The thesis introduces a computer program for determining fire resistance of simple timber and reinforced concrete structural elements in accordance with Eurocode standards. The program is developed in the programming environment Matlab® R2013a, using graphical user interface development tool named GUIDE. Thermal actions used in the program include a selection of nominal fire curves as well as one of the natural fire models – the parametric curve. The method used to determine fire resistance of reinforced concrete elements is the 500°C isotherm method. The temperature layout across the crosssection is determined by temperature analysis, which is done in conjunction with the implemented program Heatko (Hozjan, 2009). For timber elements are used the fire resistance is calculated by the reduced cross-section method and by the reduced properties method (simultaneously). The results for each calculation consist of initial capacity, time of failure and a graph displaying bearing capacity loss over time. The program is presented by its theoretical background, instructions for use and five different practical examples.