Mechanical & Civil Engineering
Flywheel Kinetic Energy & Fluctuation Calculator
Determine kinetic energy storage of a flywheel and its coefficient of speed fluctuation.
Your inputs
Change any value to update the result instantly.
Stored kinetic energy
9,869.6 J
Angular speed
62.832 rad/s
Coefficient of fluctuation
0.0101
Energy fluctuation
200 J
What this calculator does
Flywheel Kinetic Energy & Fluctuation Calculator: Applies the standard machine-element relationship used in design textbooks so the capacity, rating or geometry can be worked out step by step.
What your result means
The headline figure is the capacity, rating or geometric result for the element you described. Compare it with the manufacturer's rating and your required service factor.
Formula and working
E = ½Iω²; Cf = ΔE/(Iω²)
- 1
Collect the inputs
Mass moment of inertia (I) = 5 kg·m²; Mean rotational speed = 600 rpm; Fluctuation of energy (ΔE) = 200 J
- 2
Apply the formula
E = ½Iω²; Cf = ΔE/(Iω²)
- 3
Result
Stored kinetic energy = 9,869.6 J
Frequently asked questions
Symbols and assumptions
- momentOfInertia
- Mass moment of inertia (I) (kg·m²)
- meanSpeed
- Mean rotational speed (rpm)
- energyFluctuation
- Fluctuation of energy (ΔE) (J)
- • Standard textbook geometry and steady operating conditions are assumed; shock, misalignment and wear factors are not applied automatically.
- • Material and surface-finish allowances must be chosen by the user for their actual component.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • This is an educational estimate for learning and checking, not a design deliverable.
- • Real design must follow the governing code or standard for your jurisdiction and be reviewed and signed off by a qualified engineer.
- • Safety factors, load combinations and material certification are the responsibility of the designer, not of this page.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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