Free flywheel energy storage calculator. Compute moment of inertia, kinetic energy, coefficient of speed fluctuation and energy fluctuation for solid disk, thin ring and hub configurations.
Flywheel problems come up constantly in Theory of Machines and Machine Design. The standard calculation needs you to know I, then work out the energy fluctuation, then pick the right Cs for your application and size the flywheel accordingly. Every time I tried to do this on exam papers or in practice, I would mix up units between RPM and rad/s.
I built this so you can just select the flywheel shape, put in mass, radius and operating speeds and get all the important outputs in one shot. I included the shape factor selector because most calculators assume a solid disk by default, which is almost never the actual case in real machines where you have a rim with spokes.