About
P/E (Price to Earnings) = price / EPS. Average S&P 500: 18-22 (current ~25). Below 15: 'value'. Above 30: 'growth'. Forward P/E uses estimated next-year earnings - typically lower than trailing. Different industries have different normal ranges (tech 30+, utilities 15-).
Three flavors of P/E matter and confusing them produces the bulk of "but Yahoo shows a different number" disagreements. Trailing P/E (TTM) divides today's price by the last four reported quarterly EPS, using GAAP net income. Forward P/E uses next-12-month consensus EPS estimates and almost always reads lower because analysts forecast growth. Shiller CAPE divides price by the inflation-adjusted 10-year average of real earnings; it sat at around 35 in early 2026, well above its long-run mean of 17 and surpassed only twice in history, in 1929 and 1999-2000. Negative or near-zero trailing earnings give a meaningless or "NM" P/E, which is why high-growth and cyclical names are often valued on EV/Sales, EV/EBITDA or forward earnings instead. Compare a stock's P/E to its own 10-year history and to its sector median, not to the S&P aggregate alone.
Formula
Frequently asked questions
How accurate is the Price-to-Earnings Ratio?
It applies the standard formula. Accuracy is limited only by your input precision. For decisions with material consequences (taxes, medical, legal, structural), use the result as a starting point and verify with a qualified professional in the relevant field.
Is the Price-to-Earnings Ratio free to use?
Yes. 100% free, no signup, no payment, no API key. The site is funded by display ads around the tool but not inside the calculation flow.
Are my inputs saved anywhere?
No. All inputs stay in your browser tab. Closing the tab discards them. The site uses Google Analytics for traffic measurement (anonymized) but the analytics never see what you type into the form.
Can I use the Price-to-Earnings Ratio on my phone?
Yes. The tool is responsive and tested on iOS Safari, Android Chrome, and major desktop browsers. Touch targets meet Apple's 44pt and Google's 48dp minimum.
Does the Price-to-Earnings Ratio work offline?
Yes. Once the page has loaded, it works without internet. The calculation runs in JavaScript on your device.
How do I report a bug or suggest improvement to the Price-to-Earnings Ratio?
Email hi@3tej.com with the URL of this page and a description of what you saw vs expected. We typically respond within 72 hours.
Can I share results from the Price-to-Earnings Ratio?
Take a screenshot or copy the output. The page doesn't generate shareable URLs for specific calculations - inputs stay in your browser only.
Why are the results different from another price-to-earnings ratio tool?
Most likely: different formula assumptions, different default values, different rounding rules, or different applicable rates. Check the methodology if both tools document it. Both can be valid for different scenarios.
Is the Price-to-Earnings Ratio accurate?
The Price-to-Earnings Ratio applies the standard formula for price-to-earnings ratio. Accuracy is limited only by your input precision. For decisions with material consequences, use the result as a starting point and verify with a qualified professional or the relevant official source.
Is the Price-to-Earnings Ratio free?
Yes. 100% free, no signup, no payment, no API key. The site is funded by display ads that appear around the tool but not inside the calculation flow.
Are my inputs saved?
No. Inputs stay in your browser tab. Closing the tab discards them. The site uses Google Analytics for traffic measurement (anonymized) but does not see what you type into the form.
When is P/E useless and what should I use instead?
P/E breaks when earnings are negative, near zero, or distorted by one-time items. Early-stage cloud, biotech and recently public tech names rarely have stable GAAP earnings, so analysts default to EV/Sales (under 10x is "reasonable" for SaaS), EV/EBITDA (a 1990s LBO benchmark of 8-12x still anchors industrials), or Price-to-Free-Cash-Flow. For banks, Price-to-Tangible-Book is the standard. For REITs, use Price-to-FFO, not P/E, because GAAP depreciation distorts real estate earnings.
How is PEG different from P/E?
PEG = P/E divided by the expected EPS growth rate (in percent). Peter Lynch popularized PEG = 1.0 as the "fair value" threshold: a P/E of 30 is fine if EPS is growing 30% a year. Below 1.0 is a value signal; above 2.0 means you are paying for growth that may not arrive. PEG only adjusts for growth rate; it does not adjust for growth quality, balance-sheet risk, or sector cyclicality, so treat it as a fast screener, not a verdict.
How to use the Price-to-Earnings Ratio
The Price-to-Earnings Ratio is a browser-based tool that runs entirely on your device. Inputs you enter never reach a server - all calculations happen client-side in JavaScript. This means:
- Privacy: nothing is logged, sent, or stored by 3Tej. Inputs disappear when you close the tab.
- Speed: results update as you type. No network round trip.
- Offline use: once the page is cached, it works without internet.
- No signup: no account, no email, no rate limits.
Step by step
- Enter your inputs in the form above. Each field is labeled with its unit (currency, percent, kg, etc.) and the expected range.
- Read the result as it updates. The number reflects the formula commonly accepted in Price-to-Earnings Ratio-related calculations.
- Adjust to see sensitivity: change one input at a time and watch how the output moves. This is the fastest way to understand which variable matters most.
- Copy or screenshot the result for later reference. The page state persists for the session if your browser allows it.
When you would use this
- Quick estimates: when you need a number now and don't want to open a spreadsheet.
- Sensitivity analysis: testing how a result changes as inputs vary, before committing to a real-world decision.
- Comparison: running the same calculation with different inputs to compare options side by side.
- Learning: building intuition for how the underlying math behaves.
- Documentation: capturing a snapshot of inputs and outputs at a point in time.