properties
Mass Moment of Inertia Calculator
Explore rotational inertia for defined masses, geometries, and rotation axes.
Mass Moment of Inertia Calculator
Define your section
Point-mass rotation
Mass in kilograms
Distance from the rotation axis; enter radius, not diameter
Calculated properties
I = mr² for a point mass at radius r- This models a point mass at the entered radius, not an arbitrary solid body.
Length inputs are converted to millimetres for calculations. Review the assumptions before using results in engineering work.
About this calculation
Enter the required dimensions and select the appropriate length unit. The calculator displays results based on the selected calculation and its stated assumptions.
Moment of inertia and related section properties depend on the geometry, reference axes, units, and assumptions used. Review the displayed formula and assumptions before using any result.
These tools are intended for educational and preliminary engineering calculations. Independently verify critical results before using them in engineering design or safety-related work.
Calculation methodology
Learn about formulas, units, assumptions, and calculation limitations in our calculation methodology.