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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

Pavement Thickness Design Calculator

Estimate the required pavement thickness for roads or parking lots based on traffic volume, subgrade strength, and design life. Essential during roadway design to prevent premature structural failure.

Daily Traffic (ADT) (vehicles/day)

Design Life (years)

Subgrade CBR (%)

Pavement Type

Fill in the required fields to see your result.

Key differences

	Slope Stability Factor of Safety Calculator	Pavement Thickness Design Calculator
Category	Civil	Civil
Inputs required	5	4
Result	Factor of Safety	Required Thickness (inches)
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.	Estimate the required pavement thickness for roads or parking lots based on traffic volume, subgrade strength, and design life. Essential during roadway design to prevent premature structural failure.