The P/E Ratio Explained (Part I)
Monday, January 26th, 2009
While the economy hovers in a holding pattern of uncertainty - I think it’s a good idea to get back to basics and really understand some of the fundamentals of stocks. So, let’s start with the metric most investors are familiar with: the P/E ratio.
The P/E Ratio Explained
In a nutshell, the P/E is simply the price of a stock per share divided by earnings per share (also called “EPS”). However, keep in mind that the way the P/E is calculated depends on what period of time you are looking at.
The “Current” P/E
The “current” P/E is the most basic variation of the P/E. It is simply the current market price divided by the most recent annual earnings per share (such as full year 2008 earnings for a company).
The “Trailing” P/E
If you look up a quote for Exxon Mobil on Yahoo Finance, the summary that is returned shows “P/E (ttm)“. This means the current market price is divided by “trailing twelve month” earnings per share. Essentially, you are taking the current stock price and looking backward at earnings for 4 quarters. Since earnings are reported quarterly, in April ‘09 you would divide the current price by earnings per share for Q2 ‘08 through Q2 ‘09 combined. Why? This gives you a more recent earnings benchmark to use for valuation.
The “Forward” P/E
Last but not least is the “forward” P/E - which tends to be the most controversial variation of the metric. Why? Well, because it is essentially using forecasted earnings for the next financial year in the denominator. Investors should consider the calculation of the forward P/E very carefully, as certain assumptions made by the analyst calculating the numbers can greatly affect this number. As a general rule, it is best to be conservative and underestimate earnings rather than overestimate them.
Tags: pe, pe ratio, price to earnings