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This paper presents the analytical and numerical calculations of the current distribution and impedance per unit length in real, multi-layer and two-layer homogeneous grounds. Realistic situations consisting of different thicknesses of ground layers were considered in these calculations. Combinations of parameters were considered at frequencies between 50 Hz and 2500 Hz (the 50^th harmonic, of the basic frequency). Calculations were conducted by applying a software tool developed previously for a homogeneous ground, based on a combination of analytical and numerical mathematical procedures and modified, using boundary conditions. The problem was also solved numerically by applying the COMSOL Multiphysics software package, based on FEM. The results are validated by comparing them with the results obtained from empirical formulae applied in practical cases. © 2021, Budapest Tech Polytechnical Institution. All rights reserved.