How to Calculate Steel Weight (Formula & Examples)
Steel weight equals volume × density. Use 7850 kg/m³ (7.85 g/cm³) for carbon steel, then multiply by length and quantity in the calculator.
Author: Iron Metal Editorial — Steel sections specialist
Core formula
- Use the core formula. Weight = Volume × Density.
- Convert units. If dimensions are in mm, convert to meters before computing volume.
- Multiply by density. Typical steel density is ~7850 kg/m³ (~7.85 g/cm³).
- Verify with calculator or catalog. Use the calculator for totals, or open a catalog size page for theoretical kg/m.
Quick example
Plate: 2m × 1m × 10mm (0.01m). Volume = 0.02m³. Weight ≈ 0.02×7850 = 157kg.
Free downloadable reference
- Download PDF
Steel Weight Formula Cheat Sheet (PDF)
One printable page with the core density formula, common shapes, and three worked examples.
FAQ
Is it 100% accurate? It's an estimate—standards, density, and tolerances vary. Confirm supplier specs.
Which density should I use? Often 7.85 g/cm³ (7850 kg/m³) for steel.
How do I get weight per meter for sections? Best: open the size page in the catalog or use the calculator.
Where are the full guides? See the guides hub for IPE, HP/H, plate, rebar, pipe, and procurement roll-up guides.