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P/E Ratio Calculator

Work out a stock's Price-to-Earnings ratio and its earnings yield in one step.

The Price-to-Earnings (P/E) ratio is the most quoted valuation shortcut in investing: it tells you how many dollars of share price you are paying for each dollar of a company's annual earnings. A P/E of 20 means investors are paying $20 for every $1 of profit the company generates. On its own that number means very little — it only becomes useful once you compare it against something: the same company's own history, a direct competitor, or the broader industry average. This tool lets you compute the ratio directly if you already know Earnings Per Share (EPS), or derive EPS first from raw Net Income and Shares Outstanding if that's the data you have on hand.

The Two Formulas This Tool Uses

P/E Ratio = Share Price ÷ Earnings Per Share. If you only have raw financial statements rather than a published EPS figure, derive it first with EPS = Net Income ÷ Shares Outstanding, then plug that into the P/E formula. The calculator does this automatically when you choose the "Calculate EPS" mode above.

Earnings Yield (%) = (EPS ÷ Share Price) × 100, which is simply the inverse of the P/E ratio expressed as a percentage. It is arguably the more useful of the two numbers for a specific reason: it puts a stock on the same footing as a bond. A P/E of 25 doesn't mean anything to most people intuitively, but an earnings yield of 4% is directly comparable to a 10-year Treasury yield or a savings account rate — you can immediately judge whether you're being compensated for the extra risk of owning the stock.

A Worked Example

Suppose a company reports Net Income of $12,000,000 for the year and has 2,000,000 shares outstanding. Its stock currently trades at $150 per share.

  • EPS = $12,000,000 ÷ 2,000,000 shares = $6.00 per share
  • P/E Ratio = $150 ÷ $6.00 = 25
  • Earnings Yield = ($6.00 ÷ $150) × 100 = 4.0%

Read together, this tells you the market is paying 25 times last year's earnings for this stock, which is equivalent to a 4% earnings yield. Whether that's expensive or cheap depends entirely on what else is available — the same industry's average P/E, this company's own 5-year average P/E, or the yield on a risk-free bond.

Why a P/E Number Alone Can Mislead You

A P/E ratio has no meaning in isolation. A software company with a P/E of 40 might be perfectly reasonably priced relative to its growth rate and industry peers, while a utility company with the same P/E of 40 would look wildly overvalued next to the sector average of 15-18. Earnings themselves can also be temporarily depressed or inflated by one-off items, accounting changes, or a bad quarter, which distorts the ratio without reflecting the business's true earning power. Always compare P/E against a peer group, an industry benchmark, or the company's own historical range — never treat a single P/E number as a verdict by itself.

Frequently Asked Questions

Q: What does a negative P/E ratio mean?
A: It means the company had negative earnings (a net loss) over the period used. A negative P/E isn't meaningful as a valuation multiple, so most data providers simply display it as "N/A" rather than a negative number, which is what this calculator flags too.

Q: Should I use trailing EPS or forward (estimated) EPS?
A: Either is valid as long as you're consistent when comparing companies. Trailing P/E uses the last 12 months of actual reported earnings; forward P/E uses analysts' projected earnings for the next 12 months. Forward P/E is more forward-looking but depends on estimates that can be wrong.

Q: Why is earnings yield more useful than P/E for comparing to bonds?
A: Bond yields are already expressed as a percentage return, so converting a stock's earnings into the same percentage format (via 1 ÷ P/E) lets you compare the two directly on a like-for-like basis, something the raw P/E multiple can't do.

Q: Can I use this for a company with no earnings at all (EPS of zero)?
A: No. Dividing by zero EPS produces an undefined P/E ratio. Early-stage or pre-profit companies are usually valued with other metrics, such as price-to-sales, instead of P/E.

Disclaimer: This calculator is for educational purposes only and does not constitute investment advice. P/E ratios and earnings yield are just two of many valuation tools and should never be used alone to decide whether to buy or sell a stock. Always do your own research or consult a qualified financial advisor before making investment decisions.