Calculate the energy stored in a spinning body from its moment of inertia and angular speed.
Rotational energy mirrors the linear form with moment of inertia in place of mass and angular velocity in place of speed. Because it scales with ω², flywheel energy is dominated by speed rather than mass. Flywheel storage runs at very high rpm precisely because energy scales with the square of speed but only linearly with inertia.
Rotational Kinetic Energy
E = ½ I ω²
E = ½ I ω² Rotational energy mirrors the linear form with moment of inertia in place of mass and angular velocity in place of speed. Because it scales with ω², flywheel energy is dominated by speed rather than mass.
Flywheel storage runs at very high rpm precisely because energy scales with the square of speed but only linearly with inertia.
This calculator takes 2 inputs: Moment of inertia, Angular velocity. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.