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| Diameter (mm) | Weight per Metre (kg/m) | Weight per Foot (kg/ft) | Weight per 12m Bar (kg) |
|---|---|---|---|
| 6 mm | 0.222 | 0.068 | 2.66 |
| 8 mm | 0.395 | 0.120 | 4.74 |
| 10 mm | 0.617 | 0.188 | 7.40 |
| 12 mm | 0.889 | 0.271 | 10.67 |
| 16 mm | 1.580 | 0.482 | 18.96 |
| 20 mm | 2.469 | 0.753 | 29.63 |
| 25 mm | 3.858 | 1.176 | 46.30 |
| 28 mm | 4.834 | 1.473 | 58.01 |
| 32 mm | 6.316 | 1.925 | 75.79 |
| 36 mm | 7.990 | 2.435 | 95.88 |
| 40 mm | 9.864 | 3.007 | 118.37 |
| Thickness (mm) | Weight per m² (kg) | 2500×1250 mm Plate (kg) | 2000×1000 mm Plate (kg) |
|---|---|---|---|
| 3 mm | 23.55 | 73.6 | 47.1 |
| 5 mm | 39.25 | 122.7 | 78.5 |
| 6 mm | 47.10 | 147.2 | 94.2 |
| 8 mm | 62.80 | 196.3 | 125.6 |
| 10 mm | 78.50 | 245.3 | 157.0 |
| 12 mm | 94.20 | 294.4 | 188.4 |
| 16 mm | 125.60 | 392.5 | 251.2 |
| 20 mm | 157.00 | 490.6 | 314.0 |
| 25 mm | 196.25 | 613.3 | 392.5 |
| 32 mm | 251.20 | 785.0 | 502.4 |
Steel weight calculation is essential for construction estimation, logistics planning, and material procurement across India. The weight of any steel section depends on three factors: the cross-sectional area, the length, and the density of the material (7,850 kg/m³ for mild steel).
The most commonly used formula in Indian construction is d² ÷ 162.2, where d is the bar diameter in mm. This gives weight in kg per metre. For example, a 16mm TMT bar: 16² ÷ 162.2 = 1.580 kg/m. A standard 12-metre bar weighs 18.96 kg. This formula is derived from the circular cross-section area (πd²/4) multiplied by the density of steel.
For flat products, use: Weight (kg) = L × W × T × 7.85 ÷ 1,000,000 (all dimensions in mm). A quicker method: Thickness (mm) × 7.85 = weight per square metre. So a 10mm plate weighs 78.5 kg/m².
For hollow round sections: Weight (kg/m) = (OD − WT) × WT × 0.02466, where OD is outer diameter and WT is wall thickness, both in mm.
Use the appropriate formula for the section type. For round bars/TMT: d² ÷ 162.2 = kg/m. For plates: L × W × T × 7.85 ÷ 1,000,000. For pipes: (OD − WT) × WT × 0.02466 = kg/m. All formulas assume mild steel density of 7,850 kg/m³.
The d²/162 formula (precisely d²/162.2) calculates TMT bar or round bar weight per metre. Square the diameter in mm, divide by 162.2, and you get kg/m. Example: 12mm bar = 144 ÷ 162.2 = 0.889 kg/m.
A 12mm TMT bar weighs 0.889 kg per metre. A standard 12-metre bar weighs approximately 10.67 kg. This applies to all grades (Fe500, Fe500D) as the grade affects strength, not weight.
Mild steel density is 7,850 kg/m³ (7.85 g/cm³). Stainless steel SS304 is 8,000 kg/m³ and SS316 is 8,027 kg/m³. Our calculator adjusts automatically when you select a different grade.
Multiply Length × Width × Thickness (all in mm), then multiply by 7.85 and divide by 1,000,000. Quick shortcut: thickness in mm × 7.85 gives you weight per square metre in kg.