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What is the formula for Radius of gyration?

Radius of gyration is the distance between the given axis and the centre of mass of the body. The centre of mass of a body is point where the entire mass of the body is supposed to be concentrated. It is denoted by ‘K ’.

If M is mass of the body, the moment of inertia is given as,
Moment of inertia (I) = mass of the body (M) × (radius of gyration)2

So, the formula for radius of gyration (K) is given as,

radius of gyration

where K = radius of gyration, I = Moment of inertia and M = mass of the body.