Gallons to Litres Converter
Convert gallons to litres for either the US or the UK gallon. Type a volume and get litres, quarts, pints, fluid ounces and the other gallon. Swap the units to convert litres to gallons for fuel, water and paint.
Gallons to litres converter
How to use the gallons to litres converter
- Enter the US gallons. Type the number of US gallons you want to convert. Decimals work, and so do fractions entered as decimals.
- Check the units. The converter starts as US gallons to litres. Use the From and To menus to change either unit, or press Swap to reverse them.
- Read the result. The answer appears at the top, with the conversion factor and the same value in other common units underneath.
- Copy or print. Copy the result to paste into a message, or print a clean summary to keep with your plans.
How to convert US gallons to litres
litres = US gallons × 3.785411784
litres = UK (imperial) gallons × 4.54609
US gallons = litres × 0.264172
The US gallon is exactly 231 cubic inches, or 3.785411784 litres. The UK gallon is exactly 4.54609 litres, about 20% larger. If a figure has no country attached, check which gallon it means before you convert, because the difference is large.
Worked examples
A fuel tank. 15 US gallons is 56.781 L, and 15 UK gallons is 68.191 L.
A bucket. 5 US gallons is 18.927 L.
A drum. A 55-gallon drum holds 208.2 L.
Litres to gallons. 10 L is 2.642 US gallons or 2.2 UK gallons.
US gallons to litres table
| US gallons | Litres | UK gallons in litres |
|---|---|---|
| 0.25 | 0.946353 | 1.13652 |
| 0.5 | 1.89271 | 2.27304 |
| 1 | 3.78541 | 4.54609 |
| 2 | 7.57082 | 9.09218 |
| 3 | 11.3562 | 13.6383 |
| 5 | 18.9271 | 22.7304 |
| 10 | 37.8541 | 45.4609 |
| 15 | 56.7812 | 68.1914 |
| 20 | 75.7082 | 90.9218 |
| 25 | 94.6353 | 113.652 |
| 50 | 189.271 | 227.305 |
| 100 | 378.541 | 454.609 |
US gallon versus UK gallon
One UK gallon equals 1.20095 US gallons. That is why a car rated at 30 miles per US gallon is about 36 miles per UK gallon, even though it uses the same fuel. The two gallons also divide differently: a US gallon is 128 fluid ounces, while a UK gallon is 160. Quarts and pints inherit the same split (a US quart is 0.946 L, a UK quart 1.137 L). For paint or pond volumes in gallons, see the pond volume calculator.
Features
- Convert US gallons to litres and back, with a Swap button.
- Other common units shown at once, so you rarely need a second conversion.
- Exact definitions from NIST, with 8 significant digits.
- Copy result, reset and a printable report in five themes on A4 or Letter.
Related converters and calculators
Convert smaller volumes with the ml to fluid ounces converter, tanks with the cubic feet to gallons converter, or size a pond with the pond volume calculator.
Frequently asked questions
How many litres are in a US gallon?
A US gallon is exactly 3.785411784 litres, usually rounded to 3.785.
How many litres are in a UK gallon?
An imperial (UK) gallon is exactly 4.54609 litres.
How do I convert gallons to litres?
Multiply US gallons by 3.785, or UK gallons by 4.546. For 12 US gallons that is 45.42 litres.
How many gallons is a litre?
A litre is 0.264172 US gallons or 0.219969 UK gallons.
What is the difference between US and UK gallons?
The UK gallon is about 20% bigger: 4.546 L against 3.785 L. A US gallon is 128 fluid ounces and a UK gallon is 160 fluid ounces.
How many gallons is 100 litres?
100 litres is 26.42 US gallons or 22.00 UK gallons.
How many quarts are in a gallon?
There are 4 quarts in both the US and UK gallon, but the quarts differ in size. A US quart is 0.946 L and a UK quart is 1.137 L.
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Sources and references
About this calculator
Written and maintained by Rashid Mehmood, founder of CalcTen. The formulas are unit-tested against hand-worked examples, and the content is reviewed whenever product sizes or guidance change. Last updated 14 November 2026. See our editorial policy.
Conversion factors come from NIST and other standards bodies, and results are rounded for display. For safety-critical work such as medicines, engineering or navigation, verify with an authoritative source. Read the disclaimer.