Deep-foundation analysis,
in your browser.
Laterally loaded piles, axial capacity & settlement, groups, drilled shafts and footings — the complete deep-foundation toolbox, with a genuinely modern UI and an explanation behind every single input. No Windows. No dongles.
Free to try — runs on any Mac, Windows, Linux or Chromebook.
Built on the methods the profession already trusts
The whole deep-foundation toolbox
The desktop incumbents split this across four separate programs. PileCalc puts it in one place — every method documented, every assumption visible.
Laterally loaded piles
Deflection, slope, moment, shear and soil reaction by the p-y finite-difference method. Five head conditions, static or cyclic, layered soil, pushover load sweeps, cracked-section nonlinear EI.
FHWA COM624P / Reese p-y
Axial capacity & settlement
Downward and uplift capacity, limiting depth, Vesić settlement, and the full t-z / q-w load–settlement curve — with a dedicated neutral-plane downdrag tool alongside.
NAVFAC DM-7.02 · Vesić
Pile groups
Vertical ultimate/block resistance with explicit ASD, LRFD and sand-group service settlement; FHWA GEC 9 row p-multipliers laterally.
FHWA GEC 12 / GEC 9 · USACE EM 1110-2-2906
Drilled shafts
α / β / rock side resistance, clay / sand / rock tip bearing, exclusion zones, and belled-base uplift.
FHWA-IF-99-025
Shallow footings
General bearing equation with biaxial effective dimensions and full-contact rejection; elastic settlement, base-friction sliding and rotation.
Das / Vesić
Uplift plates & anchors
Shallow and deep breakout in sand and clay, plus grouted-anchor adhesion capacity.
AllPile §8.4–8.5 · Das
Moment–curvature
M–φ and nonlinear EI for solid-circular, pipe and rectangular steel sections by fiber integration — feeds cracked-section lateral runs.
Fiber integration
Slope stabilization
Demand/capacity across trial slip surfaces for an explicit row of stabilizing piles, resolved into lateral and axial components; wide-spacing rows are analyzed independently.
Applied displacement · independent wide-spacing row
Capacity vs length
Axial capacity swept over embedment length — side, tip, downward and uplift curves, with the required length for a target load read off directly.
NAVFAC DM-7.02 swept over L
Torsional capacity
Drilled-shaft shaft/toe torsional capacity plus calibrated monotonic torque–rotation, depth transfer, and service stiffness — for mast arms, signs and other torque-loaded foundations.
FHWA-OR-RD-16-14 Florida District 7 / CDOT
Downdrag / negative skin friction
Neutral-plane analysis under an imposed ground-settlement profile: dragload, neutral plane depth, and the full axial force and settlement profiles.
Fellenius unified · FHWA GEC-12
Foundation stiffness (springs)
Signed reciprocal lateral–rotation tangent matrix plus explicit vertical secant and tangent stiffness at the specified service state.
Exact Winkler matrix · FHWA refined-analysis manual · GEC 12
Pile buckling
First elastic generalized eigenvalue and signed mode with partial embedment, variable EI, explicit end restraints, and mesh evidence.
NCHRP 343 · Davisson & Robinson (1965)
Helical piles
Individual-bearing and cylindrical-shear capacity with per-helix bearing and the AC358 torque correlation.
Perko (2009) · ICC-ES AC358
Rigid and structural pile cap
Explicit load combinations, CPGA-style pile reactions, and AASHTO-2002 flexure, one-way shear, punching, reinforcement, and governing utilization checks.
Saul/USACE CPGA · FHWA NHI-04-041
Every input explains itself
Each setting carries a little (i) button. Click it for a plain-language definition, why it changes the answer, and typical values — so a first-time user and a seasoned geotechnical engineer both move fast. Try them →
↑ These info buttons are live. Click one.
The same equation LPILE solves — shown, not hidden
PileCalc solves the beam-column-on-nonlinear-foundation equation by finite differences, iterating the secant soil modulus to convergence. You can see the governing equation, the p-y curves, and the node-by-node response behind every result.
Discretized by central finite differences into a pentadiagonal system and solved by Picard iteration on the secant modulus Eₚᵧ = p/y until the deflection field converges.
The breadth of AllPile. A UI from this decade.
Browser-based lateral analysis exists elsewhere — but no one pairs the full deep-foundation breadth with a modern, explained, shareable workspace.
The full feature-by-feature table is best viewed on a larger screen.
Benchmarked against two independent codes
The engine is checked term-by-term against the RSPile theory manuals — matching closed-form and printed-table benchmarks to a fraction of a percent, and chart-published LPILE cases within reading tolerance. Matching two independent implementations — not one — is how you know it isn't reproducing a single vendor's quirks.
These are lateral-pile cases; every tool — from axial capacity, drilled shafts, footings, groups, moment–curvature, slope and uplift to torsion, downdrag, buckling, helical piles and the rigid pile cap — is benchmarked the same way. See the full per-tool validation report →
Questions, answered
Run your first analysis in the next two minutes.
Open the app, drop in a pile and a soil profile, and watch the deflected shape and moment diagram appear — with every input explained as you go.