In this paper, calculations of the grounding system were performed in two ways: using design methods and using the EarthHGriD software package. Based on the results obtained, a final conclusion was made on the accuracy of the calculation of the grounding system using design methods. The introductory chapter of the thesis describes its task. In the second chapter, we list the international standards for the design of grounding systems that were adopted in 1968 and have been valid in Croatia since September 30, 2008, when the application of the new standard HRN IEC 62305-3 ”Lightning protection Part 3: Physical damage to buildings and danger to life” began. The third chapter describes the basic characteristics of grounding, the effect of electric current on the human body, touch voltage and step voltage. Furthermore, this chapter describes the method of designating the grounding system, where in low-voltage distribution networks there are three types of networks with respect to the grounding system: TN, TT and IT system. The fourth chapter describes the tasks of grounding as well as the propagation resistance on the basis of which the grounding system is evaluated. Furthermore, the impact propagation resistance related to atmospheric discharge through the grounding electrode is mentioned, as well as the potential of the earth in the vicinity of the grounding electrode. The fifth chapter lists and describes the materials and shapes used for the grounding electrode, as well as the method of their installation. The sixth chapter presents the calculation of the grounding system using design methods for three types of grounding electrodes. The first type of grounding electrode is made using a horizontally placed strip grounding electrode, the second using a vertically placed rod grounding electrode in the form of grounding probes, while the third type is made using a combination of the previous two. The seventh chapter describes the operation of the EartHGriD software package. The eighth chapter presents the results obtained with the EarthHGriD software package and calculates the difference in the values of the propagation resistance obtained by design methods, on the basis of which a conclusion will be drawn on the accuracy of the calculation of the grounding system using design methods.