Flat Bar Weight Calculator
Calculate weight of MS patti & rectangular flat bars — width × thickness × length × density
Unit Weight
14.130 kg
Material
Mild Steel
Est. Cost
₹819.54
@ ₹58/kg
Density
7,850 kg/m³
Indicative market rate as of 16 Sept 2026, excluding 18% GST and freight. Actual prices vary by city, brand and quantity.
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📐 Flat Bar Formula
W = Width × Thickness × Length × ρ
W = Width · T = Thickness · L = Length · ρ = Density
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How Flat Bar Weight Is Calculated
A flat bar (also called MS patti) has a simple rectangular cross-section, making it one of the easiest metal products to calculate by formula. The weight formula is: Weight = Width × Thickness × Length × Density, where all dimensions are in metres and density is in kg/m³.
For Mild Steel (density 7,850 kg/m³), a quick shortcut formula is: Weight (kg) = Width (mm) × Thickness (mm) × Length (m) × 0.00785. This avoids the need to convert every dimension to metres individually. The constant 0.00785 comes from 7850 / 1,000,000.
Worked Example — 50 × 6mm MS Flat Bar, 6m Length
Using the shortcut formula:
- Weight = 50 × 6 × 6 × 0.00785
- Weight = 1800 × 0.00785 = 14.13 kg per piece
- Weight per metre = 50 × 6 × 0.00785 = 2.355 kg/m
This calculator automatically converts all millimetre inputs into SI units and supports 14 materials — select the material from the dropdown to use the correct density value.
MS Flat Bar Weight Chart — Common Sizes
Pre-calculated weight per metre for commonly used MS flat bar sizes. All values use Mild Steel density of 7,850 kg/m³. For other materials, multiply the MS weight by the density ratio (e.g. × 1.0102 for SS 304).
| Size (W × T) | kg/m | 6m Piece (kg) | 12m Piece (kg) |
|---|---|---|---|
| 20 × 3 mm | 0.471 | 2.83 | 5.65 |
| 25 × 3 mm | 0.589 | 3.53 | 7.06 |
| 25 × 5 mm | 0.981 | 5.89 | 11.77 |
| 32 × 5 mm | 1.256 | 7.54 | 15.07 |
| 40 × 5 mm | 1.570 | 9.42 | 18.84 |
| 40 × 6 mm | 1.884 | 11.30 | 22.61 |
| 50 × 5 mm | 1.962 | 11.77 | 23.55 |
| 50 × 6 mm | 2.355 | 14.13 | 28.26 |
| 50 × 8 mm | 3.140 | 18.84 | 37.68 |
| 65 × 6 mm | 3.061 | 18.37 | 36.74 |
| 75 × 6 mm | 3.532 | 21.20 | 42.39 |
| 75 × 8 mm | 4.710 | 28.26 | 56.52 |
| 75 × 10 mm | 5.887 | 35.32 | 70.65 |
| 100 × 6 mm | 4.710 | 28.26 | 56.52 |
| 100 × 8 mm | 6.280 | 37.68 | 75.36 |
| 100 × 10 mm | 7.850 | 47.10 | 94.20 |
| 100 × 12 mm | 9.420 | 56.52 | 113.04 |
| 150 × 10 mm | 11.775 | 70.65 | 141.30 |
| 150 × 12 mm | 14.130 | 84.78 | 169.56 |
Common supply lengths are around 5.5–6m (longer on order). Flat sizes are listed in IS 1731; actual weight varies within the rolling tolerances of IS 1852.
Common Applications of MS Flat Bars
Flat bars are one of the most versatile steel products in fabrication and construction. In structural steelwork, they serve as gusset plates, stiffener plates, base plate shims, and connection cleats. Flat bars welded to the flanges of beams act as cover plates to increase the bending capacity of under-strength sections without replacing the entire beam.
In general fabrication, flat bars are used for gate frames, window grills, shelving brackets, machinery guards, and conveyor guides. Thinner flat bars (3–5mm) are commonly used for decorative ironwork, while thicker sections (10–25mm) serve as machine base components and wear strips.
In the electrical industry, copper and aluminium flat bars (bus bars) carry high-current electrical connections in switchgear panels, transformers, and power distribution boards. The weight calculation formula is identical — only the material density changes. Select Copper (8,940 kg/m³) or Aluminium (2,700 kg/m³) from the material dropdown.