Section Calculator

A section properties calculator: draw or assemble a cross-section and read its area, centroid, moment of inertia (I_x, I_y), principal axes, radii of gyration, and elastic + plastic section moduli — updated live as you draw. Place a standard steel section, or draw plates and cut holes. It draws both centers — the elastic centroid and the plastic neutral axis — which coincide only on a doubly symmetric shape. It also handles composite sections by the transformed-section method.

• Place any of 2,686 published steel sections across six standards — AS4100, AISC, EN 10365, BS 4, JIS and IS 808.
• Draw plates, polylines and arcs, cut holes, and combine regions with union and subtraction.
• Area, centroid, Ix and Iy, product of inertia, principal axes and angle, radii of gyration, elastic and plastic moduli.
• Two centers, both drawn: the elastic centroid and the plastic neutral axis — which are the same point only on a doubly symmetric section.