Aluminum Weight Calculator — Sheet, Tube, Bar & Extrusion Profile
Aluminum weight = volume × alloy density (2.66–2.81 g/cm³ depending on alloy). This calculator covers sheet, plate, round/rectangular tube, bar, and custom extrusion profiles — enter dimensions and get piece weight, weight per meter, and total shipment weight instantly.
Pick a shape, type dimensions — the result updates instantly, no button needed.
How the math works
Every shape reduces to the same base formula — volume × density. The steps below show exactly what this calculator computes, so you can re-check any result by hand or in a spreadsheet.
| Sheet / plate | Weight (kg) = Length × Width × Thickness (mm) × Density (g/cm³) ÷ 1,000,000 |
| Round tube | Weight (kg) = π/4 × (OD² − ID²) (mm²) × Length (mm) × Density (g/cm³) ÷ 1,000,000, where ID = OD − 2 × wall |
| Rectangular tube | Weight (kg) = [Width×Height − (Width−2t)×(Height−2t)] (mm²) × Length (mm) × Density (g/cm³) ÷ 1,000,000 |
| Round bar | Weight (kg) = π/4 × Diameter² (mm²) × Length (mm) × Density (g/cm³) ÷ 1,000,000 |
| Flat bar | Weight (kg) = Width × Thickness × Length (mm) × Density (g/cm³) ÷ 1,000,000 |
| Extrusion profile | kg/m = Cross-section area (cm²) × Density (g/cm³) ÷ 10; Total weight (kg) = kg/m × Length (m) |
3 steps to a shipment weight
- 01Pick a shape and alloy
Choose sheet/plate, round or rectangular tube, bar, or a custom extrusion profile, then pick the alloy (1050-7075). Density updates automatically.
- 02Enter dimensions
Type length, width/OD, wall thickness or diameter in mm or inches. For extrusion profiles, enter the cross-section area in cm² from your drawing instead.
- 03Read the weight
The result updates instantly as you type — no submit button. Switch units to kg/lb or m/ft to match your paperwork.
Common questions
Why do different aluminum alloys weigh different amounts?
Density varies by alloy family because of the alloying elements. 5xxx-series alloys (5052 ≈2.68, 5083 ≈2.66 g/cm³) use magnesium, which is lighter than aluminum itself, so they run slightly less dense. 7xxx-series alloys (7075 ≈2.81 g/cm³) add zinc and copper for strength, which raises density. For common construction alloys (6061, 6063) the difference from generic 2.70 g/cm³ is under 1%, but it adds up across a full container load.
Is this theoretical weight or actual shipping weight?
This is theoretical weight from nominal dimensions and alloy density — the same math behind a mill certificate's calculated weight. Actual piece weight can run a few percent lighter or heavier depending on extrusion tolerance (wall-thickness variance is usually the largest factor), cutting-length tolerance, and any anodizing or coating add-on weight. For a firm shipping weight, ask your supplier for actual scale weight on the specific die, not the theoretical figure.
How do I get the cross-section area for an extrusion profile from a drawing?
If the supplier's drawing lists it, it's usually labeled "sectional area" near the die number, in mm² or cm². If it isn't labeled, most CAD tools (AutoCAD, SolidWorks) report the enclosed area directly from the 2D profile outline. As a fallback, some mills already quote a theoretical kg/m — divide that by the alloy density (g/cm³) and multiply by 10 to back-calculate the area in cm².
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