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Flywheel Stored Energy & RPM Calculator

E = ½Iω² — energy stored in a spinning flywheel.

Calculates the kinetic energy stored in a flywheel from its moment of inertia and rotational speed, and the usable energy between two speeds.

Marcus Laurent By Marcus Laurent
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

E = ½ × I × ω²; ΔE = ½I(ω1²−ω2²); ω = 2π×RPM/60

In depth

Calculates the kinetic energy stored in a flywheel from its moment of inertia and rotational speed, and the usable energy between two speeds.