We're not going to learn how to find the volume of a regular shape (square, rectangle, etc). We're going to find the volume of an irregular shape. First of all, you need to measure the sizes. Measure the length, width, and height. Now if the length is 8 inches, and the width is 10 inches, you should multiply them together. Then you multiply it with the height. Let's say the height is 9.2 inches, so then you multiply it all together and the volume is 736 inches.