**For a regular object**, the volume can easily be calculated by measuring length (L), breadth (or width) (b), and height (h).

Volume = Length x Breadth x Height = l x b x h

**For irregular objects**, the volume can be calculated by suspending the object with a thread inside a measuring cylinder half-filled with water. The initial volume of the water V_{1} is noted before suspending the object and the new water level V_{2} is also noted after suspending the object. The difference in water level (V_{2} â€“ V_{1} ) represents the volume of the object.

**For a sphere**, the diameter can be measured using a micrometer screw gauge and the volume determined using the formulae

V = \( \frac {4}{3} \pi r^3\)Â

r = \( \frac {d}{2}\) , d = diameter of the object

For a cone, V = \( \frac {1}{3}\scriptsize \pi r^2 h\)

For a cylinder, V = \( \scriptsize \pi r^2 h\)

The pictures make it easy to understand.