Abstract: A new method for evaluation of results of potentiometric titrations is proposed. This method is based on the three-parametric curve fitting and has been verified by experiments and by theoretical values and literature data. The results obtained indicate that it can be used for all reaction types of titrations. One advantage of the present method is that it allows simultanous calculation of E'₀,S and C_x with high precision. The method is particularly suitable for the full automatic potentiometric titration systems.