Flywheel Energy Calculator

Inputs

Flywheel model

Choose the mass distribution model used for I.

Mass (m)

Total rotating mass represented by the selected model.

Outer diameter (Dₒ)

Flywheel outside diameter.

Speed (n)

Rotational speed.

rpm

Default result

Stored energy(E)

1.097kJ

Pass

stored rotational energy

Also computed

Mass moment of inertia(I)0.2

kg·m²

Rim speed(v)20,940mm/s

check material stress separately

Angular speed(ω)104.7

rad/s

Method notes 3 notes

Rotational energy E = 1/2·I·ω², with I = 1/2·m·r² for the selected mass distribution.
A rim-heavy flywheel stores more energy than a solid disk with the same mass, outside diameter and RPM.
This is an energy and inertia estimate only. Flywheel burst stress, shaft attachment, balance and guarding need separate design checks.