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Rebar Detailing Calculator (2026) – Cutting Length & Stirrups

Expert Guide
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Get millimetre-perfect cutting lengths for reinforcement bars and stirrups. See Rebar Master for simple weight estimation.

Detailing of steel stirrups and ties at a column-beam junction

⚡ Quick Answer

Cutting length must always subtract concrete cover and bend deductions. A 4m beam with 25mm cover and 9d hooks needs a 4.16m cut piece.

🛠️ How It Works

📐 Calculation Formula

Cutting Length = L - 2(Cover) + Hooks - Bend Deductions
Bend Deduction = 2d (90°), 3d (135°)
Rebar Detailing & Hook Bending Diagram

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⚠️ Common Mistakes to Avoid

  • ✕Forgetting to subtract concrete cover from ALL sides of a stirrup.
  • ✕Using 10mm stirrups without checking if 8mm is sufficient — this increases steel cost by 50% for ties.

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❓ Frequently Asked Questions

Cutting Length = Perimeter of Ring + (2 × Hook Length) - (Total Bend Deductions). Use 10d for 135-degree seismic hooks.
When rebar is bent 90°, it elongates. Subtract 2 × Diameter (2d) for every 90° bend to get the actual cutting length.
Seismic codes (IS 13920) mandate 135° hooks to prevent stirrups from opening during earthquakes, providing better core confinement.

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