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An Imperial gallon is 4.54609 litres and a US gallon is 3.785411784 — a twenty percent gap, and the reason a figure quoted in the wrong one is badly wrong. So this shows both at once rather than asking you to know which was meant.
21.997 gal (imp)
100.000 L converted
21.997
Imperial gallons
26.417
US gallons
20%
The gap
The Canadian and British gallon. About 20% bigger than the American one.
The same gap bites fuel economy: 8 L/100 km is 35.3 mpg Imperial but only 29.4 mpg US. A car advertised at “35 mpg” is a different car depending on which side of the border wrote the number.
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The arithmetic runs in your browser, on your own device, and the answer updates with every keystroke. Nothing is sent anywhere — so there is no record of what you earn, what you owe, or what you are thinking of buying.
One press puts it on your clipboard, ready to paste where you need it. There is no file to download — the result is text, not a document. Nothing is remembered — reload and the fields go back to their defaults, so copy anything you want to keep.