The barrel is roughly cylindrical in shape except that it is bulged outwards in the middle. The barrel calculator calculates the volume of a barrel. The volume of a Barrel can be calculated by the given height and radii.
Formula for Volume of Barrel:
Volume of Barrel = (h * PI * (2* r12 + r22) / 3 )
h = Height of the Barrel
r1, r2 = Radii of the Barrel