This study proposes a simplified methodology to estimate the damage level and reduction factor which shows the residual seismic capacity of reinforced concrete block elements from the maximum response calculated by methods such as pushover analysis, dynamic analysis and others. The methodology is based on simplified models to estimate the maximum residual crack width from the residual deformation related to flexural, shear and rotational components. The models are eometrical relations calibrated by using test data. The calculated crack width is used later to estimate the residual seismic capacity of the structural element. For this purpose, the necessary concept to evaluate the relations between the maximum residual crack width and the residual seismic capacity of structural elements is introduced in this study. This concept is necessary at the reconstruction stage after an earthquake and can be applied to assess the necessity of repairs and seismic retrofit for the damaged elements.