Flywheel Energy Calculator
Calculate kinetic energy stored in a flywheel. Determine moment of inertia, angular velocity, and energy in ft·lb, Joules, and Wh.
Inputs
lb
in
in
RPM
Results
Kinetic Energy
39,409.67 ft·lb
Energy
14.84 Wh
Moment of Inertia3,700 lb·in²
Kinetic Energy53,432.35 J
Angular Velocity314.16 rad/s
How to Use This Calculator
- Enter the Flywheel Mass in lb — heavier flywheels store proportionally more energy.
- Enter the Outer Radius in inches. Energy scales with radius squared, so a larger outer radius dramatically increases storage.
- Enter the Inner Radius (Bore) in inches — set to 0 for a solid disk flywheel.
- Enter the Rotational Speed in RPM. Energy scales with RPM squared, so doubling speed quadruples stored energy.
- Review Kinetic Energy in ft·lb and Joules, and stored Energy in Wh for direct comparison with battery systems.
- Use the Moment of Inertia (lb·in²) value for dynamic and shaft-load calculations.
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