Similarity theory and dimensional analysis were shown to be applicable for a kinetic analysis of an electrochemical reaction described by the Marcus-Hush-Chidsey (MHC) formalism. The corresponding dimensionless quantities (similarity criteria) were derived and approximating interrelations between them were analyzed. A convenient expression was obtained which connected the values of electrochemical rate constant, electrode polarization and reorganization energy in dimensionless complex coordinates. (C) 2012 Elsevier B.V. All rights reserved.