Second Moment of Area Calculations

Calculating the Second Moment of Area of T, I, C and Square Section Beams

These are second moment of area (moment of inertia) calculations for common beam section shapes. The units are stated as mm but you can use any units you like as long as you're consistent. I used the parallel axis theorem for the calculations so users can introduce a degree of irregularity into the cross section shapes.

You can check out the javaScript code for the calculations by viewing the page source. Each shape has a separate function to calculate the moments of area and the code is written in a very simple way so the algorithms are quite easy to follow.To keep the code simple I've avoided including the distances to the neutral axis, the cross sectional areas and polar moments of inertia in the outputs but they are easy access if you want to adapt the code for your own applications. Feel free to use the source code as you see fit.