Steel section weights per metre
Box section, round tube, angle, flat and round bar in common sizes: kilograms per metre and per 6m length, for lifting, delivery and pricing by weight. Every figure is worked out from the section, and the method is below.
Square hollow section (SHS)
Size in mm. “Rounded corners” uses the corner radii of EN 10219-2 for cold-formed sections, which is what most suppliers’ tables show; “square corners” is the simple sum, a little heavier.
| Size (mm) | kg/m, rounded corners | kg/m, square corners | 6m length (kg) |
|---|---|---|---|
| 20×20×2 | 1.05 | 1.13 | 6.3 |
| 25×25×2 | 1.36 | 1.44 | 8.2 |
| 25×25×3 | 1.89 | 2.07 | 11.3 |
| 30×30×2 | 1.68 | 1.76 | 10.1 |
| 30×30×3 | 2.36 | 2.54 | 14.2 |
| 40×40×2 | 2.31 | 2.39 | 13.8 |
| 40×40×3 | 3.30 | 3.49 | 19.8 |
| 40×40×4 | 4.20 | 4.52 | 25.2 |
| 50×50×3 | 4.25 | 4.43 | 25.5 |
| 50×50×4 | 5.45 | 5.78 | 32.7 |
| 50×50×5 | 6.56 | 7.06 | 39.4 |
| 60×60×3 | 5.19 | 5.37 | 31.1 |
| 60×60×4 | 6.71 | 7.03 | 40.3 |
| 60×60×5 | 8.13 | 8.63 | 48.8 |
| 70×70×4 | 7.97 | 8.29 | 47.8 |
| 80×80×4 | 9.22 | 9.55 | 55.3 |
| 80×80×5 | 11.27 | 11.77 | 67.6 |
| 80×80×6 | 13.21 | 13.94 | 79.3 |
| 100×100×4 | 11.73 | 12.06 | 70.4 |
| 100×100×5 | 14.41 | 14.91 | 86.5 |
| 100×100×6 | 16.98 | 17.71 | 101.9 |
| 100×100×8 | 21.39 | 23.11 | 128.3 |
| 120×120×5 | 17.55 | 18.05 | 105.3 |
| 120×120×6 | 20.75 | 21.48 | 124.5 |
| 150×150×6 | 26.40 | 27.13 | 158.4 |
| 150×150×8 | 33.95 | 35.67 | 203.7 |
Rectangular hollow section (RHS)
| Size (mm) | kg/m, rounded corners | kg/m, square corners | 6m length (kg) |
|---|---|---|---|
| 40×20×2 | 1.68 | 1.76 | 10.1 |
| 50×25×2 | 2.15 | 2.23 | 12.9 |
| 50×25×3 | 3.07 | 3.25 | 18.4 |
| 50×30×3 | 3.30 | 3.49 | 19.8 |
| 60×40×3 | 4.25 | 4.43 | 25.5 |
| 60×40×4 | 5.45 | 5.78 | 32.7 |
| 80×40×3 | 5.19 | 5.37 | 31.1 |
| 80×40×4 | 6.71 | 7.03 | 40.3 |
| 100×50×3 | 6.60 | 6.78 | 39.6 |
| 100×50×4 | 8.59 | 8.92 | 51.6 |
| 100×50×5 | 10.48 | 10.99 | 62.9 |
| 120×60×4 | 10.48 | 10.80 | 62.9 |
| 120×60×5 | 12.84 | 13.34 | 77.0 |
| 120×80×5 | 14.41 | 14.91 | 86.5 |
| 150×50×5 | 14.41 | 14.91 | 86.5 |
| 150×100×5 | 18.33 | 18.84 | 110.0 |
| 150×100×6 | 21.69 | 22.42 | 130.2 |
| 200×100×6 | 26.40 | 27.13 | 158.4 |
| 200×100×8 | 33.95 | 35.67 | 203.7 |
Round tube (CHS)
Outside diameter × wall, in mm. Round tube has no corners, so this is exact for the nominal size.
| Size (mm) | kg/m | 6m length (kg) |
|---|---|---|
| 21.3×2 | 0.95 | 5.7 |
| 26.9×2 | 1.23 | 7.4 |
| 33.7×2.6 | 1.99 | 12.0 |
| 42.4×2.6 | 2.55 | 15.3 |
| 48.3×3.2 | 3.56 | 21.4 |
| 60.3×3.2 | 4.51 | 27.0 |
| 76.1×3.2 | 5.75 | 34.5 |
| 88.9×3.2 | 6.76 | 40.6 |
| 114.3×3.6 | 9.83 | 59.0 |
| 139.7×5 | 16.61 | 99.7 |
| 168.3×5 | 20.14 | 120.8 |
Equal angle
The simple sum of the two legs. Rolled angle has a root radius inside the corner, which adds about 1%.
| Size (mm) | kg/m | 6m length (kg) |
|---|---|---|
| 25×25×3 | 1.11 | 6.6 |
| 30×30×3 | 1.34 | 8.1 |
| 40×40×4 | 2.39 | 14.3 |
| 40×40×5 | 2.94 | 17.7 |
| 50×50×5 | 3.73 | 22.4 |
| 50×50×6 | 4.43 | 26.6 |
| 60×60×6 | 5.37 | 32.2 |
| 75×75×6 | 6.78 | 40.7 |
| 75×75×8 | 8.92 | 53.5 |
| 100×100×8 | 12.06 | 72.3 |
| 100×100×10 | 14.91 | 89.5 |
Flat bar, kg per metre
Width down the side, thickness across the top, in mm.
| Width | 3mm | 5mm | 6mm | 8mm | 10mm | 12mm |
|---|---|---|---|---|---|---|
| 20 | 0.47 | 0.78 | 0.94 | 1.26 | 1.57 | 1.88 |
| 25 | 0.59 | 0.98 | 1.18 | 1.57 | 1.96 | 2.35 |
| 30 | 0.71 | 1.18 | 1.41 | 1.88 | 2.35 | 2.83 |
| 40 | 0.94 | 1.57 | 1.88 | 2.51 | 3.14 | 3.77 |
| 50 | 1.18 | 1.96 | 2.35 | 3.14 | 3.92 | 4.71 |
| 60 | 1.41 | 2.35 | 2.83 | 3.77 | 4.71 | 5.65 |
| 75 | 1.77 | 2.94 | 3.53 | 4.71 | 5.89 | 7.06 |
| 100 | 2.35 | 3.92 | 4.71 | 6.28 | 7.85 | 9.42 |
Round bar
| Diameter (mm) | kg/m | 6m length (kg) |
|---|---|---|
| Ø10 | 0.62 | 3.7 |
| Ø12 | 0.89 | 5.3 |
| Ø16 | 1.58 | 9.5 |
| Ø20 | 2.47 | 14.8 |
| Ø25 | 3.85 | 23.1 |
| Ø30 | 5.55 | 33.3 |
| Ø40 | 9.86 | 59.2 |
| Ø50 | 15.41 | 92.5 |
How the weights are worked out
Weight per metre is the area of the cross-section times the density: mild steel is 7,850kg/m³, which is 0.00785kg per metre for every square millimetre of section.
- Box section: 2 × wall × (width + height) − 4 × wall². For rounded corners, each corner then loses (4 − π) ÷ 4 × (outer radius² − inner radius²), with the outer radius 2 × wall up to 6mm wall, 2.5 × wall up to 10mm and 3 × wall above (EN 10219-2).
- Round tube: π × wall × (outside diameter − wall).
- Angle: thickness × (2 × leg − thickness). Flat: width × thickness. Round bar: π × diameter² ÷ 4.
Stainless is about 1% heavier, aluminium about a third of the weight. Hot-finished sections have tighter corners than cold-formed and weigh slightly more; for an exact figure on a big order, use the mill’s table. For any other size, shape or metal, use the metal weight calculator.
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