By Zencalcy Editorial TeamLast reviewed About us
Aluminium weighs about 2,700 kg/m³ — roughly a third of steel — which is why it wins on weight-sensitive parts. Alloying changes density by only a few percent, so a single figure is accurate enough for estimating stock, freight and machining allowances.
Weight of aluminium plate, bar, tube and pipe by alloy.
Plate: m = L × W × T × 2700 Round: m = π × (d/2)² × L × 2700 Tube: m = π/4 × (D² − d²) × L × 2700
Dimensions are converted to metres before multiplying by density in kg/m³. Alloy 6061 is 2,700 kg/m³, 7075 is 2,810 and pure aluminium is 2,700. Mill finish tolerances mean the delivered weight can differ by 2–5%.
| Symbol | Meaning |
|---|---|
| L, W | Plate length and width. |
| T | Plate thickness. |
| D, d | Outside and inside diameter of a tube. |
| ρ | Density, 2,700 kg/m³ for aluminium. |
The plate is 4 × 2 ft × 0.25 in, which is 0.0206 m³ of aluminium, so it weighs about 55.6 kg, or 122.6 lb.
Continue with the Gravel Calculator, Sand Calculator, Rock Calculator, or the River Rock Calculator — or browse more materials & quantities and all construction calculators.
Slightly. 6061 is 2,700 kg/m³, 2024 is 2,780 and 7075 is 2,810. For estimating a few percent is usually enough.
Results use standard construction estimating arithmetic: volumes from measured area and depth, unit weights from published material densities, and code-referenced spans or clearances where the page names a code. Quantities are rounded up to whole saleable units and include the stated waste allowance. These tools are planning aids, not structural design, and do not replace a licensed engineer, a local code check, or a contractor's site measurement.
Reference material used to build and check this calculator:
Last reviewed: September 2026. See how we build and check every tool on the about page.
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Content updated: September 2026