Aluminium weight & density
Aluminium alloys used for extrusions and bar — 6063, 6061, 6082 — have a density of about 2700 kg/m³ (0.098 lb/in³), roughly a third of steel. The chart lists common aluminium sections by weight per metre and per foot; weigh any extrusion or bar from its section in the tool below.
| Size | Shape | Area · mm² | Weight · kg/m | Weight · lb/ft |
|---|---|---|---|---|
| 20×20 T-slot | T-Slot Extrusion | 140 | 0.378 | 0.254 |
| 40×40 T-slot | T-Slot Extrusion | 580 | 1.565 | 1.052 |
| ⌀20 round bar | Round Rod | 314 | 0.848 | 0.570 |
| 40×5 flat bar | Flat Bar | 200 | 0.540 | 0.363 |
| L 40×40×4 | Angle | 304 | 0.821 | 0.552 |
| SHS 40×40×3 | Square Hollow | 444 | 1.199 | 0.806 |
| RHS 60×40×3 | Rectangular Hollow | 564 | 1.523 | 1.023 |
| ⌀50×3 tube | Round Tube | 443 | 1.196 | 0.804 |
Computed from the exact section area × 2,700 kg/m³ (Aluminium extrusion 6063-T5, clear anodized). Fillets excluded (<2%). Verify against certified data before release.
DXF (LWPOLYLINE/CIRCLE) · CSV/XLSX with X,Y columns (blank row = new loop). DWG → export as DXF first.
EL 69,000 MPa · Aluminium extrusion 6063-T5, clear anodized
| Area | A | 5472 | mm² |
| Mass / metre | m | 14.774(9.928 lb/ft) | kg/m |
| 2nd moment | Ix | 4.754e+7 | mm⁴ |
| 2nd moment | Iy | 3.487e+6 | mm⁴ |
| Section mod. | Sx | 396173 | mm³ |
| Section mod. | Sy | 58118 | mm³ |
| Gyration | rx | 93.21 | mm |
| Gyration | ry | 25.24 | mm |
| Torsion | J | 262656 | mm⁴ |
| Published catalogue weight: 8.40 kg/m · computed Δ 76% | |||
Derived exactly from the section polygon (Green’s theorem). Fillets excluded (<2% effect). Verify against certified data before release.
The density of aluminium
Pure aluminium is 2700 kg/m³; the common structural alloys vary only slightly — 6061 and 6063 are ≈2700, 7075 is a bit higher at ≈2810. For extrusion and general fabrication, 2.70 g/cm³ (0.098 lb/in³) is the standard figure. That is about 34% of steel's weight for the same section.
T-slot and extrusion weight
Extruded profiles remove material where it isn't needed, so a slotted 40×40 T-slot is far lighter than a solid 40×40 bar of the same envelope — around 0.85 kg/m versus 4.3 kg/m. The tool models the slot geometry so the weight reflects the real void pattern, not just the bounding box.
Light where stiffness allows
Aluminium's low density is why it dominates framing, transport and consumer products. But it is a third as stiff as steel, so sections are usually deeper to compensate. Compare the same envelope in aluminium, steel and FRP in the tool to see weight and modulus trade off together.
FAQ
What is the density of aluminium?+
About 2700 kg/m³ (2.70 g/cm³, 0.098 lb/in³) for common alloys like 6061 and 6063 — roughly one third the density of steel.
How much does a 40×40 aluminium T-slot weigh?+
About 0.85 kg/m for a standard single-bore 40×40 profile in 6063 — much less than a solid 40×40 bar because the slots and bore remove material.
How do I calculate aluminium extrusion weight?+
Weight per metre = cross-sectional area (m²) × 2700. Dimviz integrates the exact area of the extrusion — including slots and bores — and multiplies by density.