Density of Aluminium: Table of Aluminium Alloy Densities

The density of pure aluminium is about 2.70 g/cm³, or 2,700 kg/m³ — roughly a third of steel (about 7.85) and copper (about 8.96). That lightness makes aluminium ideal for reducing the weight of cars, aircraft and structures.

Density of common alloys

Heavier elements such as copper and zinc raise the density slightly, while magnesium and silicon lower it a little.

Calculating weight from density

Weight = volume × density. To quickly work out the weight of round bar, billet, tube, sheet or ingot, use our online aluminium weight calculator.

Density and casting quality

In the foundry, comparing the density of a sample solidified under vacuum with that of a normal sample (the density index test) shows how much gas is dissolved in the melt — a simple quality check explained in our article on degassing aluminium melts.