Steel weight calculator
Work out the weight of any steel section — bar, tube, beam, angle, channel or hollow section — in kg/m or lb/ft. Pick a shape or a standard size, and Dimviz multiplies the exact cross-sectional area by steel's density (7.85 g/cm³) to give weight per length. Switch to stainless (7.9), aluminium, copper or FRP with one click; the geometry is computed from the section, so the weight is exact, not tabulated.
DXF (LWPOLYLINE/CIRCLE) · CSV/XLSX with X,Y columns (blank row = new loop). DWG → export as DXF first.
EL 23,000 MPa · Pultruded FRP (E-glass / polyester)
| Area | A | 4544 | mm² |
| Mass / metre | m | 8.634(5.802 lb/ft) | kg/m |
| 2nd moment | Ix | 2.306e+7 | mm⁴ |
| 2nd moment | Iy | 7.579e+6 | mm⁴ |
| Section mod. | Sx | 230601 | mm³ |
| Section mod. | Sy | 151571 | mm³ |
| Gyration | rx | 71.24 | mm |
| Gyration | ry | 40.84 | mm |
| Torsion | J | 1.758e+7 | mm⁴ |
Derived exactly from the section polygon (Green’s theorem). Fillets excluded (<2% effect). Verify against certified data before release.
How steel weight per length is calculated
Weight per length = cross-sectional area × density. For steel that's area × 7.85 g/cm³ (7850 kg/m³, 0.284 lb/in³). Dimviz integrates the area from your section — a 200×100×8 RHS, a Ø25 round bar or an I-beam all get their true area — then multiplies by density and reports kg/m and lb/ft.
Any steel section, standard or custom
Load a standard EN/DIN or US size, dial a dimension by hand, or import a DXF of a custom section. Because the weight follows the geometry, a wall-thickness change updates the kg/m instantly — no lookup table, no interpolation.
FAQ
How do you calculate the weight of steel?+
Weight per metre = cross-sectional area (m²) × 7850 kg/m³. For a round bar, area = π/4 × diameter². Dimviz computes the area from any shape and multiplies by steel density, giving kg/m and lb/ft.
What is the density of steel?+
Structural steel is about 7850 kg/m³ (7.85 g/cm³, 0.284 lb/in³); stainless 304 is about 7900 kg/m³.
Can it do stainless, aluminium or copper?+
Yes — switch the material and the same section is reweighed at stainless 7.9, aluminium 2.7, copper 8.94 or FRP 1.9 g/cm³.