Pavement Design Calculator

Estimate flexible pavement layer thicknesses based on the AASHTO 1993 methodology.

Total ESALs (W₁₈)

Reliability (R %)

Overall Standard Deviation (S_o)

Design Serviceability Loss (ΔPSI)

Subgrade Resilient Modulus (M_R, psi)

Layer Properties

Asphalt Concrete Structural Coeff. (a₁)

Asphalt Concrete Drainage Coeff. (m₁)

Asphalt Min. Thickness (D₁, inches)

Base Course Structural Coeff. (a₂)

Base Course Drainage Coeff. (m₂)

Base Min. Thickness (D₂, inches)

Subbase Course Structural Coeff. (a₃)

Subbase Course Drainage Coeff. (m₃)

Subbase Min. Thickness (D₃, inches)