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Queuing models and simulation are two primary methods applied to container terminal planning. Queuing models tend to result in underestimated outcomes due to ships and berths not being classified by size and length. This paper classified both ships and berths using actual data and then compared the resultant differences of the scenarios with and without classification with the simulation. The comparison shows that the outcomes with and without the classification of ships and berths are located opposite to the outcomes obtained from the simulation, which was deliberately constructed and rendered sufficiently accurate results. The optimal scale of facilities of a container terminal is located between the outcomes of the two proposed scenarios. There is no longer a need to establish a complex and tedious simulation model. The method proposed in this paper provides a convenient way to determine the optimum number of berths and facilities for a container terminal.