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Standard mild steel plate weights calculated using density 7.85 g/cm³. Formula: Thickness (mm) × 7.85 = kg/m².
| Thickness (mm) | Weight per m² (kg) | 2500 × 1250 mm (kg) | 2000 × 1000 mm (kg) |
|---|---|---|---|
| 2 | 15.7 | 49.06 | 31.4 |
| 3 | 23.55 | 73.59 | 47.1 |
| 4 | 31.4 | 98.13 | 62.8 |
| 5 | 39.25 | 122.66 | 78.5 |
| 6 | 47.1 | 147.19 | 94.2 |
| 8 | 62.8 | 196.25 | 125.6 |
| 10 | 78.5 | 245.31 | 157 |
| 12 | 94.2 | 294.38 | 188.4 |
| 16 | 125.6 | 392.5 | 251.2 |
| 20 | 157 | 490.63 | 314 |
| 25 | 196.25 | 613.28 | 392.5 |
| 32 | 251.2 | 785 | 502.4 |
| 40 | 314 | 981.25 | 628 |
| 50 | 392.5 | 1226.56 | 785 |
The weight of a steel plate is calculated by multiplying its volume by the density of mild steel (7,850 kg/m³ or 7.85 g/cm³):
For quick per-square-metre estimates, simply multiply the plate thickness in millimetres by 7.85:
Find the weight of a 10mm thick MS plate measuring 2500 mm × 1250 mm:
Quick check: 10 mm × 7.85 = 78.5 kg/m², and 2.5 × 1.25 = 3.125 m², so 78.5 × 3.125 = 245.31 kg.
Multiply Length (mm) × Width (mm) × Thickness (mm) × 7.85, then divide by 1,000,000 to get weight in kilograms. The constant 7.85 represents mild steel density in g/cm³.
MS plate weight (kg) = L (mm) × W (mm) × T (mm) × 7.85 ÷ 1,000,000. Alternatively, weight per square metre = Thickness (mm) × 7.85 kg/m².
A 10mm mild steel plate weighs 78.5 kg per square metre, calculated as 10 × 7.85 = 78.5 kg/m².
The density of mild steel (MS) is 7,850 kg/m³, which equals 7.85 g/cm³. This value is used as the standard constant in all steel plate weight calculations.