Purpose - development of method for determining the optimal stock of products, which would allow combining several models of optimal order quantity estimation, excluding errors of each composing model. The analytical model that allows averaging the estimation results obtained by means of statistical and Wilson models is designed. Optimization approach to the problem ensures uniqueness of obtained results and provides proper and unambiguous solution. It is statistically substantiated and experimentally confirmed that the statistical and Wilson models, designed to determine the optimal order quantity provide far different results. The capacity of combining the results of these calculations in a single complex is examined. For the first time the difference between the data obtained by means of Wilson and statistical models is defined. A formula of combining the results into a single package assuring unification of both approaches is developed. The optimal order supply for each product type on the criteria minimum of unsold goods storage costs or maximum of sale profit or minimum amount of unit storage can be defined having the following consumption parameters: overall demand statistics, net cost plus additional storage costs per unit of product, delivery and placing goods costs, stock capacity, the amount of stock remains, deficit matrix for each commodity type and sales profit per product type. Moreover, consideration of warehouse capacity allows determining the product that ensures maximum of sale profit. The method had been tested on real business data.

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