Moment of inertia is a very important property in the study of rotational mechanics. The concept of
moment of inertia is analogous to mass in the linear motion, and its calculation is routinely done
through integration. This paper provides an alternative way to compute moments of inertia of rigid
bodies of regular shape using their symmetrical property. This approach will be very useful and
preferred for teaching rotational mechanics at the undergraduate level, as it does not require the
knowledge or the application of calculus. The seven examples provided in this paper will help
readers to understand clearly how to use the method.