Productivity has been very attractive for researchers and workmen since long time ago. Recently, a lot of papers and books have been written about its importance. There are different methods for evaluating and measuring productivity that can be used in different international, national, industry and organization level. This paper tried to compute the productivity index (workforce productivity, invest, material, energy and total factor productivity (TFP)) in Gas company of Hormozgan during organization activity. For computing total factor productivity index Cobb-Douglas production function is used. In addition to mathematical definition, productivity computations and data extraction method, the mathematical model of productivity fraction in economic growth of company and productivity promotion of total factors will be presented. The results showed: workforce productivity index follows an increasing process the main reason of which is experienced and skilled staff during time. Invest productivity index showed that per each invest unit almost one added value is created and material productivity index expresses that each computed material cost (direct material) is about 1.5 unit of added value. But energy production index has a lot of fluctuation and it descending process because of company development and organization activity development and energy consumption according to the number of areas. Total factor productivity index is increasing gradually and it is predicted to be continued in future. In general, attention to promoting income level of company through increasing productivity is a key solution for organization development.
