Work out the weight of steel plate, pipe, bar, rebar and sections, per piece and for a quantity, in metric or imperial units. Carbon steel, stainless steel and aluminium.
Weight = cross-section area × length × density. With the area in mm², the length in metres and the density in kg/m³, the weight in kilograms is area × length × density ÷ 1,000,000.
| Shape | Cross-section area |
|---|---|
| Plate, sheet, flat bar | width × thickness |
| Round bar, rebar | π × d² ÷ 4 |
| Square bar | side² |
| Hex bar | 0.866 × s², s across flats |
| Pipe | π × t × (OD − t) |
| Square / rectangular tube | A × B − (A − 2t) × (B − 2t) |
| Angle | t × (A + B − t) |
| Channel | h × tw + 2 × (b − tw) × tf |
| Beam (I / H) | 2 × b × tf + (h − 2 × tf) × tw |
Two shortcuts the trade uses, both for carbon steel: a rebar or round bar weighs d² ÷ 162 kg per metre (d in mm), and a pipe weighs (OD − t) × t × 0.02466 kg per metre. A 114.3 × 6.02 mm pipe (4-inch schedule 40) is 16.07 kg/m.
| Diameter | kg / m | kg / 12 m bar | Bars per tonne (12 m) |
|---|---|---|---|
| 8 mm | 0.395 | 4.74 | 211.2 |
| 10 mm | 0.617 | 7.40 | 135.2 |
| 12 mm | 0.888 | 10.65 | 93.9 |
| 14 mm | 1.208 | 14.50 | 69.0 |
| 16 mm | 1.578 | 18.94 | 52.8 |
| 18 mm | 1.998 | 23.97 | 41.7 |
| 20 mm | 2.466 | 29.59 | 33.8 |
| 22 mm | 2.984 | 35.81 | 27.9 |
| 25 mm | 3.853 | 46.24 | 21.6 |
| 28 mm | 4.834 | 58.00 | 17.2 |
| 32 mm | 6.313 | 75.76 | 13.2 |
| 36 mm | 7.990 | 95.88 | 10.4 |
| 40 mm | 9.865 | 118.38 | 8.4 |
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