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Steel Quantity Calculator (2026) – Slab, Beam, Column, Footing

Expert Guide
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Estimate total reinforcement steel needed for specific structural components based on concrete volume or exact bar spacing. Ideal for site-ready rebar counts.

Reinforcement steel mesh being laid for a concrete floor slab

⚡ Quick Answer

Structural steel is estimated as a % of concrete volume (Thumb Rule) or by exact spacing (Field Method). Slabs use 80-100 kg/m³, columns 120-250 kg/m³. For shop drawings, visit pro.nirmansutra.com.

🛠️ How It Works

  • •Select the component (Slab, Beam, Column, or Footing).
  • •Enter the dimensions to calculate the concrete volume.
  • •Adjust the steel percentage (%) based on engineering thumb rules.

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Rebar Weight Calculator

⚡ Precise TMT estimation

Calculate TMT bar weight (kg/tonne), running length, and number of bars by spacing. Standard D²/162.2 density support.

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⚠️ Common Mistakes to Avoid

  • ✕Using the same 1% steel for both Slabs and Columns — Columns typically require 2-3% in seismic zones like Nepal.
  • ✕Ignoring overlap (lap length) — in reality, total steel consumption is 5-10% higher than net thumb rules due to laps.

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❓ Frequently Asked Questions

As a thumb rule, a residential slab needs 80kg to 100kg of steel per cubic meter of concrete. For 1000 sq.ft (150mm thick), expect approx 1,200kg to 1,500kg of rebar.
According to IS 456, columns typically require 1.5% to 3.0% and beams require 1.0% to 2.0% of the total concrete volume.
To avoid a plane of weakness, never lap more than 50% of bars at the same floor level.

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