Price to Earnings Ratio Calculator: P/E From Price and EPS
Work out a stock's price to earnings (P/E) ratio — the most widely cited single number in equity investing, and the quickest way to spot whether a share is priced for value or for growth.
Adjust the inputs and select Calculate for a full breakdown.
Compare Common Scenarios
How the numbers shift across typical situations for this calculator:
| Scenario | P/E ratio (price per $1 of earnings) |
|---|---|
| $50 price · $2.50 EPS | $20.00 |
| $120 price · $4.00 EPS | $30.00 |
| $30 price · $0.80 EPS | $37.50 |
| $200 price · $5.50 EPS | $36.36 |
How This Calculator Works
Enter the current share price and the company's earnings per share (EPS). The calculator divides one by the other to give the P/E ratio — read it as the dollars you are paying for each $1 of annual earnings.
The Formula
Cost per Unit
Total Amount is the full cost or price, Quantity is the number of units it covers
Worked Example
A stock trading at $50 with $2.50 of EPS has a P/E of 20 — investors are paying $20 today for every $1 of current annual earnings. The S&P 500 has averaged a P/E between 15 and 18 across long periods; growth stocks routinely trade above 30; mature value stocks below 12.
Key Insight
P/E is a price-relative-to-now metric. A high P/E means the market expects future earnings to be much higher; a low P/E suggests either declining expectations or undervaluation. P/E alone is never a buy or sell signal — pair it with growth rate (PEG ratio), debt levels, and industry comparable to interpret the figure correctly.
CAPE — Shiller's smoothed P/E for the long view
Robert Shiller's CAPE (Cyclically Adjusted P/E) uses average inflation-adjusted earnings over 10 years instead of trailing or forward 1-year earnings. The 10-year average smooths out business cycle distortions — a recession year's low earnings don't make a stock falsely cheap; a peak year's high earnings don't make it falsely expensive.
Long-run U.S. CAPE history: average ~17, range 5 (1920) to 44 (1999 dot-com peak). 2024 CAPE: ~34, second-highest in history after 1999. This signals expensive valuations historically — every prior period above CAPE 30 has been followed by 10-year forward returns of 0-5% real (well below long-run 7%).
Critique of CAPE: (1) accounting changes (goodwill impairments, R&D expensing, stock-based compensation) have made today's GAAP earnings less comparable to 1950s-1980s earnings; (2) low interest rates justify higher P/E ratios (lower discount rate raises present value); (3) sector composition has shifted to high-margin tech and consumer brands that warrant higher multiples than 1950s industrials. The 'true' fair-value CAPE may be 22-26 rather than 17 — making current 34 still expensive but not as extreme as raw comparison suggests.
Why tech P/E is structurally higher than utility P/E
P/E ratios vary across industries because growth rates, capital intensity, and risk profiles differ. Tech P/E (typical 25-40 for software / SaaS) is high because: (1) low capital requirements mean earnings can grow rapidly without proportional reinvestment; (2) network effects produce winner-take-most dynamics with high margins; (3) growth optionality is valuable. Utility P/E (typical 15-20) is low because: (1) heavy capital requirements limit growth; (2) regulated returns cap upside; (3) stable cash flows are easier to value but offer less upside.
Damodaran's annual sector data: median 2024 P/E by sector — Software 35; Pharma 22; Banks (regional) 13; Retail 18; Utilities 18; Real Estate (REITs) 20 (vs FFO, not earnings); Energy 14; Industrials 20. Cross-sector P/E comparison is economically meaningless without adjusting for growth, capital intensity, and risk.
Within sectors, P/E spreads can be 2-3×. Within software, growth-stage companies trade at 30-50× while mature lower-growth software (Oracle, IBM) trades at 15-20×. The right comparison is to the closest possible peer set — same sector, same growth rate, same capital structure. Pure P/E comparison across companies without controlling for these factors produces consistently wrong investment conclusions.
U.S. P/E benchmarks by sector and time period
Reference P/E ratios for U.S. equities. Historical CAPE smooths business cycle distortions.
| Metric | Current (~2024) | Long-run average | Notes |
|---|---|---|---|
| S&P 500 trailing P/E | ~25 | ~16 | Tech-weighted; current high |
| S&P 500 forward P/E | ~22 | ~15 | Based on estimates |
| S&P 500 CAPE (Shiller) | ~34 | ~17 | 10-yr smoothed; very high |
| Software / SaaS | 30-45 | ~25 | Growth premium |
| Pharma (large branded) | 18-25 | ~20 | |
| Banks (large diversified) | 10-13 | ~13 | Cyclical discount |
| REITs (vs FFO) | 18-25 | ~20 | Income-oriented |
| Utilities | 16-20 | ~17 | Income-oriented |
| Energy (oil majors) | 10-15 | ~14 | Cyclical |
Forward P/E uses analyst estimates which historically have been ~10% too optimistic on average. The 'real' forward P/E is typically ~10% higher than what's quoted. CAPE remains the most reliable long-run valuation indicator despite its accounting-comparability limitations.
Frequently Asked Questions
How is P/E ratio calculated?
Divide the current share price by earnings per share. A $50 stock with $2.50 EPS has a P/E of 20.
What is trailing vs forward P/E?
Trailing P/E uses the past twelve months of EPS — backward looking and verified. Forward P/E uses analyst estimates for the next twelve months — forward looking but less certain.
What is a good P/E ratio?
It depends on the sector and the company's growth. Mature businesses commonly trade at 10 to 18; growth companies often 25 to 50; some hyper-growth names well above that. Compare against industry peers, not market averages.
Why do some stocks have no P/E?
Because they have no earnings — either they are loss-making or earnings are negligible. Many high-growth tech companies trade at sky-high or undefined P/E for years; revenue multiples are often used instead.
How is P/E related to dividend yield?
Inversely correlated for mature payers. A higher P/E generally means a lower yield because dividends grow more slowly than the share price. Yield-focused investors often hunt at lower P/E ratios.
When is this calculator unreliable?
For companies with negative or near-zero earnings (P/E becomes undefined or extreme — use price-to-sales or price-to-book instead), when earnings are temporarily distorted by one-time items (use normalized 3-5 year average earnings or operating earnings), when comparing across sectors with different growth and capital characteristics (cross-sector P/E comparison is economically meaningless without adjustment), or as a stand-alone metric without growth context (PEG ratio = P/E divided by growth rate provides growth-adjusted comparison).
References & Authoritative Sources
- U.S. Securities and Exchange Commission (SEC) — Beginners' Guide to Financial Statements · consulted June 1, 2026 · Federal investor education on financial metrics
- Robert Shiller — CAPE Ratio Data — Shiller's Cyclically Adjusted Price-to-Earnings Ratio · consulted June 1, 2026 · Authoritative academic source for long-run U.S. P/E history
- Damodaran Online (NYU Stern) — Industry Multiples by Sector · consulted June 1, 2026 · Authoritative academic source for industry P/E benchmarks
Related Calculators
Data Sources & Benchmarks
This calculator draws on 1 independent, dated source.
Methodology & Review
Price-to-earnings ratio (P/E) equals stock price / earnings per share. The calculator returns the P/E ratio. Two main variants: trailing P/E uses past 12 months earnings (most reliable); forward P/E uses next 12 months earnings (more forward-looking but depends on analyst estimates). Historic S&P 500 average P/E: ~16; long-run range 7-30. Higher P/E indicates higher growth expectations or lower required return; lower P/E indicates concerns about future earnings or high required return. RELIABILITY: Reliable as a current-period valuation metric. Less reliable for companies with negative or near-zero earnings (P/E becomes undefined or extremely volatile), for comparing across very different industries (tech, banking, utilities, REITs have structurally different P/E ranges), when earnings are temporarily depressed by one-time items (use normalized earnings), or as a stand-alone valuation indicator without considering growth (high-growth companies justify higher P/E; PEG ratio adjusts for this).
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