Abstract In the article is presented the methodology of analytical calculation of molar and specific heat capacity of austenitic 1Cr18Ni9 stainless steel. The 1Cr18Ni9 steel is non-stabilised chromium-nickel steel. The chemical content (in weight percentages) of the steel, heating and cooling curves of the Wolfson test probe type (made of 1Cr18Ni9) is the input for the calculation. Mathematical equations described in the article are the active part of the model and the thermal dependence of 1Cr18Ni9 molar heat capacity and the thermal dependence of 1Cr18Ni9 specific heat capacity are main results. The heat capacity model presented in the article takes 6 chemical components of austenitic 1Cr18Ni9 steel into account (C, Si, Mn, Cr, Ni, Fe) and heating and cooling curves of the probe are applied into the heat capacity model. Heating process of the probe in the LM 112.10 electrical resistance furnace up to 850 °C was repeated and recorded six times and the average value was taken into account. Cooling process in the Isomax 166 oil of 30 °C was repeated and recorded six times and the average value was taken into account as well. Alfa and beta modifications of two chemical components (Mn and Ni) are applied into the heat capacity model and no stress and strain states were applied. The rule of Neumann and Kopp was applied as a basic rule necessary for creating of the heat capacity model. Computing procedures were realised by program software Microsoft Excel. The heat capacity model as a function of temperature described in the article can be helpfully applied to calculate a specific heat capacity for chosen austenitic steel in a dependency of the steel chemical content and as a function of the heating and cooling curve.