Flywheel Energy Storage Calculator

Enter value and click on calculate. Result will be displayed.

Units:

Mass:
Diameter:
RPM:

Disk:

Kinetic Energy:
Joules
Inertia:
Kg mA2

Ring:

Kinetic Energy:
Joules
Inertia:
Kg mA2

Centrifugal Force:
Newtons
kgs

Surface Speed:
M/Sec

To calculate the energy stored in a flywheel, you can use the following formula for rotational kinetic energy:

Flywheel Energy Storage Formula:

Where:

  • E = Energy stored in the flywheel (Joules or Watt-seconds)
  • I = Moment of inertia of the flywheel (kg·m²)
  • ω = Angular velocity of the flywheel (radians per second)

Moment of Inertia for a Flywheel:

The moment of inertia II I for a flywheel depends on its shape. For a simple solid disc, the moment of inertia is:

Where:

  • m = Mass of the flywheel (kg)
  • r = Radius of the flywheel (m)

For a flywheel with a more complex shape (like a hoop or ring), the formula would change accordingly.

Angular Velocity:

The angular velocity ω can be calculated if you know the RPM (revolutions per minute) using the following relationship:

Where:

  • ω = Angular velocity (radians per second)
  • RPM = Revolutions per minute

Steps to Calculate Energy Stored in Flywheel:

  1. Calculate the moment of inertia of the flywheel.
  2. Convert the RPM (if provided) to angular velocity (radians per second).
  3. Use the energy formula to calculate the energy stored in the flywheel.