This free online calculator helps you quickly determine the section modulus (Z) of steel rectangular tubing, a key value in assessing bending resistance and structural performance. Whether you’re designing support frames, structural members, or checking safety limits, this tool supports both metric (mm³) and imperial (in³) units for seamless global use.
Hollow/Steel Square Tube Section Modulus Calculator
Section Modulus (Syy/Y-Y Axis): —cm³
Moment of Inertia (Ixx): —cm⁴
Moment of Inertia (Iyy): —cm⁴
Default values are for RHS 100×50×3.2mm: H = 100 mm, B = 50 mm, t = 3.2 mm.
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✅ Key Features
- 💡 Calculates section modulus (Z) for rectangular steel tubes
- 📏 Supports both metric and imperial units
- ⚙️ Suitable for SHS (Rectangular Hollow Sections)
- 🔧 Ideal for structural design, beam analysis, and profile bending projects
- ⚡ Instant output with no signup required
✅ How to Use
- Select your preferred unit: mm / inch
- Input outer width and wall thickness of the rectangular tube
- Click “Calculate” to get the section modulus (Z) instantly
- Use the result to evaluate bending resistance or structural suitability
✅ Frequently Asked Questions (FAQ)
Q1: What is the section modulus used for?
A: It’s a structural measure that shows a beam or profile’s resistance to bending.
Q2: Does this calculator work for rectangular tubes?
A: No. This version is for rectangular tubes only. Use our Rectangular Tube Calculator for RHS profiles.
Q3: Can I use this calculator for aluminum rectangular tubing?
A: Yes. The section modulus formula applies to all materials with the same cross-section shape.
Q4: Do I need to convert units manually?
A: No. Just choose mm or inch before entering your values, and the calculator handles the rest.