Steel Weight Calculator
Calculate TMT steel bar weight using the standard D²/162 formula.
📐 Unit Weight (kg/m) = D² ÷ 162 (D in mm) · Total Weight = Unit Weight × Length × No. of Bars
The steel weight calculator computes the weight of structural steel — TMT bars (rebar), steel plates, angles, channels, I-beams, and pipes — based on dimensions and quantity. Essential for construction quantity estimators, fabricators, and contractors, it converts between weight and length for bars of different diameters, and calculates material cost and procurement quantities.
📋 How to Use This Calculator
Select the steel section type (TMT bar/rebar, flat plate, angle, channel, I-beam, pipe, or square hollow section). Enter dimensions (diameter for bars, width/thickness for plates, standard size for sections). Enter quantity (length in metres or number of pieces). The calculator shows weight in kg and tonnes, and cost at current market rate.
💡 Key Facts & Information
Steel density: 7,850 kg/m³. TMT bar weight formula: Weight (kg/m) = D² / 162, where D = diameter in mm. Results: 8mm bar = 0.395 kg/m; 10mm = 0.617; 12mm = 0.888; 16mm = 1.578; 20mm = 2.469; 25mm = 3.858; 32mm = 6.313 kg/m. Most used sizes in Indian residential construction: 8mm (stirrups), 10mm (slab distribution bars), 12mm (main bars, secondary beams), 16mm (main beams, columns), 20mm (large columns). Steel prices (2024): TMT bars ₹55,000–65,000 per tonne. Thumb rule for residential: 4–5 kg/sq ft of built-up area for G+1 structure; 6–8 kg/sq ft for G+3+.