Material Weight Calculator
Compute weight from dimensions and material density.
Calculator
No signup required. Results are indicative—verify for your standards.
Mass: 15.700 kg (0.0157 tonnes)
Formula
Mass (kg) = Volume (m³) × Density (kg/m³). Volume = L × W × H for rectangular sections, π × (D/2)² × L for cylinders.
Example calculation
Steel flat bar 200 × 50 × 6 mm, ρ = 7850 kg/m³: V = 0.2 × 0.05 × 0.006 = 0.00006 m³, mass = 0.00006 × 7850 ≈ 0.471 kg.
Engineering notes
Use actual density for your material grade. Carbon steel 7850 kg/m³, SS 316 7980 kg/m³, aluminium 2710 kg/m³, copper 8960 kg/m³. For hollow sections subtract inner volume.
When to use this calculator
- Lifting plan — determine sling and crane loads before rigging structural steel members
- Material take-off — estimate steel tonnage for fabrication quotes and procurement
- Shipping — calculate gross weight of steel components for freight and customs declarations
- Structural loading — provide dead load input for foundation and frame design calculations
- Inventory — maintain weight records for material stock management
Frequently asked questions
- What density should I use for different steel grades?
- Carbon steel (mild steel, IS 2062, A36): 7850 kg/m³. Stainless steel 304: 7930 kg/m³. Stainless steel 316/316L: 7980 kg/m³. High-strength alloy steel: 7750–7850 kg/m³. For most structural steel calculations, 7850 kg/m³ is the standard value used in IS 875, AISC, and Eurocode.
- How do I calculate the weight of a hollow rectangular section (RHS)?
- For rectangular hollow sections, compute the outer volume minus the inner volume. Outer volume = L × W_outer × H_outer. Inner volume = L × (W_outer − 2t) × (H_outer − 2t), where t is wall thickness. Mass = (Outer volume − Inner volume) × density. Alternatively, use published section weight tables from IS 4923 or ASTM A500.
- How do I estimate the weight of a complex fabricated structure?
- Break the structure into simple shapes (plates, angles, channels, pipes) and calculate each piece separately, then sum. Add 5–10% for welds, bolts, nuts, and miscellaneous hardware. For detailed structural work, use 3D CAD or structural steel detailing software which calculates weight automatically from the model.