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Aluminium / Aluminum Weight Calculator

Aluminium is about one-third the mass of steel, which is why it dominates aerospace structures, machine guards, jigs and architectural sections. General aluminium and 6061 are taken as 2.70 g/cm³. 7075 is closer to 2.81 g/cm³ because of its zinc content.

Aluminium · 2.7 g/cm³

Commercially pure / general aluminium, ~2.70 g/cm³.

Result

0.27kg

Volume
100 cm³
Volume (m³)
0.0001
Density
2.7 g/cm³
Density
2,700 kg/m³

V = L × W × T W = V × ρ

Why a dedicated aluminium page?

Use this landing page for 6061 plate, extruded bar, 7075 tooling plate and general aluminium sheet. Switch the alloy in the calculator if you are quoting 7075 versus 6061 — the 4% density difference shows up on large billets.

Formula

Weight (kg) = Volume (m³) × 2700 for 6061 / commercially pure. For 7075 use 2810 kg/m³.

6061 plate 12 mm × 500 mm × 500 mm

Volume = 0.5 × 0.5 × 0.012 = 0.003 m³. Weight = 0.003 × 2700 = 8.1 kg.

Alloys on this page

  • Aluminium — 2.7 g/cm³. Commercially pure / general aluminium, ~2.70 g/cm³.
  • Aluminium 6061 — 2.7 g/cm³. The most common structural aluminium alloy.
  • Aluminium 7075 — 2.81 g/cm³. Zinc-alloyed aerospace grade; a little denser than 6061.

Cast aluminium can sit nearer 2.65–2.70 g/cm³. Anodising is negligible for weight. If the stock is tread plate or has a heavy mill finish, add a small allowance.

See the full material weight calculator for plastics, titanium, tool steels and custom densities, or jump to Steel, Copper, Stainless steel, Brass.

Frequently asked questions

How is metal weight calculated?+

Weight equals volume × density. Volume comes from the shape (for example length × width × thickness for a plate, or πr²L for a round bar). Density is looked up for the selected material, or entered manually for a custom alloy.

What density is used for mild steel?+

Mild steel is calculated at 7.85 g/cm³ (7850 kg/m³), which is the value most fabrication shops and steel stockholders use for estimating plate, bar and section mass.

Can I mix millimetres and inches?+

Yes. Each dimension has its own unit (mm, cm, m, inch, feet). The calculator converts everything internally to a consistent system before applying the density, then reports weight in the unit you choose.

How accurate is the result?+

The geometry is exact for the dimensions you enter. Real parts vary with mill tolerance, coating, chamfers and actual alloy density (stainless 304 vs 316, cast vs wrought aluminium). Treat the figure as a reliable estimate, not a certified weighbridge reading.

Does this include pipe schedules?+

Use the Pipe or Tube shape and enter outside diameter and wall thickness. That covers any schedule once you know OD and WT from a pipe chart.

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