Moment of Inertia - HyperPhysics Concepts

Having called this a general form, it is probably appropriate to point out that it is a general form only for axes which may be called "principal axes", a term which includes all axes of symmetry of objects. The concept of moment of inertia for general objects about arbitrary axes is a much more complicated subject. The moment of inertia in such cases takes the form of a mathematical tensor quantity which requires nine components to completely define it.

 Calculate moment of inertia of plane sections e.g. channel, angle, tee etc.
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The () and radius of gyration (also called second area moments) of any shape are properties that define its structural rigidity (ability to withstand deformation) about a given axis.

Area Moment of Inertia - Typical Cross Sections I

The area moments calculator also calculates the orientation of  or  axes to enable you to get the most from your section.
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This calculator gives the values of moment of inertia as well as the values of section modulus about x-axis and y-axis of the section. Section modulus helps in determining the strength of the beam. Please enter the "Input Values" in the form given below and click "Calculate". You should enter all the values in same units and this calculator will provide the "Output Results" in the corresponding units (unit2 , unit3 , unit4 etc.). You can also vist

Mass moment of inertia - University of Nebraska–Lincoln

then the moment of inertia contribution by an infinitesmal mass element dm has the same form. This kind of mass element is called a of mass and its moment of inertia is given by


The second moment of area about the principal axes ( & , ) of a regular shape (rectangle, I-Beam, circular tube, etc.) normally refers to its maximum and minimum structural planes of rigidity.

Moment of Inertia - Georgia State University

Moment of inertia is defined with respect to a specific rotation axis. The moment of inertia of a with respect to an axis is defined as the product of the mass times the distance from the axis squared. The moment of inertia of any extended object is built up from that basic definition. The of the moment of inertia involves an .

Welcome to SkyCiv's Free Moment of Inertia Calculator

A true within a true ellipse will not give a constant wall thickness so only solid shapes are calculated. You may use 'Sector' to calculate the properties of hollow circular sections. However, as the centre-of-areas of two coincident ellipses are in the same place you may simply add or subtract their areas and second moments of area (see Radius of Gyration above). Cross-checking example (with Polygons - above): Set ; and ;