The production of steel of desired composition is realized as a result of bringing some of the elements to the desired amounts after a series of chemical reactions occurring at different velocities between the elements or compounds at high temperatures and adding alloy materials for the other elements needed in the composition. The steel production process in an electric arc furnace can be defined in the following order: scrap charge, melting, oxidation, reduction, alloying, deoxidization, casting, and preparation of the furnace. In this study, a mass analysis is accomplished for an electric arc furnace at a steel company in Turkey. In order to make the mass balance, firstly all materials that are entering the system are calculated on a chemical component basis. The necessary information was provided from an iron and steel producing company. The results of the mass analysis are presented at the end of the study.