Object 
Illustration 
Moment of inertia 
Particle 

Md2
The distance between the particle and the axis is d. 
Bar 

ML2/3
The length of the bar is L 
Bar 

ML2/12
The length of the bar is L 
Rectangular plate 

ML2/12
The length of the plate is L and is orthogonal to the axis. 
Rectangular plate 

M(L2 + W2)/12
L is the length and W is the width 
Circular plate 

MR2/2
R is the radius of the ring 
Circular plate 

MR2/4
R is the radius of the ring 
Ring 

MR2
R is the radius of the ring 
Cylinder 

MR2/2
R is the radius of the caps 
Cylinder 

MR2/4 + ML2/12
R is the radius of the caps and L is the height of the cylinder 
Spherical surface 

2MR2/3
R is the radius 
Sphere 

2MR2/5
R is the radius 