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Eccentric Isolated Footing Designer (IS 456:2000)

Eccentric Isolated Footing Designer —

IS 456:2000 • Total eccentricity (physical + load) for soil pressure • Governing physical spans for bending & one-way shear

Input Data

ParametersValueUnit
Concrete grade (fck)MPa
Steel grade (fy)MPa
Column size (a × b) × m
Service axial load NserkN
Service moments (Mx, My) , kN·m
Column position mode —
Physical eccentricities (ex, ey) , m
Edge distances (left, right) , m
Edge distances (top, bottom) , m
Suggest geometry (targets 0.95×SBC)—
Footing size (B × L) × m
Footing thickness (t)m
Main bar dia (ϕ bottom)mm
Top bar dia (ϕ top)mm
Dowel bar diamm
Clear covermm
Allowable SBCkN/m²
Eccentricities (ex, ey)
—
qmax / qmin (kN/m²)
—
d (mm) & ρt (%)
—

Codal Checks (IS 456) — OK / Not OK

CheckRule / ClauseUtilization & Key ValuesStatus

Bottom steel: X-direction

ParameterValueUnit
Design moment—kN·m/m
As,x required—mm²/m
Provide——

Bottom steel: Y-direction

ParameterValueUnit
Design moment—kN·m/m
As,y required—mm²/m
Provide——

Top steel near column (hogging)

ParameterValueUnit
Hogging moment — X—kN·m/m
As,top,x required / provided—mm²/m
Hogging moment — Y—kN·m/m
As,top,y required / provided—mm²/m
Top steel is shown only if computed hogging near the column requires it; otherwise minimum steel (0.12% each way) with matching spacing is displayed.

Design Calculation (preview)



Important Notes & Disclaimer

This design tool is based on the limit state provisions of IS 456:2000. Please double-check all inputs and the resulting checks before finalizing the design. Results are for informational purposes and must be reviewed and approved by a licensed professional engineer prior to use in construction. Report discrepancies to pic@civikruti.com.
Key / Definitions

Footing Dimensions (Overall):
  • B: The total width of the footing (typically along the X-axis).
  • L: The total length of the footing (typically along the Y-axis).

Column Dimensions:
  • a: The column width (along the B / X-axis).
  • b: The column length (along the L / Y-axis).

Physical Eccentricity (center-to-center):
  • ex: Horizontal distance from footing center to column center.
  • ey: Vertical distance from footing center to column center.

Edge Distances (edge-to-face):
  • left: From left edge of footing to left face of column.
  • right: From right edge of footing to right face of column.
  • bottom: From bottom edge of footing to bottom face of column.
  • top: From top edge of footing to top face of column.
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["B","L","t","a","b","fck","fy","cover","phi","phiTop","phiDowel","Nser","Mxser","Myser","SBC","colPosMode","ex_in","ey_in","left_in","right_in","top_in","bottom_in"].forEach(id=>{
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