Because the P/E ratio isn’t enough in and of itself, many investors use the price to earnings growth (PEG) ratio. Instead of merely looking at the price and earnings, the PEG ratio incorporates the historical growth rate of the company’s earnings. This ratio also tells you how company A’s stock stacks up against company B’s stock. The PEG ratio is calculated by taking the P/E ratio of a company and dividing it by the year-over-year growth rate of its earnings. The lower the value of your PEG ratio, the better the deal you’re getting for the stock’s future estimated earnings.
By comparing two stocks using the PEG, you can see how much you’re paying for growth in each case. A PEG of 1 means you’re breaking even if growth continues as it has in the past. A PEG of 2 means you’re paying twice as much for projected growth when compared to a stock with a PEG of 1. This is speculative because there is no guarantee that growth will continue as it has in the past.
The P/E ratio is a snapshot of where a company is and the PEG ratio is a graph plotting where it has been. Armed with this information, an investor has to decide whether it is likely to continue in that direction.
