Cantilever Retaining Wall Calculator
Cantilever retaining-wall design to SANS 10100 / BS 8110 with Rankine and Coulomb earth pressure. Enter wall geometry, soil φ/γ, surcharge and water table for a live wall cross-section, the lateral earth-pressure diagram, overturning / sliding / bearing factors of safety, stem & base reinforcement and a printable step-by-step calc sheet.
Runs the validated STATIX earth-pressure engine — Coulomb collapses exactly to Rankine when δ=0
Inputs
Wall
Design code
Wall geometry
m
m
m
m
m
m
m
°
m
Soil & loading
°
kN/m³
°
°
kPa
m
kPa
Passive resistance (toe)
kN/m³
°
Base & materials
kPa
MPa
MPa
kN/m³
mm
mm
Per-zone steel optional — Auto uses the computed size/spacing; a fixed pick is checked and FAILS honestly if under-provided
Wall cross-section
Lateral earth pressure on stem+heel plane
Design result
—
—
enter geometry
| Active Ka | — |
| Horizontal thrust Pah | — |
| Overturning FoS | — |
| Sliding FoS | — |
| Vertical load ΣN | — |
| Eccentricity e | — |
| Bearing qmax / qmin | — |
| Stem / toe As,req | — |
Reinforcement
Design checks
Step-by-step calculation
Combined bending schedule — all walls
Every wall in the project, aggregated. Marks are prefixed with each wall name and scheduled per 1 m run of wall — multiply bar numbers by the wall length. Use “Add wall” above to build the full schedule, then Download PDF (print → Save as PDF). SANS 282:2004 shape codes; cutting lengths nominal (anchorage/laps to detailer).
This isn't a toy calculator
It runs the same engine as STATIX — a full structural suite built on the same engine. Model the whole retaining structure, not just one section.