In today's software industries there are many software cost estimation models are there to estimate the financial need to develop software. The result of the models typically requires obtaining approval to proceed, and factored into business plans, budgets, and other financial planning and tracking mechanisms. Many of the models are providing irrelevant output thereby putting the organization in confusion. So to choose a perfect cost estimation model becomes higher priority for the companies. In the authors' research to rank the cost estimation models proposed system uses previous performance data sets as the evidence.