Pipe / Hollow Circular Section Calculator
Section properties of CHS / pipe — the most weight-efficient bending shape.
A pipe puts every gram of metal far from the axis — same-weight CHS beats solid bar ~4× in bending stiffness. Also zero weak axis: perfect for columns.
Formula
Pipe / Hollow Circular Section Calculator is a free pipe section modulus for structural engineers, fabricators and site engineers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Pipe / Hollow Circular Section Calculator
Section properties of CHS / pipe — the most weight-efficient bending shape. The calculation implements I = π(D⁴−d⁴)/64; S = 2I/D (IS 1161 / ASTM A53 section tables). A pipe puts every gram of metal far from the axis — same-weight CHS beats solid bar ~4× in bending stiffness. Also zero weak axis: perfect for columns.
How to use Pipe / Hollow Circular Section Calculator
- 1Enter Outer diameter in mm.
- 2Enter Wall thickness in mm.
- 3Read I, S, Area instantly — no submit button needed.
- 4Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Pipe / Hollow Circular Section Calculator?
- ✓Implements the standard formula — I = π(D⁴−d⁴)/64; S = 2I/D
- ✓Reference cited on-page: IS 1161 / ASTM A53 section tables
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Pipe / Hollow Circular Section Calculator use?+
It computes I = π(D⁴−d⁴)/64; S = 2I/D, per IS 1161 / ASTM A53 section tables. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
A pipe puts every gram of metal far from the axis — same-weight CHS beats solid bar ~4× in bending stiffness. Also zero weak axis: perfect for columns.
Can I use this for real structural design?+
It implements the exact textbook/code formula cited below the result and is ideal for sizing, checking and learning. Final designs should be verified by a qualified engineer against the full code with all load cases.
Is the Pipe / Hollow Circular Section Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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