In the present study, the thermal conductivity relation equation given by Leibfried and Schlomann is extended and thermal conductivity is estimated at different pressures and temperatures by predicting the variationof Debye temperature, Gruneisen parameter and volume compression with temperature and pressure. The change in volume under variable pressure and temperature for the materials considered, viz. NaCl, NaI, KCl and KBr, arepredicted from Goyal–Gupta pressure–volume–temperature equation. The results obtained for variation of volume with temperature and pressure using Goyal–Gupta equation are compared with the available experimental dataand theoretical values obtained using Stacey’s equation. The thermal conductivity values are estimated at different temperatures with pressure along different isotherms and results are compared with thermal conductivity data available in previous studies for pressure dependence as well as for temperature dependence to justify the present model.