Physics

Flywheel Energy Calculator

Calculate kinetic energy stored in a rotating flywheel.

Last validated: Pending

Use this free online Flywheel Energy Calculator to estimate kinetic energy stored in a rotating flywheel. It supports direct moment-of-inertia and angular-velocity inputs, or derived calculations from flywheel shape, mass, radius, and RPM. The tool is useful for physics labs, machine-design screening, energy-storage comparisons, and sanity checks on rotating assemblies. Outputs depend strongly on geometry and speed, so the selected flywheel shape and unit consistency matter. Use the result for planning and education, then validate material stress limits, bearings, containment, and safety factors before any real mechanical build.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Flywheel Parameters

Calculation Mode

Derived From Shape, Mass & Speed Direct From I & ω

Flywheel Shape

Mass (kg)

Radius (m)

Rotational Speed (RPM)

Stored Kinetic Energy

Ready to spin up the calculations!

Enter flywheel parameters to see stored energy.

How to use this tool

Choose the calculation mode based on whether you know moment of inertia directly or need it derived from shape, mass, and radius.
Enter flywheel shape, mass, radius, rotational speed, moment of inertia, or angular velocity as applicable.
Run the calculator and review the stored kinetic energy output.
Validate stresses, speed limits, and containment requirements separately before applying the result to physical hardware.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Expected Outputs

Interpretation

Confirm unit consistency and operational constraints before applying this result in production or field conditions.

Confidence and limitations

Outputs are deterministic formula results and depend entirely on input quality and units.
Results are for planning and learning; verify with domain standards before safety-critical use.
Models are idealized and may ignore drag, friction, nonlinearity, and measurement error.

Formula References

SI-unit forms of classical mechanics and wave equations.
Idealized models unless explicitly stated otherwise.

Assumptions

Outputs are deterministic formula results and depend entirely on input quality and units.
Results are for planning and learning; verify with domain standards before safety-critical use.
Models are idealized and may ignore drag, friction, nonlinearity, and measurement error.

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Tailored guides for specific audiences, regions, and scenarios.

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Mechanical Engineering and Physics Equipment

Shop for high-quality motors, flywheels, and physics lab equipment.

Flywheel Energy Calculator

Input Pattern

Flywheel Parameters

Stored Kinetic Energy

How to use this tool

Worked Example

Example Inputs

Expected Outputs

Interpretation

Confidence and limitations

Formula References

Assumptions

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Mechanical Engineering and Physics Equipment