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, Sr2CuO3 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 Ba2CuO3 was estimated using the modified contribution method.