The standard per-share valuation multiple for publicly traded stocks — how much investors are paying for each dollar of current earnings.
How it works
Share price divided by earnings per share (EPS) gives the P/E ratio.
What this does not include
P/E alone doesn’t account for growth expectations — this site’s separate PEG ratio calculator divides P/E by expected earnings growth for a more growth-adjusted comparison.
How to use this calculator
- Enter the share price and earnings per share (EPS).
A worked example
A $50 share price with $4 earnings per share: P/E ratio = 50 ÷ 4 = 12.5.
What the variables mean
| Variable | Meaning |
|---|---|
| Share price | Current market price per share |
| EPS | Earnings per share over the trailing period |
Edge cases worth knowing
A higher P/E doesn’t automatically mean overpriced — it often reflects the market pricing in expected future growth, so P/E is most meaningful compared against similar companies or the stock’s own history, not as a standalone threshold.
Zero or negative EPS makes the ratio meaningless or undefined — a company with no earnings (or a loss) has no valid P/E ratio, so the calculator declines to show one.
Frequently asked questions
What’s considered a “high” or “low” P/E?
It varies enormously by industry and growth expectations — comparing a P/E against industry peers or the company’s own historical average is generally more meaningful than a single universal threshold.
Why is P/E undefined for a loss-making company?
Because negative earnings make the ratio meaningless (or misleadingly negative) — other valuation metrics like price-to-sales are often used instead for companies without positive earnings.
What’s the difference between trailing and forward P/E?
Trailing P/E uses the last 12 months’ actual EPS; forward P/E uses analysts’ projected future EPS — this calculator computes the ratio for whichever EPS figure is entered.
