Pile cap design

Pile-cap calculator + export PDF report

Produces stepwise calculations (flexure, shears, punching) and detailed printable report.

Inputs

Column width B_col (mm)

Column depth D_col (mm)

Factored column load P_u (kN)

Ultimate pile capacity (kN/pile)

Pile diameter D_p (mm)

Concrete grade f_ck (N/mm²)

Steel grade f_y (N/mm²)

Clear cover (mm)

Main (bottom) bar dia (mm) T25 (25 mm) T20 (20 mm) T28 (28 mm) T32 (32 mm)

Top bar dia (mm) T12 (12 mm) T16 (16 mm) T20 (20 mm)

Adopted pile-cap overall depth (mm) — auto suggested

Plan cap width (mm) — (for one-way shear checks)

Shear factor per pile (fraction) — (example used 0.39)

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Notes: formulas and interpolation for permissible shear stress t_c are taken from IS 456:2000 Table 19 (interpolated). The calculator mirrors the example in your uploaded PDF and shows step-by-step arithmetic for traceability.

Stepwise calculations & results

Click Compute to run calculations — results appear here, with detailed steps.

Tip: after computing, press Export detailed PDF to generate a printable report containing every numeric step.