A box of cereal has a width of 4 inches, and a length of 8 inches and a height of 12 inches. What is the volume of the box, in cubic inches? A box has a width of 4 inches, a length of 8 inches, and a height of 12 inches. Use the formula V = l w h, where V represents the volume, l represents the length, w represents the width, and h represents the height. inches cubed