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The goal of this paper is to show that the implementation of the queuing theory could set an optimal capacity of the port container terminal, or a combination of the number of berths and cranes per berth with the minimum costs for the given traffic. The container terminal is a system composed of a specific number of mutually depending subsystems so the optimal capacity of the terminal is reduced to the calculation of the optimal number of berths, since the capacity of the berth determines the necessary capacity of the other subsystems, and thereby a throughput of the entire container terminal. The optimal solution was received by applying a model of total costs that is based on the queuing theory. This model can be used for any container terminal and for terminals in present and future conditions. The results are a basis for bringing adequate business decisions related to the operating of the terminal. The model is tested on an example of container terminal Brajdica in Port of Rijeka. [ABSTRACT FROM AUTHOR]