Pavement Thickness Calculator – Determine Road Pavement Layer

Accurate pavement thickness is essential for durable road construction. This calculator estimates required thickness of subgrade, sub-base, base, and bituminous layers based on traffic load and CBR values.

Pavement Thickness Calculator Tool

Formula

Pavement Thickness (mm) ≈ (Traffic MSA / Subgrade CBR %) × 100

Example

Traffic = 5 msa, CBR = 5% → Thickness ≈ 100 mm (subgrade & base combined)

Applications

• Highway flexible pavement design
• Road rehabilitation and overlay planning
• Airport and heavy-duty pavements

Standards Reference

• IRC:37 – Flexible Pavement Design
• MORTH Guidelines – Pavement Layer Thickness

FAQs

What is the standard thickness of highway pavement?

Depends on traffic load, subgrade strength, and material. Flexible pavements often range 150–300 mm total thickness.

Conclusion

This Pavement Thickness Calculator allows engineers to quickly estimate the required pavement layers, ensuring durability and compliance with IRC/MORTH guidelines.