The speed of the human flow depends on its density. The free space in this flow depends not only on the number of people, but also on the area occupied by each of the people. The important parameter required for calculation of evacuation probability is the projected area of a human. The authors took ellipse as a shape of horizontal projected area of a human. The necessity of the dimensions for fire practice was first formulated in 1951. However, this was static dimensions. For evacuation software modeling the dynamic dimensions might be more appropriate. The paper discusses the experiments aimed to obtain static and dynamic dimensions of the pedestrians of various mobility groups. The obtained data should be used to increase the accuracy of evacuation process modeling and to rationing the escape routes and the sizes of exits.