Gallons to Liters Converter
A US gallon is 3.785 liters. These are US gallons, which are noticeably smaller than the imperial gallon still used in the UK.
How the math works
liters = US gallons x 3.785411784. A US gallon is defined as 231 cubic inches, and an inch is exactly 2.54 centimeters, so the conversion is exact rather than measured.
Common questions
- How many liters is 5 gallons?
- 18.93 liters. A 5 gallon bucket is the one everybody owns, and 19 liters is close enough for any job you would use it for.
- Is a UK gallon the same as a US gallon?
- No. The imperial gallon is 4.546 liters, about 20 percent larger than the US gallon of 3.785. It is why fuel economy figures look better in British reviews: the same car goes further on a bigger gallon.
- How do I convert miles per gallon to liters per 100 km?
- Divide 235.215 by the mpg figure. At 30 mpg that is 7.8 liters per 100 km. The two scales run opposite ways, so a higher mpg is better and a lower liters-per-100 km is better.
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