P/E Ratio Calculator

There is no fixed number that applies everywhere — a "good" P/E depends heavily on the industry, the company's growth rate, and prevailing market conditions. It's most useful when compared against a company's own historical average or against similar companies in the same sector.

Industries with higher expected growth (like technology) tend to trade at higher P/E multiples because investors are paying up front for future earnings growth, while mature, slow-growth or capital-intensive industries (like utilities) typically trade at lower multiples.

Trailing P/E uses a company's actual earnings per share from the past 12 months, while forward P/E uses analysts' projected EPS for the next 12 months. Forward P/E can be more forward-looking but relies on estimates that may not materialize.

Yes, when a company reports negative earnings (a net loss), the P/E calculation produces a negative or undefined number. In that case the ratio isn't meaningful for valuation and other metrics like price-to-sales are often used instead.