Litres to US gallons Converter

How many US gallons are in a litre?

One litre is 0.264172 US gallons. The full conversion is US gallons = litres × 0.2641720524, and going the other way you divide instead of multiply.

A few anchor values worth memorising: 0.264172 gal to the litre, 2.641721 gal to ten, and 26.417205 gal to a hundred. The calculator above handles the rest, including the awkward decimals.

The reference table under the converter lists the values people look up most often, so for a common figure you can read the answer off directly rather than typing anything.

Worked examples

Three worked examples, each multiplying by 0.26417205:

2.5 L × 0.264172 = 0.6604 gal. 25 L × 0.264172 = 6.6043 gal. 250 L × 0.264172 = 66.043 gal.

To reverse any of them, divide instead of multiplying — or use the swap button above, which does the same thing without the arithmetic. Reversing a converted value should return you to exactly what you started with; if it does not, something has been rounded too early.

Doing this conversion in your head

The exact factor is 0.26417205, which nobody multiplies by in their head. It is very close to 3/11, so multiplying by 3 and dividing by 11 lands within 3.24% of the correct answer — accurate enough for anything short of engineering work.

Since the factor is less than one, the number always gets smaller: a litre is larger than a US gallon, so any quantity converts to fewer of them. A result larger than what you started with means the conversion went the wrong way.

That sanity check catches the majority of real conversion errors. Before trusting any converted figure, ask whether the direction of change makes sense — it takes a second and it is the single most effective safeguard there is.

When you need to convert litres to US gallons

Whether you need three decimal places or a rough sense of scale depends entirely on why you are converting, so it is worth being clear about that first.

On the source side, litres measure fuel, drinks, engine capacity and container volumes. On the target side, gallons are fuel purchases, water tank capacities and paint tin sizes in the US. The conversion is essentially a translation between those two worlds — most often because a figure produced in one context has to be understood, submitted or acted on in the other.

Where the converted figure will be cut, dosed, billed or filed, round once at the end rather than at each step. For a rough sense of scale, round freely.

The calculation never touches a server, which is why it is instant and why there is nothing here to sign up for.

What a litre and a US gallon actually are

The litre (L). One cubic decimetre; the everyday metric volume unit.

The US gallon (gal). The US gallon is 3.785 L; the imperial gallon is 4.546 L, about 20% larger.

Both are units of volume, and the relationship between them is fixed by international agreement rather than measured experimentally — which is why the conversion is exact and any rounding you see is in the display, not the arithmetic.

Common mistakes when converting litres to US gallons

Watch out for the US/imperial split. The US gallon is 3.785 litres and the imperial gallon is 4.546 litres — about 20% larger. The fluid ounces differ too: 29.57 ml in the US against 28.41 ml in the UK. This converter uses US customary units, which is what almost all recipes published online assume.

Cups are worse still, because there are three in circulation: the US customary cup at 236.6 ml, the US legal cup at 240 ml used on nutrition labels, and the metric cup at 250 ml used in Australia and New Zealand. For baking, where ratios matter, weighing ingredients in grams sidesteps the whole problem.

For a batch of figures, set the units once and work down the list rather than converting via a third unit — each intermediate step introduces its own rounding.