<p>Rock Quality Designation serves as a reliable geomechanical parameter extensively utilized in geotechnical projects in surface and subsurface excavations. Traditionally, RQD is derived from rock cores obtained from boreholes. However, the conventional methods used for this purpose are characterized by being time-consuming, costly, providing only point-scale measurements, and being constrained by topographic limitations. This study focuses on the application of various empirical equations for RQD using tunneling data along the Himalayas. It was observed that many equations exhibit significant variations when RQD is less than 50%. Similarly, equations suggested for RQD through geophysical methods encounter limitations when RQD exceeds 50%, as there is no discernible change in resistivity in intact rock or rock masses with few joints. The empirical equations proposed in this study, utilizing discontinuity and rock mass strength, are found to be valid across the entire spectrum of RQD values (0–100%). These equations demonstrate a correlation coefficient of 0.9, indicating statistical validity and applicability in tunneling along the Himalayas. In addition to this the deformation modulus of rock mass has also been correlated with RQD with a great accuracy and correlation coefficient of 0.99. Statistical analyses confirm the fitness of the proposed equations, filling critical gaps in accurate RQD determination. The results not only optimize tunneling practices in the Himalayas but also offer their applications in diverse geological contexts.</p>