The heat capacity of the congruently melting compounds K2CeBr5 and K3CeBr6 was measured by differential scanning calorimetry in the temperature range from 400 K up to 1100 K. A linear heat capacity dependence on temperature was used to fit the experimental data. Through combination of these results with the entropy at 298.15 K, and enthalpies of phase transitions, the thermodynamic functions of K2CeBr5 and K3CeBr6 were calculated up to T = 1100 K.