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Density table
| Material | Density (g/cm³) | Density (kg/m³) | Notes |
|---|---|---|---|
| Carbon steel (S235, S355) | 7.85 | 7,850 | |
| Stainless 304 (1.4301) | 7.93 | 7,930 | 7.90–8.00 |
| Stainless 316 (1.4401) | 8.00 | 8,000 | |
| Stainless 430 (1.4016) | 7.70 | 7,700 | ferritic |
| Aluminium | 2.70 | 2,700 | alloys: 2.65–2.80 |
| Copper | 8.96 | 8,960 | |
| Brass | 8.50 | 8,500 | 8.4–8.7, by alloy |
| Bronze | 8.80 | 8,800 | 8.7–8.9, by alloy |
| Zinc | 7.14 | 7,140 | |
| Titanium | 4.51 | 4,510 | |
| Cast iron | 7.20 | 7,200 | 7.0–7.3, by type |
| Lead | 11.34 | 11,340 | |
| Nickel | 8.91 | 8,910 | |
| Tin | 7.29 | 7,290 | |
| Magnesium | 1.74 | 1,740 |
The values are the usual ones, at room temperature. For alloys, density varies with composition: for a part that matters, use the value from the material certificate.
How to calculate weight from density
Weight = volume × density. With volume in m³ and density in kg/m³, the result is in kg.
- Round steel bar Ø 20 mm, 1 m: π/4 × 0.02² × 1 × 7,850 ≈ 2.47 kg.
- Steel sheet of 3 mm: 0.003 × 7,850 = 23.55 kg/m².
- The same Ø 20 mm bar in aluminium: 0.000314 × 2,700 ≈ 0.85 kg.
For tubes, profiles and sheets, the calculator does this automatically, using the density of the chosen material.
Frequently asked questions
How much does a cubic metre of steel weigh?
About 7,850 kg (7.85 tonnes) for carbon steel. Stainless 304 is 7,930 kg/m³ and aluminium 2,700 kg/m³.
What is the difference between density and specific weight?
Density is mass per unit volume (kg/m³). Specific weight is weight per unit volume (N/m³), that is density multiplied by gravitational acceleration. In the workshop, “specific weight” is often used, loosely, to mean density.
Why is stainless steel heavier than ordinary steel?
Because it has chromium and nickel in the alloy, which are heavier than iron: stainless 304 is 7.93 g/cm³ against 7.85 g/cm³ for carbon steel, about 1 % more.
What is the density of aluminium?
2.70 g/cm³ (2,700 kg/m³) for pure aluminium; alloys vary between 2.65 and 2.80 g/cm³. About a third of steel.