The density of pure aluminium is 2.70 g/cm³ (2700 kg/m³). Different alloy grades vary slightly: 1100 series is 2.71 g/cm³, 6061 is 2.70 g/cm³, 7075 is 2.81 g/cm³, and 5052 is 2.68 g/cm³. This calculator automatically applies the correct density for each selected alloy grade, so your results are accurate for your specific material.

To calculate aluminium sheet weight: Weight (kg) = Length (m) × Width (m) × Thickness (m) × Density (kg/m³). For example, a 2m × 1m × 5mm (0.005m) sheet of 6061 aluminium (density 2700 kg/m³): Weight = 2 × 1 × 0.005 × 2700 = 27 kg. This calculator accepts dimensions in millimetres, centimetres, metres, inches, or feet and converts automatically.

Aluminium round bar weight formula: Weight (kg) = π × (Diameter ÷ 2)² × Length × Density. For example, a 50mm diameter, 3m long 6061 bar: Weight = π × (0.025)² × 3 × 2700 = π × 0.000625 × 3 × 2700 ≈ 15.9 kg. Select “Round Bar” in the shape picker above and enter the diameter and length to get your result instantly.

Aluminium tube weight formula: Weight = π × ((OD/2)² − (ID/2)²) × Length × Density, where OD is outer diameter and ID is inner diameter. This calculator uses outer diameter and wall thickness as inputs (ID = OD − 2 × wall thickness), making it easier to use standard stock specifications. For example, a 60mm OD, 3mm wall, 2m tube of 6061: inner diameter = 54mm, volume of annulus × density = approximately 9.0 kg.

The best alloy depends on your application: 6061 is the most versatile — good strength, weldable, widely available, ideal for structural and general fabrication. 5052 is the top choice for marine and corrosive environments. 7075 offers the highest strength but is harder to weld and machine. 1100 is ideal for forming and food-contact applications. 6063 is preferred for architectural extrusions. For most engineering and fabrication projects, 6061 is the safest default choice.

Aluminium is approximately one-third the weight of steel by volume. Steel has a density of around 7850 kg/m³ versus aluminium’s ~2700 kg/m³ — so the same volume of aluminium weighs about 65% less. This makes aluminium ideal for weight-critical applications such as aerospace, automotive, and portable structures. However, aluminium has lower tensile strength, so designers sometimes specify thicker sections, but the net weight saving over steel is still typically 30–50%.

Aluminium and aluminum refer to the exact same metal — element 13 on the periodic table, symbol Al. “Aluminium” is the spelling used in British English and by the IUPAC (International Union of Pure and Applied Chemistry). “Aluminum” is the American English spelling. Both are correct; the difference is purely regional. This calculator uses the British spelling throughout.

Accurate aluminium weight calculations are essential for several reasons: structural load analysis (ensuring beams and frames can carry design loads), shipping and freight cost estimation (carriers charge by weight), material procurement (ordering the right quantity and budgeting accurately), CNC machining planning (estimating raw material usage and machining time), and compliance (vehicle payloads, lifting equipment ratings). Even small errors in weight estimation can cascade into significant cost overruns or safety issues on large projects.