The topic of this thesis was the simulation of permanent mould casting of weights made of aluminum alloy. The thesis was divided into two parts, the first being theoretical and the second experimental. In the theoretical part of the thesis, the significance of the casting industry in manufacturing industry was briefly explained, as well as the importance of aluminum in both industries. Furthermore, the casting processes of aluminum and aluminum alloys into permanent molds were described. The focus was on permanent mould casting, while other processes were briefly explained. An overview of the most commonly used alloys for permanent mould casting was given, with special attention to the aluminum alloys used in this study. The theoretical part ended with a description of the importance of casting simulation. Its capabilities, advantages, and operation were discussed. Additionally, the casting simulation software ProCAST was briefly introduced. In the experimental part of the thesis, the permanent mould casting of two aluminum alloys was simulated. The influence of mould preheating temperature and casting temperature on the solidification time and the occurrence of porosity in the casting was analysed. The simulation results were analysed using the Analysis of Variance (ANOVA) method, and response surfaces for solidification time and porosity probability were obtained. Finally, the simulation results were compared with the actual casting, produced in the Foundry laboratory at the Faculty of Mechanical Engineering and Naval Architecture. The simulation results match the results of the actual casting, which means that the simulation accurately predicted the position of the porosity in the actual casting.