# Flexible Pavement Structural Number Calculator

Calculate your flexible pavement structural number with our easy-to-use calculator. Get accurate, reliable results quickly and easily.

Use this calculator to determine the structural number of a flexible pavement by inputting the thickness and layer coefficients of the asphalt, base, sub-base, and any additional layers.

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1
Number of calculations

L=a1ta + b1tb + c1tsb +d1tad

`L`

=Structural Number of Flexible pavement,

`a1`

=Layer coefficient for asphalt,

`ta`

=Asphalt layer thickness,

`b1`

=Layer coefficient of base,

`tb`

=Base layer thickness,

`c1`

=Layer coefficient of sub-base,

`tsb`

=Sub-base layer thickness,

`d1`

=Layer coefficient of additional layer,

`tad`

=Thickness of additional layer