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This post reports the analytical calculation of the filling coefficient η and the depth coefficient ξ, which allow the evaluation of modulus and position of the resultant of compressive stresses acting on the concrete of a (rectangular) cross section subjected to simple bending, when a parabola-rectangular stress-strain is adopted. These coefficients multiply either the product of rectangular compressed area and design strength, or the neutral axis depth, respectively. The trend of these parameters is listed and graphically shown in the case of values of strain at the beginning of plateau and ultimate strain respectively equal to 2·10⁻³ e 3.5·10⁻³, which are typically adopted for concrete up to strength class C50/60.