- How do you calculate a volume?
Whereas the basic formula for the area of a rectangular shape is length × width, the basic formula for volume is length × width × height.

- How do you calculate volume on a calculator?
To find the volume of a box, simply multiply length, width, and height — and you're good to go! For example, if a box is 5×7×2 cm, then the volume of a box is 70 cubic centimeters. For dimensions that are relatively small whole numbers, calculating volume by hand is easy.