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Optimized experimental data and estimated values are utilized for the assessment of thermochemical functions of alkali-earth cuprates. For the determination of temperature dependences of heat capacities the Neumann-Kopp additive rule was employed, Values of standard enthalpy of formation and molar entropy of Ca₂CuO₃, SrCuO₂ , Sr₂ CuO₃ and BaCuO₂ were optimized from experimental results. For the estimation of enthalpies of formation of CaCuO₂ and Ba₂CuO₃ a linear correlation between enthalpy of formation from oxides and ionic radius of alkali-earth cations was used. Molar entropy of CaCuO₂ and Ba₂ CuO₃ was estimated using the modified contribution method.