A PEG ratio cannot be used alone but is a very powerful tool when integrated with the basics (price, volume and chart reading). You must enjoy crunching numbers and have a calculator handy to estimate your own PEG ratio. Access to quality statistical information from the web such as past earnings and future earning estimates is essential to calculate this fundamental indicator. A variety of websites produce a PEG ratio but I have not found one site that has a reliable PEG ratio that I can use for my own research, so I calculate it myself, ensuring accuracy with the final number.

I am going to use the definition from investopedia.com as it makes complete sense and doesn