Learn · guides
Calculator tutorials
One tutorial per calculator: what each input means with a typical value, how to read the result, the tabs, Find fixes, the calc sheet and the bending schedule. The RC beam has the full step-by-step tutorial; the others are short guides that grow into full tutorials one by one.
Short “how to use” pages for the most used calculators. Each one explains the inputs in plain words with typical values, how to read the result, the governing check and NOT CHECKED, and walks through a typical example in about two minutes. For the theory, see the courses; for full hand calculations, the worked examples.
RC beam calculator · full tutorialSpans, supports, loads and section; the governing check; NOT CHECKED; calc sheet and bending schedule.Pad footing calculatorColumn loads, base size and soil; bearing pressure; Optimise size; schedule and calc sheet.Steel member calculatorSection, grade, effective length and factored actions; resistances; the governing clause; take-off.Slab design calculatorSpans, edges and loads; the reinforcement plan and section cuts; the governing check; schedule.Wind load calculatorWind speed, terrain, size and roof; zone and local peak pressures; the overall force; schedule.Project board and scheduleOne drawing sheet and one bending schedule for the project; loads flow down; revisions and sharing.RC column calculatorSection, ULS loads and effective height; the N–M curve; headroom and lighter options; schedule.Punching shear calculatorColumn, slab and reaction; the face and control perimeter checks; punching links and their schedule.Retaining wall calculatorGeometry, soil and surcharge; sliding, overturning, bearing and slip circle; stem, toe and heel bars.Base plate calculatorPlate, anchors and loads; the regime; bearing, anchors and concrete cone; take-off.Fin plate connection calculatorBeam, plate, bolts and shear; the bolt group with its eccentricity; notches; take-off.Cold-formed purlin calculatorSpan, section, roof loads and restraint; uplift and the free flange; purlin schedule.Strip footing calculatorLoads per metre run, width and soil; bearing pressure; NOT CHECKED until the exposure is given.Combined footing calculatorTwo columns on one base or a strap; base sizing; hogging between the columns; schedule.Raft foundation calculatorRaft size, subgrade modulus and a column list; soil pressure, settlement and punching per column.Pile cap calculatorColumn load, pile layout and cap; pile reactions; the truss and tie force; anchorage.Pile capacity calculatorPile type and size, soil layers and water; shaft and base resistance; Rall for the pile cap.Slab on grade calculatorThickness, subgrade and mesh; rack-leg and storage loads; joints and quantities.Flat slab calculatorGrid, columns and loads; column and middle strips; punching at interior, edge and corner columns.Post-tensioned slab calculatorSpans, strands and loads; losses and balanced load; service and ultimate checks; punching.RC shear wall calculatorWall size, height and actions; short or slender; in-plane capacity, end strip and shear.Corbel calculatorGeometry, load and bearing; the strut and tie; enhanced shear; anchorage of the tie.Staircase calculatorStair type, steps, waist and ends; the flight load on plan; flight and landings.Crack width and deflection calculatorSpan, loads, section and bars; crack width; long-term deflection and the limit after partitions.End plate connection calculatorBeam, column, plate and bolts; the component method; moment and shear resistance.Eaves haunch calculatorRafter, column and haunch; the bolt rows and lever arm; gravity and uplift.Apex haunch calculatorRafters, pitch and haunches; two end plates; the joint resistance at the ridge.Cold-formed member calculatorSection, pair, lengths and actions; local, distortional and global buckling by DSM.Timber beam calculatorCodes, section, grade and loads; kmod per combination; LTB and final deflection.Masonry wall calculatorWall, unit, mortar and loads; fk, slenderness and β; wind on the panel; modular bricks.Lintel calculatorOpening, masonry above and loads; the load triangle and arching; anchorage and bearing.Section properties calculatorShapes and library sections; area, moduli, radius of gyration, J and Cw; comparison.Quick toolsBar area, anchorage and laps; a simple beam; dead load build-up; imposed loads.
A guide to using the calculator, not a design. Check every value against the current code and your own project, and have the design checked and signed by a registered professional engineer.
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