Physics

Flywheel Energy Storage Calculator

Find the rotational energy stored in a flywheel.

Calculated Output

Stored energy (J) 246,740.11

Stored energy (Wh) 68.539

Formula: E = ½·I·ω², ω = rpm·2π/60

Step-by-Step Breakdown

1. Values used:

2. Moment of inertia = 5 kg·m²

3. Rotation speed = 3,000 rpm

5. Stored energy = 246,740.11J

6. Stored energy = 68.539Wh

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The math behind it

E = ½·I·ω². Convert rpm to rad/s with ω = rpm·2π/60. Energy rises with the square of speed.

I = 5 kg·m² at 3000 rpm → about 246.7 kJ.

Why spin fast rather than heavy?

Energy scales with ω², so higher speed stores far more than added mass.