# Moment of inertia of two point masses

I = (M*m)/(M+m)*d^2
I is the moment of inertia of two point masses about their center of mass.
Enter 'x' in the field to be calculated.

We consider a system of two point masses. The points are rotating about an axis passing through their center of mass and perpendicular to the line joining the two points. Then, the mass moment of inertia of the system is calculated as follows,

I = (M*m)/(M+m) * d^2

M and m : masses of the two particles in kilogram (kg)
d : distance between the two particles in meter (m)