Software effort estimation is very crucial in software project planning. Accurate software estimation is very critical for a project success. There are many software prediction models and all of them utilize software size as a key factor to estimate effort. Function points size metric is a popular method for estimating and measuring the size of application software based on the functionality of the software from the user's point of view. While there is a great advancement in software development, the weight values assigned to count standard FP (Function Point) remains the same.