US and UK gallons are different sizes. Here is how to convert.
A US gallon is exactly 3.785411784 litres and a UK gallon 4.54609 litres. How to convert litres to gallons, and why the two differ.
By Suraj Kumar3 min read
Gallons, quarts, pints and fluid ounces all come in American and British sizes, and the British ones are bigger, except the fluid ounce.
Two gallons.
The US gallon is 231 cubic inches, exactly 3.785411784 litres. The UK gallon is defined as exactly 4.54609 litres, about a fifth larger. So 10 litres is about 2.64172 US gallons or 2.19969 UK gallons.
Choose which one.
The converter uses US gallons unless you choose UK under More options, or type uk gallon. It says which it read every time.
Pints and quarts.
A US pint is 16 US fluid ounces (about 473 mL) and a UK pint 20 UK fluid ounces (about 568 mL). Quarts are two pints in both.
Further reading
Topics: liters to gallons · gallons to liters · how many liters in a gallon · us gallon · imperial gallon · uk gallon
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