231 cubic inches
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An imperial gallon has a volume of 4.54609 liters or approximately 277.42 cubic inches.
1 Gallon = 128 fluid ounces (volume not weight) That's a US gallon. An Imperial gallon is 160 ounces, but the ounces aren't the same size as US ounces. Nevertheless, an Imperial gallon is larger. Using litres and millilitres to measure volume solves this confusion. (Of course the US doesn't use Imperial gallons, but here in Canada we did prior to going metric.)
There are 16 ounces in a pint and 128 ounces in a gallon.
This depends on the substance you are measuring. If you are measuring water:1 US gallon weighs 3.78541178 kg1 UK (Imperial) gallon weighs 4.54609118 kg
U.S. gallons are different from imperial gallons. 1 Imperial gallon is equal to 4.54609188 litres and 1 US gallon is equal to 3.78541178 litres. Liters on the other hand are the same everywhere. One liter equals 0.26 U.S. gallon or 0.219 Imperial gallon.