ONE FORMULA, ONE ANSWER
Rotational Kinetic Energy Calculator
Check stored rotation energy in a flywheel or a rigid rotor. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Rotational kinetic energy K_rot
Enter values and select Calculate.
K_rot = I ω² / 2
Assumptions
Use I>0 and rigid-body rotation about a fixed axis. Mass moment of inertia in kg·m² differs from area moment of inertia in m⁴. Convert rpm to rad/s. Translational energy is excluded.
Displayed values are floating-point approximations. Measurement uncertainty and design safety factors are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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