P/E Ratio & Valuation Calculator
Compute a stock's P/E ratio and compare it against the industry average to flag overvaluation or undervaluation. Useful for quick fundamental screening before deeper analysis.
About this calculator
The Price-to-Earnings (P/E) ratio is one of the most widely used equity valuation metrics. The base formula is: P/E = Stock Price / Earnings Per Share (EPS). This calculator then goes a step further by computing a relative ratio: Relative P/E = (Stock Price / EPS) / Industry Average P/E. A relative P/E above 1.0 means the stock trades at a premium to its peers; below 1.0 indicates a discount. The expected growth rate field allows the tool to also compute an implied PEG ratio (P/E ÷ Growth Rate), giving a growth-adjusted perspective. Comparing a company's P/E to its industry average is essential because acceptable P/E levels differ significantly between sectors — technology stocks routinely trade at 30–40× while utilities may trade at 12–15×.
How to use
Assume a stock trades at $120, has an EPS of $6.00, an industry average P/E of 18×, and an expected growth rate of 12%. Step 1 — calculate P/E: $120 / $6.00 = 20×. Step 2 — calculate relative P/E: 20 / 18 = 1.11, meaning the stock trades at an 11% premium to the industry. Step 3 — calculate implied PEG: 20 / 12 = 1.67, suggesting the stock may be slightly expensive relative to its growth. These three signals together give a more complete picture than P/E alone.
Frequently asked questions
What is a good P/E ratio for a stock and how do I interpret it?
There is no universally 'good' P/E ratio — the appropriate benchmark depends on the industry, interest rate environment, and the company's growth stage. As a rough guide, the historical average P/E for the S&P 500 is around 15–17×. A P/E well above this may indicate high growth expectations or overvaluation, while a very low P/E may reflect undervaluation, slow growth, or elevated risk. Always compare the P/E to the company's own historical range and to its direct peers.
Why is it important to compare a stock's P/E ratio to the industry average?
Different industries have structurally different earnings profiles, capital requirements, and growth rates, which cause normal P/E levels to vary widely. Comparing a bank's P/E to a software company's P/E is misleading; you need sector context. The relative P/E ratio normalizes for this by showing whether a stock is cheap or expensive within its peer group. A stock with a P/E of 25× looks expensive in utilities but cheap in cloud software.
How does the expected earnings growth rate relate to the P/E ratio?
The growth rate provides essential context for interpreting P/E. A high P/E is only justified if earnings are expected to grow rapidly enough to justify the premium investors are paying today. The PEG ratio (P/E divided by growth rate) is the standard way to combine these two metrics. A PEG near 1.0 is generally considered fair value, meaning the growth rate is commensurate with the earnings multiple the market is applying.