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This is known as parallel axes theorem.

Statement:

If IG be the moment of inertia of a body of mass M about an axis passing through its centre of gravity, then MI (I) of the same body about a parallel axis at a distance 'a' from the previous axis will be given as I = IG + M a2

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Q: Moment of inertia of parallel axis?
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If moment of inertia of a body change of axis of rotation?

If the moment of inertia of a body changes due to a change of axis of rotation, the new moment of inertia can be calculated using the parallel axis theorem. This theorem states that the moment of inertia about a new axis parallel to the original axis can be found by adding the mass of the body multiplied by the square of the distance between the two axes.


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What is moment of inertia of partially filled tube with liquid and set horizontal rotating about a vertical axis passing through its center?

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What is the moment of inertia about an axis of rotation body?

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What is the value of moment of inertia of ellipse about its centroidal axis?

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