Free, instant weight calculation for every Indian standard steel section. Add multiple items, get per-piece and total weights, export to CSV. Built on official IS 808 and IS 1786 weight tables for ISMB, ISHB, ISMC, ISA and TMT rebar — with formulas for plates, rounds, squares, flats, hex bar and pipes calculated at mild steel density 7,850 kg/m³.
Steel weight depends on two things: the cross-sectional area of the section and its length. Multiply that volume by the density of the material and you get mass. For mild steel, the density used in every Indian standard (IS 808, IS 1786, IS 2062) is 7,850 kg/m³ — equivalent to 7.85 g/cm³.
For standard rolled sections (ISMB, ISHB, ISMC, ISA, TMT rebar), the weight per metre is published directly in the IS 808 and IS 1786 tables. This calculator uses those official values, so the result for a rolled section is simply weight per metre × length × quantity. No assumption or approximation involved.
For raw geometric shapes (round bar, square bar, flat bar, plate, hex bar, pipe), the calculator computes the cross-sectional area from your dimensions and multiplies by length and density. The formulas are standard and accurate to within rolling tolerance:
Where D = diameter (mm), A = side (mm), W = width (mm), T = thickness or wall thickness (mm), L = length (m), OD = outer diameter (mm). Constants 7.85 represent mild steel density expressed for the relevant unit conversion.
Mild steel is approximately 98% iron with carbon content under 0.25% and trace amounts of manganese, silicon, phosphorus and sulphur. The density of pure iron is 7,874 kg/m³, and the small amount of carbon and other elements brings the average density of typical mild steel to 7,850 kg/m³. This is the value formally adopted by the Bureau of Indian Standards for all weight calculations of structural sections, rebar and plate.
Other common metals for reference:
| Material | Density (kg/m³) | Use |
|---|---|---|
| Mild steel (IS 2062) | 7,850 | This calculator. Default for ISMB, ISHB, ISMC, ISA, TMT, plates |
| Stainless steel 304 | 8,000 | Food, chemical, decorative |
| Stainless steel 316 | 8,000 | Marine, pharmaceutical |
| Cast iron | 7,200 | Engine blocks, manhole covers |
| Aluminium 6061 | 2,700 | Aerospace, automotive panels |
| Brass | 8,500 | Plumbing, decorative, fittings |
| Copper | 8,960 | Electrical conductors, tubing |
| Lead | 11,340 | Radiation shielding, batteries |
If you need to calculate weight for a non-mild-steel material, multiply the result from this calculator by the ratio of your material's density to 7,850. For example, for stainless steel 304: kgSS = kgMS × (8,000 / 7,850) = kgMS × 1.019.
The values below are taken directly from IS 808:1989 (rolled sections) and IS 1786:2008 (TMT rebar). They are the same values used inside this calculator.
| Diameter | Weight per metre | Pieces per tonne (12 m bars) |
|---|---|---|
| 6 mm | 0.222 kg/m | ~375 |
| 8 mm | 0.395 kg/m | ~211 |
| 10 mm | 0.617 kg/m | ~135 |
| 12 mm | 0.888 kg/m | ~94 |
| 16 mm | 1.580 kg/m | ~53 |
| 20 mm | 2.466 kg/m | ~34 |
| 25 mm | 3.854 kg/m | ~22 |
| 28 mm | 4.834 kg/m | ~17 |
| 32 mm | 6.313 kg/m | ~13 |
| 36 mm | 7.990 kg/m | ~10 |
| 40 mm | 9.864 kg/m | ~8 |
| Designation | Depth | Weight per metre | Metres per tonne |
|---|---|---|---|
| ISMB 100 | 100 mm | 11.5 kg/m | ~87 |
| ISMB 125 | 125 mm | 13.0 kg/m | ~77 |
| ISMB 150 | 150 mm | 14.9 kg/m | ~67 |
| ISMB 175 | 175 mm | 19.3 kg/m | ~52 |
| ISMB 200 | 200 mm | 25.4 kg/m | ~39 |
| ISMB 225 | 225 mm | 31.2 kg/m | ~32 |
| ISMB 250 | 250 mm | 37.3 kg/m | ~27 |
| ISMB 300 | 300 mm | 44.2 kg/m | ~23 |
| ISMB 350 | 350 mm | 52.4 kg/m | ~19 |
| ISMB 400 | 400 mm | 61.5 kg/m | ~16 |
| ISMB 450 | 450 mm | 72.4 kg/m | ~14 |
| ISMB 500 | 500 mm | 86.9 kg/m | ~12 |
| ISMB 550 | 550 mm | 103.7 kg/m | ~10 |
| ISMB 600 | 600 mm | 122.6 kg/m | ~8 |
Full ISMB profile data with sectional properties: View all I-beams