Pile Capacity Calculator (Static Method)

End bearing + skin friction capacity of a single pile.

Pile diameter (mm)Pile length (m)Average skin friction (kPa)Soft clay 15–25 · stiff clay 40–70 · medium sand 30–60End bearing resistance (kPa)Stiff clay 9·c_u · dense sand 5–10 MPaFactor of safety

Skin friction share (kN)

End bearing share (kN)

Allowable pile load (kN)

Friction piles mobilize skin at ~5–10 mm movement, the base needs 10× more — they don't peak together. A 500Ø×15 m pile in stiff clay ≈ 55–60 t allowable; load test to be sure.

Formula

Q_u = π·D·L·f_s + (πD²/4)·q_b; Q_a = Q_u/FS

References: IS 2911; Tomlinson pile design

Pile Capacity Calculator (Static Method) is a free pile capacity for geotechnical engineers and foundation designers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.

About Pile Capacity Calculator (Static Method)

End bearing + skin friction capacity of a single pile. The calculation implements Q_u = π·D·L·f_s + (πD²/4)·q_b; Q_a = Q_u/FS (IS 2911; Tomlinson pile design). Friction piles mobilize skin at ~5–10 mm movement, the base needs 10× more — they don't peak together. A 500Ø×15 m pile in stiff clay ≈ 55–60 t allowable; load test to be sure.

How to use Pile Capacity Calculator (Static Method)

1Enter Pile diameter in mm.
2Enter Pile length in m.
3Enter Average skin friction in kPa (Soft clay 15–25 · stiff clay 40–70 · medium sand 30–60).
4Enter End bearing resistance in kPa (Stiff clay 9·c_u · dense sand 5–10 MPa).
5Read Skin friction share, End bearing share, Allowable pile load instantly — no submit button needed.
6Need US units? Flip the SI/Imperial toggle and every field converts.

Why use Pile Capacity Calculator (Static Method)?

✓Implements the standard formula — Q_u = π·D·L·f_s + (πD²/4)·q_b; Q_a = Q_u/FS
✓Reference cited on-page: IS 2911; Tomlinson pile design
✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
✓Live worked example: the substitution recomputes from your numbers
✓Runs entirely in your browser — nothing uploaded, free forever

Frequently asked questions

What formula does the Pile Capacity Calculator (Static Method) use?+

It computes Q_u = π·D·L·f_s + (πD²/4)·q_b; Q_a = Q_u/FS, per IS 2911; Tomlinson pile design. The formula is displayed under the result along with a worked example substituted with your own inputs.

What should I keep in mind when using this calculator?+

Friction piles mobilize skin at ~5–10 mm movement, the base needs 10× more — they don't peak together. A 500Ø×15 m pile in stiff clay ≈ 55–60 t allowable; load test to be sure.

Can this replace a soil investigation?+

No calculator replaces boreholes and lab tests — but with investigated parameters in hand, this gives you the standard-method result instantly, with the formula shown so reviewers can check it.

Is the Pile Capacity Calculator (Static Method) free to use?+

Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.

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