Is US gallon same as UK?
Is US gallon same as UK? In the Americas, a gallon is equivalent to 128 fluid ounces or 3.785 liters (American spelling). But in the UK, it's 160 fluid ounces or 4.546 litres (British spelling). You can see the full conversion table of US and UK gallons, ounces and liters/litres here, as well as gallons to cups over here. Why is the US gallon smaller than UK? The Americans had adopted a system where a gallon was comprised of 231 cubic inches of water. As a result, the U.S. gallon is 83.3 per cent of the Imperial gallon; put it...