Estimate the centroidal area moment of inertia for a concentric hollow square section.
Square Tube Center Calculator
Results
Inertia
0
Modulus
0
Radius
0
Area
0
Table of Contents
1
What is Square Tube Center?
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How to Use This Calculator
- Enter or select A (Exterior Side), B (Interior Side).
- Check the unit beside each measurement. For a percentage or rate, use the scale and time period stated in the form.
- Choose Calculate, then compare the output with the formula and example below. If you change a value or option, calculate again to update the result.
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Formula Used
I = (outer side⁴−inner side⁴)/12
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Variables Explained
| Input | What it means |
|---|---|
| A (Exterior Side) | Use the measured or stated value for this item, with the unit or category shown beside the field. |
| B (Interior Side) | Use the measured or stated value for this item, with the unit or category shown beside the field. |
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Worked Example
Outer side 4 and inner side 2 give I=(256−16)/12=20 units⁴.
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Why Use This Calculator?
Use the result to put measurements on a common basis before comparing them or estimating quantities. The original measurement precision still limits the precision of the answer.
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Common Mistakes
- Area moment of inertia uses fourth-power length units, not mass moment-of-inertia units.
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Frequently Asked Questions
When should I round a measurement?
Carry the measured values and conversion factors through the calculation first. Round the final result to a precision justified by the original measurements.
Why can a supplier’s quantity differ?
Measurement conventions, nominal sizes, density assumptions and purchase rounding can change a practical quantity. Compare the units and assumptions before comparing the numbers.
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Sources & References
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