There are 115.5 cubic inches in a half gallon.
There are 268.8 cubic inches in one dry gallon.
277.4 cubic inches per UK gallon.
231 cubic inches per US gallon.
One US gallon = 231 cubic inches.
Gallons is a liquid measurement and inches is a solid measurement so there is no such thing as inches in a gallon but there is square inches in a gallon which is completely diffrent. Cubic inches measure volume so a gallon would be measured in cubic inches rather than square inches. 231 cubic inches is equal to one gallon. Answer2 The first para in the above answer is confusing because it says "there is square inches in a gallon". Unfortunately, there are NOT square inches in a gallon - they are CUBIC inches (a measure of volume, not area)
One UK gallon equates to 277.42 cubic inches.
There are approximately 231 cubic inches in a gallon of oil.
There are 231 cubic inches in one gallon of water.
One US gallon = 231 cubic inches.
There are 231 cubic inches in 1 gallon of water.
1 US gallon is 231 cubic inches.