A gallon is a measure of volume, and an inch is a measure of length, so you can't convert one to another. There are 12 inches in a foot. There are 128 fluid ounces in a US gallon.
There are 115.5 cubic inches in a half gallon.
1 dry gallon is 268.8 cubic inches.
One US gallon = 231 cubic inches.
277.4 cubic inches per UK gallon.
231 cubic inches per US gallon.
There are approximately 73,921 cubic inches in a 275 gallon cylinder.
One Imperial gallon = about 277.4 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.
1 gallon of space = 231 cubic inches regardless of what's in the gallon. Even if it's empty.
One US gallon = 231 cubic inches.