Online rebar theoretical weight calculation with quick spec selection
This calculator computes the theoretical weight of steel reinforcement bars. Enter the diameter, length, and quantity to quickly calculate total weight. It supports common size quick-select and shows a weight-per-meter reference table.
Rebar weight calculation is fundamental for construction budgeting and material procurement. Accurate calculation helps control costs and reduce waste.
Formula: Weight per meter (kg/m) = 0.00617 × Diameter^2 (mm^2)
Total weight = Weight per meter × Length (m) × Quantity
Common sizes weight per meter: - Φ6: 0.222 kg/m - Φ8: 0.395 kg/m - Φ10: 0.617 kg/m - Φ12: 0.888 kg/m - Φ14: 1.21 kg/m - Φ16: 1.58 kg/m - Φ18: 2.00 kg/m - Φ20: 2.47 kg/m - Φ22: 2.98 kg/m - Φ25: 3.85 kg/m - Φ28: 4.83 kg/m - Φ32: 6.31 kg/m
Formula derivation: Steel density 7850 kg/m^3 Volume per meter = π × (d/2)^2 × 1 = π × d^2/4 × 10^-6 m^3 Weight per meter = 7850 × π × d^2/4 × 10^-6 ≈ 0.00617 × d^2