The main objective of this thesis was to anylze the fixed and variable costs in the selected company. In the introduction, the teoretical part, we dealt with the theoretical definitions of basic concepts of the issue. The necessary informations were obtained from domestic and foreign literature that deal with this issue. In the practical part, the theoretical knowledge were used to analyze the costs of the selected company. We chose the production company that operates in bakery industry. The costs were analyzed by using least squares method, regression and correlation analysis and arithemtic method. For the calculation we used the data from internal documentation that the company provided to us.In the conclusion, we summarized the results of the selected mathematical method, and we put forward practical solutions to address the shortcomings.