Volume is a three dimensional measure of space within an object. Below are a variety of objects with the formula for their volume. Volumes are measured in units3.
Cuboid

l × w × h
Prism
 

cross-sectional area × l
Pyramid
 

1/3 l w h
(1/3 × base-area × h )
Cone

1/3 

r2 h
Sphere

4/3

r3
Cylinder
 

 

r2 h