Free structural engineering calculators
Design beams, columns, slabs, footings, walls, steel members and connections — to SANS, BS 8110 and Eurocode — with live diagrams, full code checks and printable calc sheets. Free.
The full STATIX 3D modeller
Model the whole frame in 3D, then run the analysis and the member, RC and foundation design in one offline tool — no per-module licences. Connection design is in development and not in the current build. The calculators below are free standalone tools; the full suite is in development.
Concrete
RC Beam
Span + loads → shear/moment/deflection diagrams, reinforcement detailing, continuous spans and full ULS/SLS checks.
RC Column
Axial + biaxial moment on a live N-M interaction diagram, reinforcement section, short/slender and steel checks.
Pad Footing
Least-cost plan size, soil bearing-pressure diagram, flexure, one-way and punching shear, all auto-sized.
Pile Cap
2/3/4-pile caps under column load — pile reactions, truss (strut-and-tie) banded reinforcement, beam & punching shear and bar anchorage.
Two-Way Slab
Finite-difference plate solver — Mx / My moment fields, colour contours, top & bottom steel each way and deflection.
Flat Slab Punching Shear
Control perimeters around internal, edge and corner columns, with the shear-stud layout and the perimeter where reinforcement is no longer needed. Printable calc sheet.
Hollow Core Slab
Prestressed pre-tensioned units — losses, transfer and service stresses, ultimate moment, shear along the span, camber and maximum span.
Crack Width & Deflection
Standalone SLS check — flexural crack width and long-term (creep + shrinkage) deflection for RC beams and slabs, by both the BS and EN methods.
Retaining Wall
Cantilever wall — earth-pressure diagram, overturning / sliding / bearing factors of safety and RC design.
Steel members
Steel Member
Compression, bending and shear resistances with an N-M interaction curve and beam-column check for UB/UC sections.
Cold-Formed Steel
Member capacity where you supply the actions — axial, biaxial moment and shear, with independent effective lengths about each axis and for torsion. Columns, beams and back-to-back pairs, local, distortional and global buckling, with the elastic buckling loads shown.
Cold-Formed Purlin
Roof purlins designed from loads rather than actions — span, purlin spacing and the dead, imposed and wind cases, uplift included, with restraint from the sheeting. Local, distortional (Lau & Hancock, CUFSM-validated) and global buckling, shear, combined action and deflection.
Steel connections
Base Plate
Column base under N + M — bearing pressure, effective area, anchor tension with concrete cone and weld checks.
End-Plate Connection
Bolted moment end-plate — T-stub bolt-row resistances, column-web checks and the joint moment resistance Mj,Rd.
Eave Haunch
Portal-frame eaves haunch — deepened end-plate connection with the lever-arm gain and haunch-flange compression.
Apex Haunch
Portal-frame ridge — symmetric rafter-to-rafter haunched end-plate connection with the lever-arm gain, no column.
Fin-Plate (Shear)
Bolted fin-plate shear connection — eccentric bolt group, plate shear / bending / block tearing and the fillet weld.
Timber and masonry
Timber Beam
Sawn or glulam beam — bending with lateral-torsional stability, shear, bearing and instantaneous/creep deflection. Grade stresses are your inputs.
Masonry Wall
Loadbearing wall — characteristic strength, slenderness & eccentricity capacity-reduction factor, vertical resistance and lateral (wind) bending.
Loading and geometry
Wind Load
Peak velocity pressure, terrain exposure and external/internal pressures on every wall and roof zone.
Section Properties
Area, second moments, radii of gyration, elastic & plastic moduli, torsion and warping — any section or a library profile.
These aren't toy calculators
Each one shows its working and names the clause behind every number, the way a calc sheet submitted for checking has to. The 3D modeller is next.
Early access to STATIX 3D
The calculators above are free and open — make an account and start. This list is for STATIX 3D and the AutoCAD reinforcement detailing, which are still being built. Leave your email and we will tell you when they are testable. One confirmation now, one message then. Nothing else.
The calculators stay free · a confirmation now, one message when 3D is testable