It depends on what shape the object is for an exact formula. A great way is to use the displacement of water to determine the volume of something. That is how Archimedes did it with the crown. If you need a more specific answer, please let me know!
a square is a 2 dimensional object. It has no depth. In order to have a volume, an object must have a depth. A cube is a 3 dimensional item, like a pepper or pencil or any item you can hold. The volume of the cube is the length of a side, times the width, times the depth(or height)
May 12th, 2015
Here is a website that explains finding the volume of a cube http://www.mathopenref.com/cubevolume.html