P/E Ratio Calculator

Trailing P/E uses actual reported earnings from the past 12 months — it is factual but backward-looking. A stock at $100 with $5 EPS over the last year has a trailing P/E of 20.

Forward P/E uses consensus analyst earnings estimates for the next 12 months — more relevant for investment decisions but dependent on forecast accuracy. If analysts project $6.25 EPS next year, the forward P/E is 16, suggesting the stock is cheaper on a forward basis.

The gap between trailing and forward P/E reveals growth expectations: forward P/E significantly below trailing suggests expected earnings acceleration.

Always check both — a stock with a low trailing P/E but high forward P/E may be facing declining earnings, not representing value.

Sector average P/E ratios (2025-2026):

• Technology 28-35
• Healthcare 18-25
• Consumer Discretionary 22-28
• Industrials 18-22
• Financials 12-16
• Energy 10-15
• Utilities 14-18
• REITs 30-40 (distorted by depreciation — use P/FFO instead)

Growth drives P/E expansion: a company growing earnings at 25% annually justifies a higher P/E than one growing at 5% because each current dollar of earnings represents less of the company's future earnings power.

Risk compresses P/E: cyclical businesses with volatile earnings (airlines, automotive) trade at lower P/E ratios than stable businesses (consumer staples, utilities).

Interest rates also affect P/E — higher rates make future earnings less valuable in present-value terms, compressing P/E ratios market-wide.

P/E fails in several situations: companies with no earnings (many growth and biotech stocks) have undefined P/E ratios. Companies with temporarily depressed earnings show artificially high P/E, appearing expensive when actually cheap on normalized earnings.

The Shiller CAPE ratio (cyclically adjusted P/E using 10-year average earnings) smooths business cycle effects — the current CAPE of approximately 33 is historically elevated but has been above 25 since 2017.

Alternative metrics for specific situations:

• EV/EBITDA (8-12 typical) for comparing companies with different capital structures
• Price-to-Sales (P/S) for unprofitable growth companies
• Price-to-Book (P/B) for financial and asset-heavy companies
• Price-to-Free-Cash-Flow for capital-intensive businesses where earnings differ significantly from cash generation

The price-to-earnings (P/E) ratio is a stock's share price divided by its earnings per share (EPS). A stock trading at $50 with $2.50 EPS has a P/E of 20, meaning investors pay $20 for every $1 of annual earnings.

EPS comes from net income divided by shares outstanding, reported in company filings.

This calculator returns the P/E from price and EPS, and lets you choose trailing (past 12 months) or forward (projected) earnings.

There is no single 'good' P/E — it depends on growth, sector, and the market. Historically the S&P 500 has averaged a P/E in the mid-teens to low-twenties.

According to Investopedia, a low P/E can signal a bargain or a declining business, while a high P/E can mean rich valuation or high expected growth.

Judge a P/E against the company's own history, its sector peers, and its earnings-growth rate rather than an absolute threshold.

Trailing P/E uses the last 12 months of actual earnings; forward P/E uses analysts' projected earnings, so it reflects expectations but can be wrong.

The Shiller CAPE (cyclically adjusted P/E) uses 10 years of inflation-adjusted earnings to smooth out the business cycle and is widely watched for judging whole-market valuation.

Each answers a different question — use trailing for what happened, forward for expectations, and CAPE for long-run market context.

A high P/E is not expensive if earnings are growing fast. The PEG ratio divides P/E by the expected earnings-growth rate to normalize for growth: a PEG near 1.0 is often considered fairly valued, below 1.0 potentially undervalued.

A stock with a P/E of 30 growing 30% a year has a PEG of 1.0 — reasonable — while a P/E of 30 with 5% growth (PEG 6) is expensive.

PEG helps compare growth stocks that raw P/E makes look overpriced.

P/E reflects expectations about the future, not just current earnings. Fast-growing companies command high P/Es because investors pay today for much larger earnings tomorrow; a firm expected to triple earnings justifies a P/E far above a no-growth peer.

This is why technology stocks often trade at high multiples and utilities at low ones.

A high P/E is a bet on growth — reasonable if the growth materializes, costly if it disappoints.

Flipping the P/E gives the earnings yield — EPS divided by price, expressed as a percentage. A P/E of 20 equals a 5% earnings yield.

This lets investors compare a stock's earnings return directly against bond yields: when the earnings yield sits well above the 10-year Treasury, equities look relatively attractive, and vice versa.

Earnings yield is the same information as P/E in a form that is easy to compare with fixed-income alternatives.

P/E is one of several valuation multiples:

• Price-to-book (P/B) compares price to net assets and suits banks and asset-heavy firms
• Price-to-sales (P/S) works for unprofitable or early-stage companies with no earnings
• EV/EBITDA accounts for debt and is favored in acquisitions

P/E breaks down when earnings are negative or distorted by one-off items. Use a basket of multiples rather than P/E alone for a robust valuation.

The frequent errors are:

• comparing P/E across unlike industries
• using P/E on companies with negative or volatile earnings
• ignoring whether earnings are trailing or forward
• treating a low P/E as automatically cheap (it can be a value trap)

Investors also overlook one-time items that distort EPS and inflate or deflate P/E.

Normalize earnings, compare within sector, check the growth rate via PEG, and pair P/E with other multiples before concluding a stock is cheap or expensive.