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Changelog

New calculators, features and fixes, newest first.

  1. October 2026

    Pile design from CPT, lateral capacity and Vs30

    • New

      CPT Pile Capacity: axial capacity straight from a CPT sounding by the LCPC and Eslami–Fellenius methods, with shaft resistance by layer and capacity against pile length.

      CPT Pile Capacity
    • New

      Lateral Pile Capacity (Broms): ultimate lateral load in clay or sand for free- and fixed-head piles, with a steel pipe yield-moment helper.

      Broms Lateral Capacity
    • New

      Shear Wave Velocity & Vs30: Vs profile from SPT or CPT correlations, with ASCE 7-16/NBCC, ASCE 7-22 and Eurocode 8 site classes.

      Shear Wave Velocity (Vs30)
    • Improved

      Seismic Site Classification opens with the Vs30 from the shear wave velocity tool already filled in.

      Seismic Site Classification

  2. Sheet piles, seismic earth pressure and unit conversion

    • New

      Sheet Pile Wall Design: embedment, maximum moment and anchor force for cantilever and anchored walls (free and fixed earth support), with hydrostatic or seepage water pressures.

      Sheet Pile Wall
    • New

      Seismic Earth Pressure (Mononobe–Okabe): active and passive coefficients, dynamic increment, resultant height and failure wedge.

      Seismic Earth Pressure
    • New

      Geotechnical Unit Converter: pressure, unit weight, permeability, cv, forces, moments and more, in a new Units & Reference category.

      Unit Converter
    • New

      NPPE Practice Exam: 550+ questions on ethics, professionalism, law and contracts. Pick topics and length, bookmark questions, no sign-up.

      NPPE Practice Exam
    • Improved

      Clearer cookie choices: Reject or Customize choices, as well as Accept.

  5. September 2026

    • Fixed

      The Print settings panel no longer runs off the screen on narrow phones.

    • Improved

      Deep Foundation Axial Capacity: rock-socketed drilled shafts, with socket side shear and GEC-10 or CFEM end bearing.

      Deep Foundation Capacity
    • Improved

      Print settings: choose which sections (inputs, results, calculation, theory) go on the printed sheet.

    • Improved

      Cleaner formula cards and typeset maths throughout the calculation steps; better contrast in dark mode.

    • Fixed

      Sorting by Newest now lists the newest tools first.

  7. Redesign and printable calculation sheets

    • New

      Print or save any calculation as a PDF sheet with your project, reference, prepared-by and checked-by details, on A4 or Letter.

    • Improved

      A cleaner design, with every tool split into Inputs, Results, Calculation and Theory sections, and a new logo.

    • Improved

      Driven piles and drilled shafts are now one tool: Deep Foundation Axial Capacity.

      Deep Foundation Capacity
    • New

      Cookie consent with separate choices for analytics and personalized ads.

    • Fixed

      Pile Group Efficiency: force and pressure labels and imperial conversions.

      Pile Group Efficiency
    • New

      Drilled shaft design by O'Neill & Reese (1999) / FHWA GEC-10: clay, sand and IGM layers, belled bases and exclusion zones.

      Deep Foundation Capacity
    • Improved

      Rewritten disclaimer and privacy policy in plain language.

    • Improved

      Axial pile capacity: su and φ′ labelled in the layer table, and every input can be cleared.

      Deep Foundation Capacity
    • New

      Stereonet Plotter: planes and poles on an equal-area net, with figure export.

      Stereonet Plotter
    • New

      RQD & Core Recovery Log from drilling runs.

      RQD & Core Recovery
    • New

      Drawdown Analyzer: Cooper-Jacob transmissivity and storativity from pumping tests.

      Pumping Test Analysis
    • New

      Sort the tool list by name, category or newest; recently added tools are marked New.

    • Improved

      Chart legends show each line style, so multi-series figures read correctly in black and white.

    • Improved

      Step-by-step calculations on every calculator, and a Clear button that empties all inputs.

    • Improved

      USCS Classifier: organic-soil and fallback inputs in an advanced section, and clear error messages instead of blank results.

      USCS Soil Classifier
    • Fixed

      Inputs that could not be fully erased on several tools.

  14. August 2026

    • New

      AASHTO Flexible Pavement Design: structural number and layer thicknesses.

      Flexible Pavement Design
    • Improved

      The equations shown follow the options you tick.

    • Improved

      Cantilever Retaining Wall Stability: groundwater and uplift, a cross-section with earth pressure, bearing pressure, sliding and resisting forces, and detailed calculation steps.

      Retaining Wall Stability
    • New

      Step-by-step calculations on the first set of calculators.

    • Fixed

      Number formatting in input fields.

  17. Launch