Mass moments of inertia calculator

The moment of inertia, otherwise known as the angular mass or rotational inertia,  is a measure of an object’s resistance to change in rotation direction. Moment of Inertia has the same relationship to angular acceleration as mass has to linear acceleration.

• Moment of Inertia of a body depends on the distribution of mass in the body with respect to the axis of rotation

For a point mass the Moment of Inertia is the mass times the square of perpendicular distance to the rotation reference axis and can be expressed as

I = m r²                 

Where

I = moment of inertia (kg m²)

m = mass (kg)

r = distance between axis and rotation mass (m)