Flywheel Energy Storage Calculator
Enter the flywheel's mass, radius and RPM to find the energy it stores.
Result
How to use
- Enter your values in the fields above.
- Press Calculate to see your result instantly.
- Use the Share button to copy a link to your result.
About this calculator
A solid-disk flywheel's rotational kinetic energy is KE = ½Iω², where the moment of inertia of a solid disk is I = ½mr² (m = mass, r = radius) and angular velocity ω is the rotation speed in RPM converted to radians per second (ω = RPM × 2π ÷ 60). Combining these gives KE = ¼mr²ω² — energy that scales with the square of both radius and rotation speed, which is why flywheels favor spinning faster over building bigger.
Mechanical and energy-storage engineers use this relationship to size flywheels for kinetic energy recovery systems (KERS) in motorsport and regenerative braking, uninterruptible power supplies, and grid-scale flywheel energy-storage installations, where spinning mass stores energy mechanically instead of chemically the way a battery does.
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