Formula
The density of steel is taken as 7.85 g/cm³, so one square metre of 1 mm steel sheet weighs 7.85 kg.
Weight (kg) = Thickness (mm) × Width (m) × Length (m) × 7.85
Coil length (m) = Coil weight (kg) ÷ (Thickness (mm) × Width (m) × 7.85)
The zinc coating adds the value of its class (e.g. 0.275 kg/m² for Z275). Actual weight may deviate 1–3% from the calculated value due to thickness tolerance, coating and paint.
For trapezoidal sheet, weight is calculated from the developed width: Trapezoidal Sheet Weight Calculator
Worked examples
| Size | Calculation | Result |
|---|---|---|
| 0.50 × 1000 × 2000 mm | 0.50 × 1.00 × 2.00 × 7.85 | 7.85 kg |
| 1.00 × 1250 × 2500 mm | 1.00 × 1.25 × 2.50 × 7.85 | 24.53 kg |
| 2.00 × 1500 × 3000 mm | 2.00 × 1.50 × 3.00 × 7.85 | 70.65 kg |
| 5 t coil, 0.50 × 1250 mm | 5000 ÷ (0.50 × 1.25 × 7.85) | 1,019.1 m |
Weight per m² by thickness
| Thickness | Steel (kg/m²) | Incl. Z275 (kg/m²) |
|---|---|---|
| 0.40 mm | 3.14 | 3.42 |
| 0.50 mm | 3.93 | 4.20 |
| 0.60 mm | 4.71 | 4.99 |
| 0.80 mm | 6.28 | 6.56 |
| 1.00 mm | 7.85 | 8.13 |
| 1.20 mm | 9.42 | 9.70 |
| 1.50 mm | 11.78 | 12.05 |
| 2.00 mm | 15.70 | 15.98 |
| 2.50 mm | 19.63 | 19.90 |
| 3.00 mm | 23.55 | 23.83 |