Geotechnical Tools

Search and use practical engineering calculators. Outputs are preliminary and intended for education, concept screening, and assumption testing.

<- Back to all tools

Soil Parameters

Standard Penetration Test (SPT) Corrections for N60 and (N1)60

Corrected SPT resistance is obtained through the standard energy and equipment correction sequence, followed by the selected overburden method after Peck et al. (1974) or Liao and Whitman (1986).

Units

Inputs

Enter values and run the calculator.

Overburden correction method, C_N

Recorded SPT N

Hammer energy ratio, ER(%)

Borehole diameter factor, Cb

Rod length factor, Cr

Sampler factor, Cs

Vertical effective stress, σ'v0(kPa)

Important disclaimer

These results are simplified and indicative only. Please review the site-wide Disclaimer before using this tool in any engineering workflow.