The paper deals with the design of a program for calculation of belt gears. The aim of the presented paper is to create the program for check and calculation of belt gears and consequent comparison of the results of the newly created program with the existing ones. The introductory part of the paper analyses the issue of belt gears, their categorization as well as the design and calculation of the belt gears. The core of the paper focuses on the most frequently used software applied in the design and calculation of belt gears. The summary describes the design regarding the calculation of the belt gears and final comparison of calculations.