Calculate kinetic energy stored in a rotating flywheel.
Flywheel Specifications
Energy Results
Enter flywheel specs
About this calculator
Quick Reference
I (Inertia)½mr² (Solid Disk)
ω (Angular Speed)2π × RPM / 60
EKinetic Energy (Joules)
1 Wh3,600 Joules
Overview
Flywheel Energy Storage Systems (FESS) store energy in the form of rotational kinetic energy. They are known for high power output and long cycle life.
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Pro Tips
Energy increases with the square of the rotational speed (RPM).
Most modern high-speed flywheels use carbon-fiber composites to withstand centrifugal forces.
A flywheel's energy is halved if its RPM is reduced by about 30%.
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Fun Facts
"The ISS uses high-speed flywheels for attitude control and energy storage."
"Formula 1 cars have used kinetic energy recovery systems (KERS) based on flywheels."
"Some grid-scale flywheels can rotate in a vacuum at over 50,000 RPM."
