Abstract <p>The paper presents the results of a kinetic study of the thermal decomposition of calcium carbonate under conditions of continuous heating to a temperature of 1273 K at a constant rate of 1.25, 2.5, 5, 10, and 20 K/min. The integral method and the Coats–Redfern method were used to describe the reaction mechanism and determine the macrokinetic parameters. Experimental dependences of the logarithm of the preexponential factor on the activation energy were obtained. The dependences of the activation energy and preexponential factor on the heating rate are shown. The effect of the heating rate of calcium carbonate on the activation energy can be explained by the relationship between the heating rate and the concentration of CO₂. Equations are proposed for calculating the reaction rate constant using the integral data processing method and the Coats–Redfern method. It has been demonstrated that the integral method and the Coats–Redfern method allow one to calculate the macrokinetic parameters of the thermal decomposition of calcite with comparable accuracy and taking into account the heating rate in these calculations makes it possible to obtain calculated values of the degree of conversion, the standard deviation of which from the experimental data is &lt;4.1%.</p>