Number of correlations between SPT N and soil parameters are available. Consequently SPT N value of soil has variety of geotechnical applications. Soil could be cohesion-less, cohesive or intermediate. Cohesion-less soils have close to zero cohesion (less than 5 kPa). Intermediate soils have more than 5 kPa cohesion with 75micron finer less than 50%. Cohesive soils have more than 12 kPa cohesion with 75micron finer more than 50%. Equation is available to determine estimated value of SPT N, knowing angle of internal friction value of cohesion-less and cohesion of cohesive as well as of intermediate soils. Cohesion and angle of internal friction is determined using direct shear or triaxial testing, requiring complicated experimental set-up. Simple alternative of estimating them is advisable. In this study ultrasonic P wave propagation through Pilani soil at five different silty clay contents has been used for this purpose. Cohesion, angle of internal friction and percent finer than 75micron information for them have been used to classify soil. Estimated value of SPT N has been determined using applicable equations and ultrasonic P wave velocity has also been determined for them. Their variation with silty clay content can be used as calibration curve. 300micron sieved soil from other sites of same region can be taken. Ultrasonic P wave velocity through it can be determined and estimated value of SPT N can be obtained from the calibration curve. For some sites, additionally 150micron sieved soil information will also be required to obtain estimated value of SPT N.