You take the length times the width times the depth and that will give you cubic feet. If your pool is round, you would multiply 3.14 (Pi) times the radius squared times the depth of the pool. Then multiply that by 7.48 to give you the approximate number of US gallons.
The problem comes when you have irregular shapes and depths to deal with. The easiest way to work through that is to try and divide the pool into shapes and depths you can deal with. For example, if your pool is rectangular, but 3 feet deep at one end and 6 feet at the other, divide it into two rectangular (or square) shapes using the two different depths, work the formula and then add the two together.
Good luck. More.
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