n project-oriented companies which produce one-piece complex products, calculation of product price is a very challenging process asking for cooperation of an interdisciplinary team of experts, who will estimate the total cost of a product by applying various methods, based on their knowledge and experience. These methods are based on comparing a product or its parts with already made products whose cost is well-known. The model presented in this thesis takes an example of Brodosplit company. The model has been developed by using relational database which records the knowledge from the calculation process and enables easier comparison with new projects. In this way the accuracy of the calculation is increased whereas the cost is reduced.