Abstract Based on the available experimental data of phase equilibria and thermodynamic properties from the literature, the Ni-Pr binary system has been thermodynamically assessed using the CALPHAD method. The solution phases, Liquid, FCC_A1, DHCP and BCC_A2 were modeled as substitutional solution phases, for which the excess Gibbs energies were formulated with Redlich–Kister polynomials. All intermetallic phases were described as stoichiometric compounds. Subsequently, a set of self-consistent thermodynamic parameters describing various phases in this binary system has been obtained. The calculated results reproduce well the corresponding experimental data.