P/E Ratio Calculator
Calculate the price-to-earnings ratio to evaluate whether a stock is overvalued or undervalued.
Frequently Asked Questions
What is the P/E ratio?
The price-to-earnings (P/E) ratio measures how much investors pay for each dollar of a company's earnings. It is calculated by dividing the stock price by earnings per share. A P/E of 25 means investors pay $25 for every $1 of annual earnings.
What is a good P/E ratio?
There is no universal "good" P/E. The S&P 500 average historically ranges from 15-25. Growth companies often have higher P/Es (30-60+) because investors expect faster future earnings. Value stocks trade at lower P/Es (5-15). Compare within the same industry for meaningful context.
What does a high vs. low P/E mean?
A high P/E suggests investors expect strong future growth and are willing to pay more today. A low P/E may mean the stock is undervalued or that the market expects declining earnings. Neither is automatically good or bad without understanding why the ratio is where it is.
What is the difference between forward and trailing P/E?
Trailing P/E uses the last 12 months of actual reported earnings. Forward P/E uses analyst estimates of future earnings. Forward P/E is more useful for fast-growing companies whose past earnings understate their current value. Trailing P/E is based on confirmed numbers.
What are the limitations of P/E?
P/E does not work for companies with negative earnings (the ratio becomes meaningless). It ignores debt levels, cash reserves, and growth rates. Accounting differences between companies can distort earnings. Always use P/E alongside other metrics like PEG ratio, price-to-sales, and free cash flow yield.