Within the context where the dimensional flexibility, the size of the performed activities and the use of resources – capacities of production, of labour force, of the capital etc. - shows the fitting degree of the company at the environmental changes, respectively the ability to obtain a performance, the issue of the size of the organization is the fundamental and essential answer that a modern manager has to look for and find it. The size of the company influences the production costs, the profit, the market quota and its social influence upon the stakeholders, context in which its calculation is important for the small companies (especially when the enterpriser wants to develop from the statute of “one man show”, at the implementing of a complex organizational structure), as well as for plants and industrial factories or even corporations and holdings with national and international activity.