1 beam

Beam Size Calculator — IS 13920: Ductile Detailing Guidance

Quick recommendation: D = L/12 to L/10, b ≈ D/1.5, and b ≥ 200 mm. This expands with checks, effective depth and expert notes.

Clear Span L (meters)

Preferred depth selection Auto (mid of L/12 and L/10) L/12 (shallow) L/10 (deep) Custom depth (mm)

Custom overall depth D (mm)

Clear cover (mm)

Stirrup dia (mm)

Main bar dia (mm)

Min beam width (mm)

Width selection rule Width = D / 1.5 Fixed width (mm)

Fixed width b (mm)

Outputs

No calculation yet.

Cross-section preview

Illustrative only

Engineer notes

• IS 13920 covers ductile detailing for seismic resistance.
• Depth from span ratio is only a starting point; verify by bending & shear design.
• Effective depth = D - (cover + stirrup dia + 0.5 × main bar dia).
• Always check serviceability and seismic detailing requirements.

Prepared as an expert aid — not a substitute for full IS 456/IS 13920 design.