Slope Stability Calculator
Analyze slope stability using the infinite slope method. Calculates factor of safety considering cohesion, friction, pore pressure, and slip depth.
Inputs
psf
°
°
pcf
ft
psf
Results
Factor of Safety
1.29
Stable (FoS ≥ 1.5)
0
Critical Slope Angle39.5°
Available Shear Strength536 psf
Driving Shear Stress416 psf
How to Use This Calculator
- Enter soil cohesion (psf or kPa), friction angle (°), slope angle (°), and soil unit weight.
- Set slip surface depth (ft) and pore water pressure (psf).
- Review Factor of Safety — values above 1.5 are generally considered stable for permanent slopes.
- Conduct a full Bishop's method or Spencer analysis for critical slopes before construction.
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