Section Properties Calculator
Calculate area, centroid, second moments of area, product of inertia, radius of gyration, elastic section modulus, and polar moment for common structural sections and double sections.
Input section dimensions
All dimensions must use the same unit, for example mm.
Dimension guide
Use the sketch to understand the required parameters.
Calculated section properties
Results are based on centroidal x-x and y-y axes.
| Property | Symbol | Value | Unit form |
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Section Properties Calculator
The Section Properties Calculator is a practical online engineering tool designed to calculate the main geometric properties of different structural sections quickly and accurately. This calculator is useful for civil engineers, structural engineers, mechanical engineers, students, researchers, designers, and anyone who needs to evaluate the behaviour of a cross-section under bending, shear, axial load, or torsion-related checks.
This online calculator can calculate section properties for many common shapes, including I-shape sections, T-shape sections, channel sections, angle sections, hollow rectangular sections, hollow circular sections, hat sections, solid rectangular sections, solid circular sections, and other practical engineering profiles. It can also calculate the properties of double I-shape sections, double channel sections, and double angle sections. For double sections, the user can enter the clear spacing distance x between the two sections, and the calculator considers this distance in the final section property calculations.
One of the key advantages of this tool is that each section type is presented with a clear dimension guide. When the user selects a section, a separate figure appears on the screen showing the required parameters such as width, height, flange thickness, web thickness, diameter, wall thickness, and spacing distance. This makes the calculator very easy to use, especially for students or engineers who want to avoid confusion when entering dimensions. The section sketches help users understand exactly what each input means before starting the calculation.
The calculator provides a full table of important section properties, including cross-sectional area, centroid location, Ixx, Iyy, Ixy, polar second moment of area, radius of gyration, elastic section modulus, and principal second moments of area. These properties are essential for structural analysis and design because they directly affect the stiffness, strength, stability, and bending resistance of structural members.
For example, Ixx is commonly used to evaluate bending resistance about the major axis, while Iyy is important for bending about the minor axis. The centroid helps engineers understand the geometric centre of the section, and the section modulus is useful for calculating bending stress. The radius of gyration is also important in column buckling and stability checks. For unsymmetrical sections such as angles and channels, the calculator also provides Ixy, which is useful for more advanced analysis involving principal axes.
This online section properties calculator is fully responsive and can be used on mobile phones, tablets, laptops, and desktop computers. The layout automatically adjusts to different screen sizes, making it suitable for use on-site, in the office, at university, or during structural design work.
Overall, this calculator is a valuable tool for fast preliminary design, engineering education, section comparison, and structural analysis. It helps users save time, reduce manual calculation errors, and better understand the geometric behaviour of different cross-sections. Whether you are checking a simple rectangular beam, a hollow circular tube, a steel channel, an angle section, or a built-up double section, this calculator provides a clear and user-friendly way to calculate section properties online.