π P/E Ratio Calculator
What you pay for each dollar of earnings.
Share price divided by earnings per share
Estimates for planning only, not financial advice.
The price-to-earnings ratio divides a stock's price by its earnings per share, telling you how many dollars you pay for each dollar of annual profit. A P/E of 25 means $25 per $1 of earnings, or 25 years of current earnings to earn back the price. It is the most quoted valuation multiple in markets, and the most misused.
How to Use This Calculator
Enter the current share price and earnings per share. Use trailing twelve-month EPS for what the company actually earned, or forward EPS for what analysts expect. The calculator returns the P/E, the earnings yield (its inverse, handy for comparing against bond yields), and the payback in years.
Enter the share price and EPS. Be clear whether EPS is trailing (fact) or forward (forecast).
Read the P/E and earnings yield. Compare the yield to bond yields for a rough cheap-or-dear read.
Adjust for growth before judging. Our PEG ratio calculator folds growth into the picture.
The P/E Formula
The ratio packs three judgments into one number: expected growth, risk, and earnings quality. High P/E means the market expects growth or sees safety; low P/E means it expects stagnation or sees risk. Same ratio, opposite stories, which is why P/E alone never settles an argument.
Worked Example
A stock trades at $150 with trailing earnings per share of $6. The P/E is 25. The earnings yield is 4 percent, meaning the business earns 4 cents per year for each dollar of share price, before growth. At a 4 percent Treasury yield, the stock offers no yield advantage for taking equity risk, so the price only makes sense if earnings grow.
Reading Your Result
The long-run market average sits near 15 to 20 times trailing earnings; below 12 often screens as cheap, above 30 as demanding. But averages mislead across sectors: utilities live at 15, high-growth software at 40 plus. Judge against the company's own history and its sector peers, never against a universal number.
My rule: a low P/E is a question, not an answer. Ask why the market refuses to pay up: declining business, one-time earnings spike, accounting games, or genuine mispricing. Most low P/Es are the market being right. The ones worth buying are where you can name the specific fear and explain why it is overdone. For earnings measured in cash rather than accounting, our price to cash flow calculator is the stricter screen.
The P/E ratio has a famous blind spot: it means nothing when earnings are negative, and it misleads when earnings are temporarily depressed or inflated. Cyclical companies look cheapest at the top of the cycle (peak earnings, low P/E) and most expensive at the bottom, which is exactly backwards. Shiller's CAPE answers this by averaging ten years of inflation-adjusted earnings.
Growth expectations explain most P/E differences. A P/E of 30 on 20 percent growth can be cheaper than a P/E of 12 on zero growth; the PEG ratio formalizes that comparison. But forecasts are optimistic by profession, so haircut them. The investors who survived every bubble share one habit: they asked what the P/E would look like if growth disappointed, and sized positions accordingly.
Estimates for planning only, not financial advice.
Frequently Asked Questions
What is the P/E ratio?
The price-to-earnings ratio is a stock's share price divided by its earnings per share. It shows how much investors pay for each dollar of annual earnings. A P/E of 25 means paying $25 for $1 of yearly profit. The inverse, E/P, is the earnings yield: a P/E of 25 equals a 4 percent earnings yield.
How do you calculate the P/E ratio?
Divide the current share price by earnings per share. With a $150 price and $6 EPS, the P/E is 25. Use trailing twelve-month EPS for historical fact or forward EPS for analyst expectations, and say which you used. Trailing P/E uses audited history; forward P/E uses estimates that get revised, usually downward.
What is a good P/E ratio?
There is no universal good number. The broad market has averaged 15 to 20 times trailing earnings over long periods. Below 12 often looks cheap and above 30 looks expensive, but sector norms differ widely, so compare within the industry and against the stock's own history.
What is trailing vs forward P/E?
Trailing P/E uses the last twelve months of actual earnings: fact, but backward-looking. Forward P/E uses expected next-twelve-month earnings: relevant, but hostage to forecasts. Value investors lean trailing; growth investors lean forward. Know which one any quoted P/E uses. Shiller's CAPE smooths earnings over ten inflation-adjusted years to tame the cycle problem.
What does earnings yield tell you?
Earnings yield is 1 divided by P/E, expressed as a percent. A P/E of 25 is a 4 percent yield. It lets you compare stocks to bonds directly: if the earnings yield sits well above bond yields, equities look relatively cheap, and vice versa.
Can P/E be negative?
The ratio itself goes meaningless when earnings are negative; data providers usually show it as not meaningful rather than negative. Never compare a negative-earnings P/E to positive ones. Use price-to-sales or enterprise multiples for unprofitable companies instead. Screens that filter 'P/E > 0' exist precisely because negative values poison the ranking.
Why do some stocks have very high P/E ratios?
Because the market expects fast earnings growth, sees very low risk, or both. A P/E of 50 implies earnings roughly tripling to justify it at normal multiples. Sometimes the market is right; often it is extrapolating a good run too far.
Is a low P/E always a bargain?
No. Low P/Es frequently mark value traps: declining businesses, cyclical peaks in earnings, or accounting-inflated profits the market distrusts. A low P/E is the start of research, and the research question is always why the market will not pay more.
How does P/E relate to the PEG ratio?
PEG divides P/E by the earnings growth rate, adjusting the price tag for growth. A P/E of 25 with 25 percent growth (PEG 1.0) can be fairer than a P/E of 12 with zero growth. PEG is the natural next step after P/E.
Do stock splits change the P/E?
No. A 2-for-1 split halves the price and halves the EPS, leaving the ratio unchanged. Splits change the per-share numbers cosmetically; valuation multiples see through them completely. Reverse splits work the same way in reverse: price and EPS both rise, ratio untouched.