According to Math Open Reference, the volume of a cube is calculated using the following formula: [side (in)] 3. This formula requires you to take a side measurement, convert the measurement to inches, and then multiply the side by itself two times. You need to know the lengths of the sides and their units.
- Take a side measurement
Use a reliable instrument to measure the length of the cube. You only need to measure one side, since the lengths of the cube's edges are all equal.
- Convert the measurement into inches
Convert the measurement of the side into inches, since the volume of the cube should be in cubic inches.
- Multiply the side by itself twice
Using the basic formula for determining the volume of a cube in inches, multiply the inches of the side by itself twice. If the length of the side is S, then the volume is S x S x S. The unit of the resulting figure is cubic inches.