L | 0.2642 gal |
| 2 L | 0.5283 gal |
| 3 L | 0.7925 gal |
| 4 L | 1.057 gal |
| 5 L | 1.321 gal |
| 6 L | 1.585 gal |
| 7 L | 1.849 gal |
| 8 L | 2.113 gal |
| 9 L | 2.378 gal |
| 10 L | 2.642 gal |
What that actually looks like
A conversion factor is hard to judge on its own. These are quantities most people already have a feel for, converted for you:
- A car fuel tank holds around 13 gallons — 49.21 L
- A gallon of milk is 1 gallon — 3.785 L
Why both units are still in use
Volume has a hidden complication: the US and imperial systems use the same words for different amounts. A US gallon is 3.785 litres, while an imperial gallon is 4.546 litres — about 20 percent larger. The same is true of pints and fluid ounces. This page uses US measures, which is what recipes and fuel prices mean unless they say otherwise.
Mistakes worth avoiding
Check whether a recipe is American or British before converting. A US cup is 237 ml and an imperial cup is 284 ml, which is enough of a difference to ruin baking. If a recipe lists ounces for a solid ingredient it means weight, not fluid ounces.
The other habit worth breaking is rounding too early. Convert first, round once at the end, and you avoid the drift that turns a small approximation into a visible error by the third calculation.
Doing it in your head
When you only need a rough answer, multiply by 15 and divide by 4 — which lands within 0.9 percent of the true value. Ten gallons (US) works out at roughly 37.5 litres that way, against 37.854 exactly. An estimate is enough for deciding whether something will fit or whether a figure sounds plausible. When the number has to be right — because you are buying, cooking or building to it — use the calculator and let it carry the decimals.
Common questions
How many litres are in one US gallon?
One US gallon equals 3.785 litres. The calculator above handles any value, including decimals and very large numbers, and updates as you type.
Is this an exact conversion?
Yes — this is an exact defined ratio, not an approximation. The table rounds for readability; the calculator does not.
Does this work offline?
Yes. The conversion runs in your browser with no network request, so it works on a plane, in a basement, or on a phone with no signal once the page has loaded.