This research allows for a selection of gearbox according to minimal dimensional criteria from automated analytical calculations. An automation of the calculation process for four different analytical approaches from literature. The results achieved in the software are compared according to various criteria, minimal length, height, width, and volume. The automation of the process allows for a selection of gearbox concept depending on the chosen criteria. For specific input values, a verification of the automated software operation was conducted, and the resulting values are compared and discussed. Differences in calculated volumes of gearboxes, depending on choice of calculation, reach over 50%. This approach allows for adequate choice of gearbox for specific cases and speeds up the calculation process.