Converters Explainers
Liters to gallons: check US or Imperial before you convert
Convert liters to gallons and gallons to liters using the right gallon. Compare US and Imperial values, check a simple table, and avoid mixing up cup sizes.
You look up how many litres are in a gallon and find two answers: about 3.79 and about 4.55. Neither is a maths mistake. They refer to different gallons. Before converting a container size or a quantity in a recipe, check which one the original number uses.
US gallons and Imperial gallons are different sizes
This guide uses US liquid gallons and Imperial gallons. A US liquid gallon is exactly 3.785411784 L; an Imperial gallon is exactly 4.54609 L. An Imperial gallon is about 20% larger, so the choice makes a noticeable difference even with small quantities.
If a label or document only says gal, look for a unit definition or ask whoever supplied the figure. The country can be a clue, but it is better to confirm the actual unit than to guess. ToolBarKit lists US gallons and Imperial gallons separately.
Sources: UN Statistics Division: US and UK gallon-to-litre factors (page 5)
Gallons to litres: a quick comparison
The table rounds litres to two decimal places. Notice how the gap grows with the quantity: ten US gallons and ten Imperial gallons differ by more than seven litres.
| Gallons | Litres: US liquid (rounded) | Litres: Imperial (rounded) |
|---|---|---|
| 1 | 3.79 | 4.55 |
| 2 | 7.57 | 9.09 |
| 5 | 18.93 | 22.73 |
| 10 | 37.85 | 45.46 |
To convert litres to gallons, divide
For US liquid gallons, divide litres by 3.785411784. For Imperial gallons, divide litres by 4.54609. A 5 L container therefore holds about 1.32 US gallons or 1.10 Imperial gallons. The container hasn't changed; the units have.
To go the other way, multiply. For example, 2 US gallons × 3.785411784 gives 7.570823568 L. Keep the full factor while calculating, then round the result to the detail you need. Using 3.79 at every step introduces extra rounding.
US liquid gallons = litres ÷ 3.785411784
Imperial gallons = litres ÷ 4.54609
Litres = gallons × the matching gallon sizeFor recipes, check the cup size too
The Volume converter's US cup means the US customary cup, about 236.59 mL. If your recipe defines a cup as 250 mL, use that stated amount directly instead of selecting US cups. A cup is only helpful when you know which measure it means.
Open the converter, enter the number, and choose the full unit names in From and To. Copy the answer with its label so US gal doesn't become an ambiguous gal later. Litres and liters are two spellings of the same unit, and 1 L is 1,000 mL.
Volume alone also doesn't tell you an ingredient's weight. Don't read 250 mL of flour as 250 g. If a recipe gives grams, use a weight measurement or an ingredient-specific conversion.
Open the Volume converter → · Convert grams, kilograms or pounds →
Common questions
Is 4 litres the same as 1 gallon?
No. Four litres is about 1.06 US liquid gallons or 0.88 Imperial gallons. It can be a rough comparison, but it isn't an exact conversion.
Does ToolBarKit convert US dry gallons?
No. The US gallon option is the liquid gallon. If your source says US dry gallon, don't use the liquid-gallon factor.
Sources and further reading
This guide combines the linked references with examples and the current behavior of ToolBarKit’s tools. Published by the ToolBarKit team; external guidance and tool behavior can change.