How do I calculate Cross-Section Properties?

To calculate Cross-Section Properties: Enter Cross-section type, Dimension 1 (width b / outer D), Dimension 2 (height h / outer H) and other values. Click Calculate. INDUGRID computes the result instantly using the formula: I_rectangle = b×h³/12 | I_circle = π×d⁴/64 | W = I/c | i = √(I/A). No registration required.

What units does the Cross-Section Properties calculator use?

The Cross-Section Properties calculator uses the following units: mm. SI units are used by default.

Is the Cross-Section Properties calculator free?

Yes. The INDUGRID Cross-Section Properties calculator is completely free, requires no account or login, and works on desktop and mobile browsers.

Structural Engineering

Cross-Section Properties

Calculate geometric properties (area, second moment of area, section modulus) for common structural cross-sections.

Units:

in LinkedIn

💡The section modulus W = I/c determines bending strength. The radius of gyration i = √(I/A) determines buckling behaviour. For equal bending stiffness, a hollow section uses significantly less material than a solid section — important for weight-critical designs.

I_rectangle = b×h³/12 | I_circle = π×d⁴/64 | W = I/c | i = √(I/A)

Input

Cross-section type iSelect the cross-section shape.

Dimension 1 (width b / outer D) iRectangle: width b. Circle: outer diameter D. I-section: flange width b.

Dimension 2 (height h / outer H) iRectangle: height h. Hollow: outer height H. I-section: total height H.

Wall thickness t (hollow) / flange tf (I) iWall thickness for hollow sections. Flange thickness for I-sections. Leave 0 for solid sections.

Web thickness tw (I-section only) iWeb thickness for I-sections in mm. Only used for I-section type.

Result

Cross-section area A [cm²] —

Second moment I_y (strong axis) [cm⁴] —

Section modulus W_y [cm³] —

Second moment I_z (weak axis) [cm⁴] —

Radius of gyration i_y [cm] —

Mass per metre (steel) [kg/m] —