The subject of this study is sales forecasting of pharmaceutical representative company. The aim of the project described in this document is to create the custom tailored sales forecasting software for pharmaceutical representative company. The document consists of three main parts. In the analytical part the document the literature analysis and overview of existing solutions is performed. Most widely used forecasting techniques, methods and their appliance possibilities are described and classified. Advantages and disadvantages of existing forecasting tools are exposed. In accordance with the performed analysis the type of the system and forecasting methods that should be implemented in the system were selected. Key features of the created software design are described in the design part of the document. The created software has been examined with the real data of a pharmaceutical representative company. Generated sales forecasts were compared with real sales indexes. Results of the performed research were summarized and conclusions for usage of the created system were drawn.