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eng.retaining-wall-overturning Calculator
Calculates overturning moment, resisting moment, and factor of safety against overturning for a cantilever or gravity retaining wall. Factor of safety against overturning must be ≥2.0 for most codes — this is often the controlling design criterion for tall cantilever walls.
Inputs
Wall Height M
Vertical measurement. For health calculators, typically standing height without shoes.
Base Width M
Horizontal extent perpendicular to the length.
Backfill Unit Wt Kn M3
Body or object weight. For health calculators, usually in kg or lbs.
Soil Friction Angle Deg
Reference formula or conversion factor shown for context.
Surcharge Kn M2
Reference formula or conversion factor shown for context.
Results
active earth pressure Ea (kN/m)
Sample size or count used in the calculation.
Ka coefficient
Sample size or count used in the calculation.
overturning moment (kN·m/m)
Sample size or count used in the calculation.
FOS overturning (rough)
Sample size or count used in the calculation.
Rankine Ka = (1-sinφ)/(1+sinφ)
The position in an ordered list, from best to worst or lowest to highest.
minimum FOS overturning
The smallest value in the dataset or feasible range.