How is the weight calculated?
Weight is volume × density. The calculator works out the volume from the shape and your dimensions (in mm) and multiplies it by the density of the material. For a plate that is length × width × thickness; for a round bar π/4 × diameter² × length.
| Material | Density (g/cm³) |
|---|---|
| Steel (S235/S355) | 7.85 |
| Stainless 304 | 7.9 |
| Stainless 316 | 8 |
| Aluminium | 2.7 |
| Copper | 8.96 |
| Brass | 8.5 |
| Bronze | 8.8 |
| Cast iron | 7.2 |
| Zinc | 7.14 |
| Lead | 11.34 |
| Titanium | 4.51 |
Frequently asked questions
What is the density of steel?
Structural steel (S235/S355) has a density of about 7.85 g/cm³. Stainless 304 is around 7.9 and 316 around 8.0 g/cm³.
Can I calculate the weight of a tube?
Yes. Choose "Round tube", enter the outer diameter, wall thickness and length — the hollow core is subtracted automatically.
Which units do I use?
Enter all dimensions in millimetres (mm). The result is shown in kilograms (kg), per piece and as a total.
How accurate is the result?
The calculation is theoretical, based on nominal dimensions and standard densities. Actual weights can vary by a few percent.