Mass Moments of Inertia of Common Shapes
slender rod
I
y
=
I
z
=
1
12
mL
2
thin rectangular plate
I
x
=
1
12
m
(
b
2
+
c
2
)
I
y
=
1
12
mc
2
I
z
=
1
12
mb
2
rectangular prism
I
x
=
1
12
m
(
b
2
+
c
2
)
I
y
=
1
12
mc
(
c
2
+
a
2
)
I
z
=
1
12
mb
(
a
2
+
b
2
)
thin disk
I
x
=
1
2
mr
2
I
y
=
I
z
=
1
4
mr
2
circular cylinder
I
x
=
1
12
ma
2
I
y
=
I
z
=
1
12
m
(3
a
2
+
L
2
)
circular cone
I
x
=
3
10
ma
2
I
y
=
I
z
=
3
5
m
(
1
4
a
2
+
h
2
)
sphere
I
x
=
I
y
=
I
z
=
2
5
ma
2