In Rock Mechanics, determination of Unconfined Compressive Strength (UCS) of rock is of prime importance as its role in design and analysis of geotechnical problems is crucial. Though laboratory test is the most direct and easy way for estimating the rock compressive strength but UCS determination in the laboratory would be problematic. The laboratory test needs specimen of correct size and features. Obtaining such sample at a time is too difficult. Hence, there is no comprehensive solution to predict the UCS from Schmidt Rebound number. Researchers have developed several equations to make the process easier
