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Calcimator

Pavement Thickness Calculator

Design flexible pavement thickness using a simplified AASHTO 1993 method. Calculates required structural number and layer thicknesses for asphalt, base, and subbase.

Inputs

AASHTO 1993: local road logESAL 5–6; arterial 6–7; interstate/highway 7–8

psi

AASHTO T307/Mr=1500Γ—CBR: soft clay 3,000 psi; stiff clay 8,000 psi; sand/gravel 15,000–20,000 psi

Results

Required Structural Number

3.9

Asphalt Surface

4 in

Total Pavement Thickness

21 in

Aggregate Base10 in
Subbase7 in
How to Use This Calculator
  1. Enter design ESALs (log₁₀), desired reliability level, and serviceability loss.
  2. Set resilient modulus and other layer parameters.
  3. Review required pavement thickness (inches) per AASHTO 1993 design guide.
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