P/E Ratio Calculator

The price-to-earnings (P/E) ratio measures how much investors pay for each dollar of a company's annual earnings. It is calculated by dividing the stock price by earnings per share (EPS). A P/E of 20 means investors pay $20 for every $1 of earnings. It is one of the most widely used valuation metrics in stock analysis because it provides a standardized way to compare stock prices across companies of different sizes.

There is no universal "good" P/E ratio. It depends heavily on the sector, growth rate, and market conditions. Technology companies often have P/E ratios of 25-40+ due to higher expected growth, while utilities or financials may trade at 12-18. The S&P 500 historical average is around 15-25. A lower P/E compared to sector peers may suggest the stock is priced conservatively, while a higher P/E may reflect growth expectations.

Trailing P/E uses the past 12 months of actual reported earnings (most common and objective). Forward P/E uses analyst estimates of future earnings for the next 12 months. Forward P/E is generally lower than trailing P/E for growing companies because earnings are expected to increase. This calculator uses whichever EPS value you enter — check whether your EPS figure is trailing or forward.

A negative P/E occurs when a company has negative earnings (losses). In this case, the P/E ratio is not meaningful for valuation purposes. Companies with negative earnings are often valued using alternative metrics like price-to-sales (P/S), price-to-book (P/B), or enterprise value to revenue (EV/Revenue). Many growth-stage technology and biotech companies operate at a loss for years before becoming profitable.

Earnings yield is the inverse of the P/E ratio, expressed as a percentage: (EPS / Price) × 100. It shows what percentage of the stock price is "earned" annually. A stock with a P/E of 20 has an earnings yield of 5%. Earnings yield is useful for comparing stocks to bonds or other fixed-income investments. A higher earnings yield means you get more earnings per dollar invested.

The PEG (Price/Earnings to Growth) ratio adjusts the P/E ratio for earnings growth. It is calculated as P/E divided by the annual earnings growth rate. A PEG of 1.0 is often considered "fair" — meaning the P/E ratio equals the growth rate. Below 1.0 may suggest the stock is underpriced relative to growth, while above 2.0 may indicate a premium. PEG helps compare companies growing at different rates.

P/E ratios reflect expected future growth and risk. Technology companies often have high P/E ratios (25-50) because investors expect rapid earnings growth. Utilities and financials have lower P/E ratios (12-18) because their earnings grow more slowly but are more predictable. Cyclical sectors like energy have volatile P/E ratios that depend on commodity prices. Comparing P/E within the same sector is more meaningful than across sectors.