Metal Weight Calculator
Calculate the weight of steel and metal profiles — pipes, angles, channels, plates, round bars, and rebar.
Need to calculate concrete blocks for your project? Try our Concrete Block Calculator.
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How It Works
Weight = Cross-section area (m²) × Length (m) × Density (kg/m³). The cross-section area formula varies by profile shape. Results are accurate within 1–2% for standard profiles.
Understanding Metal Weight Calculation
Metal weight calculation is essential in structural engineering, fabrication, and construction. Knowing the weight of steel and metal profiles helps with material estimation, transportation planning, and structural load analysis.
Weight Calculation Formulas
The fundamental formula for calculating metal weight is:
Each profile shape uses a different cross-section area formula:
- Round Pipe: A = π/4 × (OD² − (OD−2T)²)
- Square Pipe: A = Side² − (Side−2T)²
- Angle (L): A ≈ A×T + (B−T)×T
- Channel (C): A ≈ 2×Flange×T + (H−2T)×WebT
- Flat Bar: A = W × T
- Round Bar: A = π/4 × D²
- Plate: A = W × T
- Rebar: A = π/4 × D² (nominal diameter)
How to Calculate Metal Weight
Engineering Applications
- Structural estimation: Calculate total steel weight for bill of quantities and cost estimation.
- Transportation planning: Determine load weights for truck and crane scheduling.
- Fabrication: Estimate material requirements for cutting and welding operations.
- Load analysis: Verify structural member weights for design calculations.
- Procurement: Convert between metric and imperial units for international orders.
Frequently Asked Questions
How do you calculate MS pipe weight?
MS (mild steel) pipe weight uses a density of 7,850 kg/m³. For a round pipe, the cross-section area is calculated as π/4 × (OD² − (OD−2t)²), where OD is the outer diameter and t is the wall thickness. Multiply the area by 7,850 to get weight per meter.
What is the density difference between MS and stainless steel?
Mild steel (MS) has a density of 7,850 kg/m³, SS304 is 7,930 kg/m³, and SS316 is 7,990 kg/m³. The difference is about 1–2%. While small, this matters in large quantities where accurate weight estimation affects cost and structural calculations.
How do you calculate rebar weight?
The standard formula is d²/162, where d is the nominal diameter in mm. This gives weight in kg/m. For example, 12 mm rebar = 144/162 = 0.889 kg/m. The full formula is π/4 × d² × 7850 / 1,000,000, which simplifies to approximately d²/162.
Is MS pipe weight the same as GI pipe weight?
GI (galvanized iron) pipes are MS pipes with a zinc coating that adds approximately 3–5% weight. The base steel density is the same (7,850 kg/m³). For most calculations, using the MS density is sufficiently accurate for GI pipes.
How accurate is this metal weight calculator?
Results are within 1–2% accuracy for standard profiles. Actual weight may vary due to manufacturing tolerances, surface treatments, alloy composition variations, and rounding of nominal dimensions. For critical structural applications, always verify with supplier specifications.