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CBR → Mr & k-value
Convert CBR to resilient modulus (AASHTO 1993 and MEPDG) and modulus of subgrade reaction k, and get CBR from a DCP test.
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About this test
Enter a soaked CBR — or a DCP penetration index — to get Mr for flexible pavements and the k-value for rigid pavements, rafts and slab-on-grade models.
How it's calculated
- Mr (psi) = 1500 × CBR (AASHTO 1993)
- Mr (psi) = 2555 × CBR^0.64 (MEPDG)
- k (pci) = 28.69 × CBR^0.7788
- log CBR = 2.465 − 1.12 log DCPI (ASTM D6951)
Results are calculated from the values you enter using standard formulas. Download the PDF to keep a record. For certified testing, design or construction, talk to our engineers.
Cite this tool
Kataria Engineering & Consultancy Services (2026). CBR → Mr & k-value [online calculator]. https://katariaengineering.com/tools/cbr-resilient-modulus-k-value.html
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