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Hollow Section Weight Calculator — SHS & RHS kg/m

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Section dimension unit Outside width Outside height Wall thickness Must be less than half the smaller outside dimension.Piece length unit Piece length Number of pieces Whole pieces only.Material density (kg/m³) Use a documented material density.Rate per kg (optional) 0 disables cost.Target mass unit Target mass (optional) Reverse-solves whole entered-length pieces.Supplier / measured kg per metre (optional) Reports variance without replacing theoretical geometry.

Calculated result

131.88 kg · 290.75 lb

10.99 kg/m · 7.3849 lb/ft

1,400 mm² theoretical sharp-corner metal area · 65.94 kg per piece

0.3 m²/m outside perimeter-based coating area before corner-radius correction

Enter rate/kg for procurement cost

Enter target mass for reverse whole-piece count

Enter supplier kg/m to audit corner/tolerance variance

Show the working

1. Inside size = (100 − 2×5) × (50 − 2×5) = 90 × 40 mm.
2. Metal area = 5,000 − 3,600 = 1,400 mm².
3. Unit mass = 1,400 × 10⁻⁶ × 7,850 = 10.99 kg/m.
4. Batch mass = 10.99 × 6 × 2 = 131.88 kg.

This is a sharp-corner geometric estimate. Real SHS/RHS has formed corner radii, weld upset, coatings and dimensional/mass tolerances, so certified mill tables can differ. Do not use calculated mass to accept material, infer structural capacity or replace the governing section standard.

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