Liters to Gallons Converter

About the Liters to Gallons Converter

Convert litres to gallons and gallons to litres — type in either box and the other updates. A US gallon is exactly 3.785411784 L (231 cubic inches) and an imperial (UK) gallon exactly 4.54609 L, so US gallons = litres ÷ 3.785411784 and imperial gallons = litres ÷ 4.54609. 10 L is 2.64 US gallons or 2.20 imperial gallons.

Under the result you see the other gallon, the same amount in gallons, quarts and pints (10 L = 2 gal 2 qt 1.13 pt in US measure), and cubic metres for big tanks. The price panel turns a price per litre into a price per US or imperial gallon and back, to compare fuel and liquid prices. Printable tables list fuel-tank sizes, water tanks from 100 to 20,000 L, litres from 1 to 100 and gallons from ¼ to 100.

Common uses

• Reading a car’s fuel-tank size, a fuel price or a mileage figure given in the other unit.
• Comparing a price per litre with a price per gallon.
• Sizing water tanks, drums, aquariums and cans sold in litres or gallons.
• Following American or British instructions that give liquids in gallons, quarts or pints.

The formula

NIST Handbook 44, Appendix C gives the US gallon as 231 cubic inches = 3.785 411 784 L exactly, with 4 liquid quarts or 8 liquid pints to the gallon (pp. C-6, C-16 and C-25). Schedule 1 of the UK Weights and Measures Act 1985 defines the imperial gallon as 4.546 09 cubic decimetres (litres), the quart as ¼ gallon and the pint as 0.568 261 25 dm³.

• US gallons = litres ÷ 3.785411784 — 20 L = 5.28 US gal
• litres = US gallons × 3.785411784 — 5 US gal = 18.93 L
• imperial gallons = litres ÷ 4.54609 — 20 L = 4.40 imperial gal

In your head: a US gallon is about 3.8 L and an imperial gallon about 4.5 L, so 1 L is about ¼ US gallon.

US or imperial gallon?

The imperial gallon is 20 % bigger: 1 imperial gallon = 1.20095 US gallons, and its quarts and pints are bigger by the same share (a US pint is 473.18 mL, an imperial pint 568.26 mL). The US gallon is the one in American prices, recipes and specifications; the imperial gallon is the gallon of UK law. When a figure does not say which gallon it means, look at where it comes from — and mind that the fluid ounce goes the other way: a US fluid ounce is about 4 % larger than a UK one.

Prices per litre and per gallon

A price per gallon is the price per litre times the litres in a gallon:

• price per US gallon = price per litre × 3.785411784
• price per imperial gallon = price per litre × 4.54609
• price per litre = price per US gallon ÷ 3.785411784

So 105.50 per litre is 399.36 per US gallon, and 3.50 per US gallon is 0.92 per litre. The panel changes the unit only: to compare prices in two currencies, convert the money first with the Currency Converter.

Limitations

• Gallon means the US liquid gallon or the imperial gallon; the converter does not use US dry measures (dry quarts and pecks).
• Litres and gallons measure volume. To get kilograms you need the liquid’s density — a litre of water has a mass of about 1 kg, a litre of fuel or oil less.
• The price panel converts the unit of a price only; it adds no taxes and changes no currency.
• Conversions are exact; only the display is rounded (10 significant figures, or choose a Precision).

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