Free calculatorsRC Column Design Calculator
Multi-code reinforced-concrete column design — SANS 10100, BS 8110 and Eurocode 2. Enter axial load and biaxial moments for a live N–M interaction diagram, the reinforcement section, short/slender and steel checks and a printable step-by-step calc sheet.
SANS/BS use the validated STATIX engine — verified against 221 benchmarks; Eurocode 2 per EN 1992-1-1
Inputs
Column
Design code
Section geometry
mm
mm
mm
Design actions (ULS)
kN
kNm
kNm
kN
Slenderness
m
Materials
MPa
MPa
Column section
Reinforcement — 3D member
N–M interaction diagram
Design result
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—
enter actions
| Axial NEd | — |
| Design moment MEd | — |
| Squash load Nuz | — |
| Moment capacity MRd @ N | — |
| Slenderness | — |
| Steel Asc,req | — |
| Bars provided | — |
| Links | — |
Reinforcement
Design checks
Step-by-step calculation
Combined bending schedule — all columns
Every column in the project, aggregated. Marks are prefixed with each column name. Use “Add column” above to build the full schedule, then Download PDF (print → Save as PDF). Vertical-bar length taken as the effective height le; set a starter-bar shape (20 straight / 37 L-bar / 38 crank) per column. Cutting lengths per SANS 282:2004 (nominal).
221
This isn't a toy calculator
It runs the same engine as STATIX — a full structural suite validated against 221 closed-form and code benchmarks across analysis, design and connections — the full 3D modeller with native CBFEM is coming soon. Model the whole building, not just one column.