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Both calculators run independently — change the inputs on either side to compare results.

Slope Stability Factor of Safety Calculator

Determine whether a soil slope is safe against sliding by computing the Factor of Safety (FS) using the simplified Bishop method. Use this when designing embankments, road cuts, or evaluating landslide risk.

Slope Angle (degrees)

Slope Height (ft)

Soil Cohesion (psf)

Internal Friction Angle

Soil Unit Weight (pcf)

Fill in the required fields to see your result.

Civil

Flexible Pavement Thickness Calculator

Compute the required flexible pavement structural number using the AASHTO 1993 empirical design method. Used by pavement engineers to size asphalt road sections for a given traffic load, subgrade strength, and reliability level.

Design ESALs (applications)

Reliability Level

Subgrade CBR (%)

Serviceability Loss

Fill in the required fields to see your result.

Key differences

	Slope Stability Factor of Safety Calculator	Flexible Pavement Thickness Calculator
Category	Civil	Civil
Inputs required	5	4
Result	Factor of Safety	Structural Number Required (SN)
What it does	Determine whether a soil slope is safe against sliding by computing the Factor of Safety (FS) using the simplified Bishop method. Use this when designing embankments, road cuts, or evaluating landslide risk.	Compute the required flexible pavement structural number using the AASHTO 1993 empirical design method. Used by pavement engineers to size asphalt road sections for a given traffic load, subgrade strength, and reliability level.