How many inches is a volleyball?

Question

how many inches & millimeters is the (height) of the average volleyball?

Answer 1

The circumference is 65 to 67 cm, which is 25.6 to 26.4 inches.  

That would make it roughly 21 cm in radius or 42 cm high.  In inches, it would be a radius of roughly 8 1/4 inches or a height of 16 1/2 inches.  

In case you are interested, it is 260 to 280 g which is 9 to 10 ounces.  And the internal pressure is .30 to .325 kg/cm squared or 4.26 to 4.61 psi.