Example 1
50 L -> 13.2086 US gal.
Liters to gallons
Type a volume and pick liters, US gallon, or UK gallon. A 50 L tank is 13.2086 US gal. Those are two different volumes behind the same word gallon.
Smaller volumes: milliliters and US fluid ounces. The default gallon in US mode is American, not imperial.
Result
Enter a value. The result shows up here.
How it works
The US liquid gallon is exactly 3.785411784 L, because it is 231 cubic inches at a 25.4 mm inch. On the page 1 US gal is 3.7854 L. The UK imperial gallon is exactly 4.54609 L, 4.5461 L on the page. The ratio is about 1.201, roughly 20% more. A 50 L tank is 13.2086 US gal. A 20 L can is 5.2834 US gal.
A US pump is marked in gallons, while a European tank is in liters. Type 50 and leave liters to US gallon. A 1.5 L bottle is 0.3963 US gal. Five US gallons is 18.9271 L. Fifteen UK gallons is 68.1914 L, a different drum than 15 US gal, 56.7812 L. Ten liters is 2.6417 US gal.
Pick the direction and the gallon kind from the list. US mode starts as US gallon to liters. Metric starts as liter to US gallon. You must pick UK gallon yourself. A comma and a period both work. Typed zero is allowed. A minus is rejected. The switch does not guess Ohio versus Kent and does not rewrite a typed fifty.
Milliliters and US fluid ounces live next door, the same US gallon split by 128. Here it stays liter and gallon. The page does not know density: fuel, milk, and paint share the same volume on the page.
A liter and a cubic decimeter are the same volume. The US dry gallon is not here. US gasoline uses the liquid US gallon. Historic UK milk and beer used the imperial gallon.
Two gallons behind one word is the usual mix-up. Check the label before you compare a 50 L tank with a 15 gal recipe.
How to use
- Type a tank or can volume, for example 50 or 1.5.
- Pick liters to US gallon, US gallon to liters, or a UK gallon pair.
- Click Calculate. 50 L gives 13.2086 US gal. 1 UK gal is 4.5461 L.
- A US gallon is 3.7854 L. Imperial is about 20 percent larger. The header will not pick UK for you.
- For a cup, open milliliters and ounces. Here it stays the gallon.
Formula
1 US gal = 3.785411784 L
1 UK gal = 4.54609 L
A liter = 1 dm³. Dry gallon and fluid ounce are not in this formula.
L plus US gal and UK gal
Here a 50 L tank is 13.2086 US gal. A US gallon is 3.7854 L, a UK gallon 4.5461 L, about 20% more behind the same word gallon.
- US gal
- US liquid gallon, exactly 3.785411784 L. 50 L / 3.7854 ≈ 13.2086. Five US gal is 18.9271 L.
- UK gal
- Imperial gallon, exactly 4.54609 L. 15 UK gal is 68.1914 L, a different barrel than 15 US gal (56.7812 L).
Real-life examples
Example 2
1 US gallon -> 3.7854 L of liquid.
Example 3
1 UK gallon -> 4.5461 L of liquid.
Example 4
1.5 L -> 0.3963 US gal.
Example 5
20 L -> 5.2834 US gal.
Example 6
5 US gal -> 18.9271 L.
Example 7
10 L -> 2.6417 US gal.
Example 8
15 UK gal -> 68.1914 L.
Ways to use this converter
- You convert a liter tank to US gallons before you compare fuel use with a US trip computer.
- You check a 20 L can against an imperial-gallon recipe so you do not mix UK with US.
Frequently asked questions
Which gallon is the default, US or UK?
US mode starts on the American gallon. You must pick imperial UK from the list. They are two volumes.
How many liters is a US gallon exactly?
Exactly 3.785411784 L, 3.7854 L on the page, from 231 cubic inches at a 25.4 mm inch. Liquid US gallon, not dry.
How does the imperial gallon differ?
UK is 4.54609 L, 4.5461 L on the page. US is 3.785411784 L. Imperial is about 20% larger.
Are a liter and a cubic decimeter the same?
Yes. 1 L = 1 dm³. A milliliter is one thousandth of a liter and lives on the ounce page.
What does the header switch do?
On an empty field, metric sets liters to US gallon, and US sets US gallon to liters. It does not pick UK by itself.
Does a negative volume make sense here?
Zero liters is allowed. A minus is usually a typo or a balance computed elsewhere.
How many US gallons are a 20 L can and a 50 L tank?
20 L is 5.2834 US gal. 50 L is 13.2086 US gal. 1.5 L is 0.3963 US gal.
Is this a fuel gallon or a dry gallon?
Liquid US or imperial UK. The US dry gallon is different and is not here. US fuel uses liquid gallons.
Do UK milk and US gasoline share a gallon?
US gasoline uses the US gallon. Historic UK milk and beer used imperial. You pick the kind yourself.
How many liters are 15 UK gal and 5 US gal?
15 UK gal is 68.1914 L. 5 US gal is 18.9271 L. 15 US gal is 56.7812 L.
Knowledge sources
The converter multiplies your number by an SI factor. NIST SP 330 and BIPM define the units, not your reading.
Page updated in 2026.