This thesis deals with the topic of inventory management through production planning. The topic of the work is dealt with in chapters that generally discuss the concept of inventory, types of inventory, management models, production process, information systems, and an analysis of inventory management at the manufacturing company Franck is presented. Inventories represent the amount of various items that we find in warehouses and in means of transport. Too much inventory can stop production, even lead to inventory failures, and too little can disrupt operations by preventing sales or production flows. Traditional and modern methods and a sequence of information systems are used for the coordination or management of stocks, which are created according to the user's request. Considering the division of income or expenses into business, financial and extraordinary income or expenses, it is very important to distinguish which of them are the most important. If companies do not pay attention to inventory management, the company's costs could be higher than expected. The conclusion of this paper is that inventory and production management is very important for the overall business plan of the company, and in order to achieve positive business results, expenses must be lower than income.