Price to Earnings Ratio
1250x
How it works
The Price-to-Earnings Ratio Calculator computes the P/E ratio of a stock and compares it to the sector average, S&P 500 average, and historical averages — helping you assess whether a stock is trading at a premium or discount to its earnings.
The P/E ratio is the most widely cited stock valuation metric. It answers "how much are investors paying per dollar of earnings?" A P/E of 20 means investors pay $20 for every $1 of annual earnings. High P/E can mean either an overvalued stock or a high-growth company where the market is pricing future earnings. Context — sector, growth rate, interest rate environment — is essential.
How to use it: enter the stock's current price and annual earnings per share (EPS). The calculator returns: - P/E ratio = Price / EPS - Forward P/E (enter next year's estimated EPS) - PEG ratio = P/E / EPS growth rate (normalizes P/E for growth, PEG < 1 often considered undervalued) - Earnings yield = EPS / Price (the inverse of P/E, useful for comparing stocks vs. bond yields) - Historical context: 10-year average S&P 500 P/E is approximately 16–18×
Sector comparison: the calculator includes the current P/E average for 11 GICS sectors — comparing a tech stock to the technology sector P/E is more meaningful than comparing to the broad market average.
P/E limitations: companies with negative earnings have no valid P/E ratio. Cyclical businesses (automotive, energy) have P/E ratios that swing wildly with the economic cycle. The metric is most useful for stable, profitable businesses.
Privacy: all calculations run in the browser.
Frequently Asked Questions
- The S&P 500's historical average P/E ratio is approximately 16–18× earnings. The long-run average (100+ years) is ~16×. The Shiller CAPE ratio (Cyclically Adjusted P/E using 10-year average earnings) averages ~17×. Markets have traded at significant premiums (above 25×) during bull markets and discounts (below 10×) during recessions. Context matters — P/E is relative to interest rates and growth expectations.
- Not necessarily. High P/E can mean: (1) the market expects high future earnings growth (tech companies, early-stage growth), (2) the company just had a temporarily depressed earnings year, (3) the stock is genuinely overvalued. Use the PEG ratio (P/E ÷ earnings growth rate) to normalize: a P/E of 30× with 30% earnings growth = PEG of 1.0, which is considered fairly valued.
- Trailing P/E uses the last 12 months of actual reported earnings. Forward P/E uses the next 12 months of analyst-estimated earnings. Forward P/E is more relevant for investment decisions but less reliable (analyst estimates can be wrong). When a company is expected to grow earnings significantly, forward P/E is lower than trailing P/E — showing the valuation looks more attractive on expected future earnings.
- Not reliably. Different industries trade at structurally different P/E multiples: utilities trade at 12–15×, banks at 8–12×, consumer staples at 18–22×, technology at 25–35×. Comparing a utility's 12× P/E to a tech company's 30× P/E doesn't mean the utility is cheaper — they operate in different growth and risk environments. Always compare P/E within the same sector.