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Section Properties Calculator

Moment of inertia, section modulus, radius of gyration, and source boundaries for geometry review

Field guide: Wood Beam Spans: NDS Allowable Stress Design Explained

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Section properties are geometry inputs for later structural or mechanical review, not approval by themselves. The screen reports area, centroid prompts, moment of inertia, section modulus, radius of gyration, and limited plastic-modulus rows while keeping AISC, ACI, NIST, and qualified-review warnings visible.

Local rectangle, circle, I-shape, channel, angle, tube, tee, and rectangular-component prompts are useful for checking idealized geometry and parallel-axis arithmetic. Cached W-shape rows are treated as source-bounded lookup aids, not a current AISC Shapes Database replacement, member selection, LRFD design, or code approval.

Use the output to organize geometry, catch unit mistakes, and prepare questions for current source review. Material grade, effective length, bracing, local buckling, holes, welds, connections, load combinations, fabrication tolerance, adopted code, and PE review remain outside the app.

Pro Tip: A small input mismatch can move section properties enough to affect later checks. Before using a result downstream, confirm the geometry source, unit system, material grade, fabrication details, openings, bracing, and design code with current project documents and qualified review.

Screen beam deflection prompts with source warnings

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How It Works

  1. Select Shape or Build Custom

    Choose an idealized shape, a cached W-shape row, or custom rectangular components. Treat source warnings as part of the input screen.

  2. Enter Dimensions

    Enter dimensions in one unit system and avoid mixing catalog, field, and fabricated dimensions without a current source.

  3. Review Source Warnings

    Check the section properties, source pointers, assumptions, and residual gaps before using the result in another design workflow.

Features & Capabilities

Source-Bounded Shape Prompts

Rectangle, circle, hollow circle, I-shape, channel, angle, tee, tube, and cached W-shape prompts are labeled as local geometry rows.

Custom Rectangular Components

Build a composite section from rectangular elements and review the centroid and parallel-axis contributions before source review.

Geometry Output

Screens area, centroid location, Ix, Iy, Sx, Sy, rx, ry, limited Zx prompts, and source warnings for the selected shape.

Visual Diagram

Cross-section diagram highlights the entered geometry, centroid prompt, and neutral-axis orientation for review.

Report Boundary

Report and PDF exports carry source pointers, assumptions, residual gaps, and PE-review warnings with the numbers.

References

  1. AISC Shapes Database v16 source pointer for standard steel-shape property context
  2. AISC Steel Construction Manual 16th Edition source pointer for design-table context
  3. AISC 360-22 and ACI 318 source pointers for design-boundary warnings only
  4. NIST SP 811 source pointer for unit conversion and rounding context

Frequently Asked Questions

No. Cached W-shape rows are local source-aware prompts. Use the current AISC Shapes Database, Steel Construction Manual, project drawings, and qualified review for design use.
No. Zx is a geometry prompt only. Compactness, lateral bracing, material grade, unbraced length, load combinations, connection behavior, and current code provisions remain outside the screen.
Idealized plate geometry omits fillets, tapers, rolling tolerances, and current database rows. Treat differences as a source-review prompt, not a rounding issue to ignore.
Disclaimer: This screen provides source-aware geometry prompts only. It does not determine member strength, deflection adequacy, buckling capacity, connection design, fabrication acceptance, code compliance, construction safety, or final design suitability.

Guides for this job

Structural

Wood Beam Spans: NDS Allowable Stress Design Explained

How maximum spans are calculated per NDS. Species and grade design values, size factor, repetitive member factor, deflection limits, and why deflection usually controls residential spans.

Read Guide →
Structural

Section Properties Source Guide: Geometry First, Design Review Second

Area, inertia, section modulus, radius of gyration, cached W-shape rows, and parallel-axis prompts with AISC, ACI, and PE-review boundaries visible.

Read Guide →

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