How to calculate steel plate weight
A plate is a simple rectangular section, so its weight is just volume × density:
Weight (kg) = Length (m) × Width (m) × Thickness (mm) × 7.85
The handy rule is that each 1 mm of plate thickness weighs 7.85 kg per square metre for carbon steel. So a 10 mm plate is 78.5 kg/m², a 6 mm plate is 47.1 kg/m², and so on. Use the calculator above with the "Plate / Flat Bar" profile — enter width and thickness for weight per metre, or treat width as your sheet width and length as the sheet length.
Steel plate weight per square metre
| Thickness | Weight (kg/m²) |
|---|---|
| 3 mm | 23.55 |
| 5 mm | 39.25 |
| 6 mm | 47.10 |
| 8 mm | 62.80 |
| 10 mm | 78.50 |
| 12 mm | 94.20 |
| 20 mm | 157.00 |
| 25 mm | 196.25 |