Free RC beam calculator to SANS 10100
Designs a reinforced concrete beam for bending, shear, torsion and deflection, from a simple span to eight continuous spans. Free, runs in your browser, and prints a calc sheet with clause references.
No install, no card. The result shows without an account; a free account opens every check with its clause, the calc sheet and the bending schedule for 3 designs a month (one calculator, 24 hours). Calculator packs, coming soon, remove the limit.
What the calculator checks.
Every check is shown with the working, the clause and a pass or fail.
- Simply supported, cantilever, fixed, propped and continuous beams up to eight spans, with shear force and bending moment diagrams
- Bending (SANS 10100 cl. 4.3.3.4): K against K′, lever arm, As,req and the bars that fit in one or more layers
- Shear (cl. 4.3.4): v against vc and vmax, with link size and spacing
- Deflection by span/depth ratio (cl. 4.3.6), minimum and maximum steel, bar spacing
- Crack width (BS 8110-2 eq. 3) and long-term deflection by the curvature method
- Rectangular, T, L, inverted T and L, and I sections; support reactions with an equilibrium check
- On the STATIX beam engine: anchorage of bars ending in a column, laps (cl. 4.11.6.6) and crack-control bar spacing (cl. 4.11.8.2)
- Torsion (cl. 4.3.5): equilibrium or compatibility torsion, with torsion links and longitudinal steel, including the flanges of T and L beams
- Bars you can edit on the drawing: drag, curtail or add a bar and the beam engine checks the edited bars again
Codes: SANS 10100-1, BS 8110, Eurocode 2 (EN 1992-1-1)
A tool to check a design, not a design approval. Check the results and have the design signed by a registered professional engineer.
Short answers.
About this free calculator.
Is the RC beam calculator free?
Yes. It is free to use: enter your own values and every check shows on the page with its result.
Do I need an account?
No account is needed to use it: every check shows on the page with its result and clause, with a calc sheet summary. Without an account you see the result. A free STATIX account (email or Google, no card) opens every check with its clause, the full calc sheet to print or save as a PDF and the SANS 282 bending schedule for 3 designs a month (one calculator, open for 24 hours). Paid plans, coming soon, will make them unlimited.
Which code clauses does it use?
The calc sheet names the clause on every step: SANS 10100 cl. 4.3.3.4 for bending, cl. 4.3.4 for shear and cl. 4.3.6 for deflection, and BS 8110-2 eq. 3 for crack width. Choose BS 8110 or Eurocode 2 and the sheet follows that code.
Be first to use STATIX 3D and STATIX 2D.
Leave your email and we will tell you when each part is ready for testing. One confirmation now, one message then. A short monthly update only if you tick the box.