Most disputes at unloading are about weight, not rate. If you know the theoretical weight of what you ordered, you can check a load in minutes. Below are the formulas the trade uses - and a free calculator in the portal that converts pieces, metres and tonnes for you.
Open the Steel Weight CalculatorRegister free| Shape | Weight formula | Units |
|---|---|---|
| TMT bar / round bar | d x d / 162 | kg per metre, d in mm |
| Square bar | a x a x 0.00785 | kg per metre, a in mm |
| Flat bar | width x thickness x 0.00785 | kg per metre, mm |
| Plate / sheet | L x W x t x 7.85 | kg, L and W in m, t in mm |
| Pipe (round) | (OD - t) x t x 0.02466 | kg per metre, mm |
| Angle (approx.) | (A + B - t) x t x 0.00785 | kg per metre, mm |
| Any section | area (cm2) x 0.785 | kg per metre |
| Item | Working | Result |
|---|---|---|
| 16 mm TMT, 12 m bar | 16 x 16 / 162 = 1.580 kg/m; x 12 | 18.96 kg |
| 50 x 10 mm flat, 6 m | 50 x 10 x 0.00785 = 3.925 kg/m; x 6 | 23.55 kg |
| 2.5 m x 1.25 m plate, 8 mm | 2.5 x 1.25 x 8 x 7.85 | 196.25 kg |
| 88.9 x 4.0 mm pipe, 6 m | (88.9 - 4) x 4 x 0.02466 = 8.375 kg/m; x 6 | 50.25 kg |
| 25 mm square bar, 6 m | 25 x 25 x 0.00785 = 4.906 kg/m; x 6 | 29.44 kg |
| Diameter | kg per 12 m bar | Bars per tonne (approx.) |
|---|---|---|
| 8 mm | 4.74 | 211 |
| 10 mm | 7.41 | 135 |
| 12 mm | 10.67 | 94 |
| 16 mm | 18.96 | 53 |
| 20 mm | 29.63 | 34 |
| 25 mm | 46.30 | 22 |
| 32 mm | 75.85 | 13 |
Formulas give the theoretical (nominal) weight. Rolled steel varies within the tolerances of its standard, so the weighbridge figure will not match exactly. Decide before you award an order whether billing is on theoretical or actual weight, and write it into the deal - on Indian Steel Portal the deal note records it for both sides.
Convert your bar bending schedule, cutting list or drawing quantities into tonnes before you publish an inquiry, so the quantity sellers quote on is the quantity you need. The in-app calculator is free and open to any visitor.
Weight in kg per metre = diameter x diameter / 162 (diameter in mm). Multiply by the length - for a 12 m bar of 12 mm: 0.889 x 12 = 10.67 kg.
Length (m) x width (m) x thickness (mm) x 7.85 gives the weight in kg.
(Outside diameter - wall thickness) x wall thickness x 0.02466 gives kg per metre, with sizes in mm.
Rolled steel is made within dimensional tolerances, so actual weight differs from the theoretical figure. Agree the billing basis in advance.
Yes. The in-app calculator on Indian Steel Portal is free and open to any visitor - no registration needed.
Last updated 8 October 2026.
