Rotational Kinetic Energy Calculator

Enter moment of inertia and angular speed or RPM to calculate rotational energy, angular momentum, and the equivalent rotational speed.

Moment of inertia I (kg·m²)

Angular speed

Angular-speed unit

—KEᵣ = ½Iω²

—Angular momentum

—RPM

—rad/s

—Moment of inertia

This ideal rigid-body calculation assumes the supplied moment of inertia is about the actual rotation axis.

Connected mechanics workflow

v10.88 connects translational motion, forces, momentum, energy, rotation, gravitation, waves and oscillation while preserving the established v2.3/v4.4/v10.38 physics engines.

State the model before trusting the number

Classical formulas are only as good as their assumptions and units. Air resistance, damping, deformation, non-constant forces and measurement uncertainty are not silently invented when the selected model does not include them.

How to use this Rotational Kinetic Energy Calculator

Calculate rotational kinetic energy and angular momentum from moment of inertia and angular speed.

Enter, paste, upload, or choose the inputs shown in the tool above.
Adjust the available options for the result you need.
Review the output before copying, downloading, or using it elsewhere.

What this tool does

Enter moment of inertia and angular speed or RPM to calculate rotational energy, angular momentum, and the equivalent rotational speed.

Practical tips and limits

Review the inputs and result before using the output elsewhere. Keep the original data when the operation changes or replaces content.