231 cubic inches ==
(presumed that you meant cubic inches, which like gallons is a measure of volume, rather than square inches, which is a measure of area) 1 US gallon = 231 Cubic inches
(presuming you meant cubic inches, which like gallons is a measure of volume, rather than square inches, which is a measure of area)
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You don't. Cubic inches is a measure of volume and square inches is a measure of area.
Assuming it is round, (1) convert all measurements to feet. (2) Use the formula for the volume of a cylinder to get the volume in cubic feet. (3) Convert from cubic feet to gallons. As an alternative, you can also convert all measurements to inches, and in the final step, convert from cubic inches to gallons.
You can't convert that. A gallon is a unit of volume; an inch is a unit of length.
Figure the volume in cubic inches and divide by 277.4 to get the number of gallons the container will hold. This is A close approximate formular. Convert the gallons to pints or less if it is a small container.
Convert everything to feet, then use the formula for the volume of a cylinder. Since the answer will be in cubic feet, you'll then have to convert it to gallons.