Enterprises are paying more and more attention to inventory management. Stocks are managed by selecting one of several possible methods for managing inventory. Finding the right methods for inventory management is important because it is necessary to find a method that maximally reduces the costs associated with storage of materials/products, but it should not happened that there is no stock of materials/products on stock. To solve this problem, calculations are made for the quantity of selected inventory types and cost-effective purchases. For a complete understanding of the problems and issues, inventory management studies are shown on the company example, which shows that up to the moment of stock optimization, inventories has three times the amount needed.