The thermodynamic behaviour of bulk metallic glass forming melts have been studied by analyzing the temperature dependence of the Gibbs free energy difference Delta G, entropy difference Delta S and enthalpy difference Delta H between the undercooled melts and corresponding equilibrium solid phases. The study is made by calculating Delta G, Delta S and Delta H in the entire temperature range T-m to T-g for five samples Mg65Cu25Y10. Cu47Ti34Zr11Ni8, Zr46Cu46Al8,Zr-46(Cu4.5/5.5Ag1/1.5)(46)Al-8, Zr57Cu15.4Ni12.6Al10Nb5 and it is found that the calculated values of these thermodynamic parameters are very close to the experimental values, where T-m and T-g are melting temperature and glass transition temperature, respectively. (C) 2011 Elsevier B.V. All rights reserved.