What Is a Good P/E Ratio? Is High or Low Better?

P/E ratio, or price-to-earnings ratio, is a quick way to see if a stock is undervalued or overvalued. Generally speaking, the lower the P/E ratio is, the better it is for both the business and potential investors. Analyzing P/E ratio is useful metric to consider when comparing companies within the same sector, or against past P/E ratios of that company.

A financial advisor can help you use P/E ratios to choose the right stocks for your investment portfolio.

How P/E Ratio Is Used to Evaluate Investments

To determine P/E ratio, you divide the share price by the earnings per share. Here’s the formula:

Share Price ÷ Earnings Per Share = P/E Ratio

The resulting number tells you how much you are paying per dollar that the company earns. So, for example, a ratio of 15 would mean that investors are willing to pay $15 for every dollar of company earnings. This is why the P/E ratio is sometimes called the “earnings multiple,” or just “multiple.”

You can utilize the P/E ratio by comparing it to other P/E ratios of companies in the same industry, or to past P/E ratios of the same company. If you compare same-sector companies, the one with the lower P/E may be undervalued. Or, if you’re looking at past data for one company, a higher number could mean it’s no longer a bargain.

What Is a Good P/E Ratio?

Ultimately, there’s no hard-and-fast rule for what a good P/E ratio is. But in general, many value investors consider a lower P/E ratio to be better. Again, investors typically use these ratios in a comparative sense. In other words, what’s good or bad depends on what you’re comparing that figure against.

To give you some sense of what the average for the market is, though, many value investors would refer to 20 to 25 as the average P/E ratio range. The lower the P/E ratio a company has, the better an investment it is, according to this particular metric.

However, the above assumes a value mindset when looking at the market. If you prefer to invest in large-cap stocks, for instance, you may be willing to pay for a pricier investment with a higher P/E ratio.

Drawbacks of Using the P/E Ratio

The P/E ratio seems straightforward, but what figure you plug in for earnings can be tricky. For one thing, companies are responsible for reporting their own earnings, and accounting practices are not the same across the board. Some might use adjusted earnings, while others use earnings before interest, taxes, depreciation and amortization (EBITDA). There’s also the possibility that a company is inflating earnings by devaluing or hiding costs.

That’s partly why it’s a good idea to use other metrics alongside the P/E ratio when evaluating a company. Another reason: a company with a high ratio could have high growth prospects. Its ratio could be high because it is spending a lot of money to grow its business, meaning it could still be a good buy.

In other words, you shouldn’t just zero in on the P/E ratio when you’re deciding whether to buy shares. There are many other metrics to consider, including earnings charts, sales figures and other fundamentals of a company. You can also look at the dividend rate if you’re going for dividend investing. Exhaustive research should lead you to more prudent investments. If you don’t have the time to devote, consider hiring a financial advisor.

P/E Ratio Stock Examples

Drawbacks of the P/E ratio include that it ignores debt, growth and industry differences.

The lower a P/E ratio, the better a stock is perceived to be for an investor. This is due to the fact that a low P/E ratio is good for the business itself.

Here are some examples of stocks and their P/E ratios from March 2026:

Tesla, Inc. (TSLA): 340.70
Boeing Co. (BA) 100.93
NVIDIA Corporation (NVDA): 35.24
AT&T Inc. (T): 9.58
FTC Solar Inc. (FTCI): -0.80
Wayfair Inc. (W): -29.43

What Does a Negative P/E Ratio Mean?

A negative P/E ratio simply means that the company reported a net loss rather than a net profit for the previous accounting period. While that’s not ideal, a negative P/E ratio doesn’t necessarily indicate that a company is in trouble.

A temporary downturn caused by either internal or external forces can result in negative earnings. The imposition of widespread tariffs, for example, may trigger negative earnings if the company’s costs to import goods rise, which requires an adjustment period, or if market sentiment falters.

An extended period of negative P/E ratio reporting, however, could indicate that a company is spending more money than it is bringing in. That may foretell more significant consequences if the company later goes on to file for bankruptcy protection.

Forward P/E vs. Trailing P/E: Understanding the Context

Not all P/E ratios are the same. Investors may use trailing P/E or forward P/E. Which one they use affects their view of a stock’s value:

A trailing P/E uses actual earnings from the past 12 months, making it objective and based on reported data. It’s a backward-looking metric, which means it reflects how profitable the company has been, not necessarily how it’s expected to perform going forward.
A forward P/E, by contrast, is based on projected earnings for the next 12 months. These forecasts come from analysts and company guidance, making it a forward-looking measure that reflects future expectations.

If a stock has a high trailing P/E but a low forward P/E, that may suggest the company’s earnings are expected to grow. On the other hand, if the forward P/E is higher than the trailing P/E, that may signal anticipated earnings declines or overly optimistic stock pricing.

Both versions are useful, but they tell different stories. Trailing P/E is reliable for historical comparisons and peer benchmarking. Meanwhile, forward P/E helps assess whether a stock’s price is appropriate based on growth expectations.

Investors may use trailing and forward P/E ratios together to identify valuation gaps and make better-informed decisions about when to buy or sell investments.

How P/E Fits into a Broader Valuation Strategy

P/E ratio is a helpful starting point for comparing companies, but it works best when combined with other valuation metrics. Investors often pair P/E with measures like price-to-book (P/B), price-to-sales (P/S) and free cash flow to get a fuller picture of how a company is performing. These additional metrics can help identify whether a stock’s P/E reflects strong earnings, temporary results or accounting choices that affect reported profits.

Growth expectations also matter. Companies with fast-rising revenue or expanding markets may trade at higher P/E levels because investors anticipate stronger earnings ahead. In contrast, companies with slowing growth or shrinking markets may trade at lower P/E levels, even if their current earnings look solid. Looking at growth trends can help explain why similar companies trade at very different multiples.

Debt levels can also influence how useful the P/E ratio is. A company that relies heavily on borrowing may have earnings that look strong in the short term, yet its stock may still be priced cautiously if investors expect interest costs or refinancing risks to affect future profitability. Adding metrics like debt-to-equity or interest coverage can help clarify whether the P/E ratio reflects sustainable earnings.

P/E Ratio Mistakes That Lead to Bad Investment Decisions

A low P/E ratio can look like a bargain, but it does not always mean a stock is undervalued. Sometimes the multiple is low because the company is facing real problems. Revenue may be declining, the business may be losing customers to competitors or the industry itself may be shrinking. A stock trading at five times earnings in a sector where peers trade at 15 times earnings is not necessarily cheap. Its pricing may be due to the fact that the market expects earnings to fall.

The reverse is also true. A high P/E does not automatically mean a stock is overpriced. Companies with strong revenue growth, expanding profit margins or large addressable markets often trade at elevated multiples because investors expect earnings to catch up to the price. Dismissing these stocks based on P/E alone can mean passing on companies that go on to deliver strong returns over time.

Comparing P/E ratios across different industries is another common error. A software company and an electric utility operate with entirely different business models, growth rates, capital requirements and profit structures. A P/E of 30 may be reasonable for a fast-growing technology firm but would raise questions for a slow-growing industrial manufacturer. P/E comparisons are only meaningful when the companies you are comparing operate in similar markets with similar characteristics.

Relying on trailing P/E during unusual earnings periods can also distort your view. If a company had a one-time gain from selling a division or a temporary loss from a legal settlement, the trailing P/E will reflect that anomaly rather than the company’s normal earning power. Checking forward P/E alongside trailing P/E helps reveal whether the current multiple reflects ongoing performance or a temporary event.

Share buybacks can also make the P/E ratio misleading. When a company repurchases its own shares, the number of shares outstanding decreases, which mathematically increases earnings per share even if total profits have not changed. A declining P/E driven by buybacks rather than genuine earnings growth can create the appearance of improving value when the underlying business has not improved at all.

P/E Ratio vs. Other Valuation Metrics

The P/E ratio tells you how much investors are paying for each dollar of earnings, but it does not tell you whether those earnings are growing, sustainable or backed by actual cash. That is why experienced investors typically use it alongside other metrics rather than in isolation.

Some other valuation metrics you might consider evaluating include:

PEG ratio. The PEG ratio adjusts the P/E for expected earnings growth. You calculate it by dividing the P/E by the projected annual earnings growth rate. A company with a P/E of 30 and expected growth of 30% per year has a PEG of 1.0, which many investors consider fairly valued. A PEG below 1.0 may suggest the stock is undervalued relative to its growth. A PEG above 2.0, on the other hand, could indicate the market is pricing in more growth than the company is likely to deliver. PEG is particularly useful when comparing companies that are growing at different speeds within the same sector.

Price-to-book ratio. Price-to-book ratio compares the stock price to the company’s net asset value per share. This metric matters most for businesses where physical or financial assets drive value, such as banks, insurance companies and real estate firms. For asset-light businesses, like software companies, book value is less meaningful. This is because the company’s primary value comes from intellectual property, brand recognition and recurring revenue rather than tangible assets on a balance sheet.

Price-to-sales ratio. This measures what investors are paying per dollar of revenue rather than profit. It’s especially relevant for younger companies or those in high-growth phases that are reinvesting heavily and may not yet be generating consistent profits. A profitable company with a P/E of 20 and an unprofitable competitor with no P/E at all can still be compared using their respective price-to-sales ratios to evaluate which the market values more highly relative to its top line.

Free cash flow yield. Expressed as a percentage of the stock price, free cash flow yield measures the actual cash a company generates after paying for capital expenditures. While accounting decisions can influence reported earnings, cash flow is harder to manipulate. A company with a high P/E but a strong free cash flow yield may be more attractively valued than the earnings multiple alone suggests. This metric is useful for identifying businesses that generate more cash than their income statements imply.

How a Financial Advisor Can Help You Use P/E Ratios

A P/E ratio is a starting point, not a conclusion. Knowing how to calculate it is straightforward. Knowing what it means in the context of a specific company, sector and portfolio is where the analysis gets complicated. Here is where professional guidance changes the outcome.

Interpret P/E Ratios in Context

A P/E ratio without context is nearly meaningless. A ratio of 35 could signal an overpriced stock in one industry and a bargain in another. Getting the interpretation right requires knowing what normal looks like for the specific business you are evaluating.

What an Advisor Does: An advisor benchmarks a company’s P/E ratio against its sector peers, its own historical range and broader market averages to determine whether the current multiple reflects genuine value, investor enthusiasm or a structural problem with the business. That comparison prevents the common mistake of treating a low P/E as automatically cheap or a high P/E as automatically expensive.
Example: An investor notices that a regional bank is trading at a P/E of 8 and assumes it is a bargain because the market average is roughly 22. An advisor pulls the sector data and shows that regional banks typically trade between 9 and 13 times earnings. At 8, the stock is slightly below sector norms, but not dramatically so. The advisor also notes that the bank’s forward P/E has been declining for three consecutive quarters because analysts expect earnings to fall. What looked like a discount is actually the market pricing in a deteriorating business. The investor passes.

Compare Trailing and Forward P/E Together

Using only trailing P/E can give a distorted picture of a company’s value, especially after an unusual earnings period. Using only forward P/E relies entirely on analyst projections that may be optimistic. The two together tell a more complete story.

What an Advisor Does: An advisor reads trailing and forward P/E ratios side by side to identify valuation gaps, spot potential earnings surprises and flag situations where the current price reflects either too much optimism or an unwarranted discount. This dual view is especially useful when a company has recently reported a one-time gain or loss that skews the trailing figure.
Example: A technology company has a trailing P/E of 95 and a forward P/E of 28. The gap is large. An advisor investigates and finds that the trailing figure reflects a period when the company was investing heavily in a new product line, compressing reported earnings. The forward P/E reflects analyst consensus that the investment phase is ending and margins are expected to expand significantly. Rather than dismissing the stock as overvalued based on the trailing number alone, the advisor builds a position sized to the risk that the earnings recovery may take longer than projected.

Pair P/E With Other Valuation Metrics

A single metric never tells the full story of a company’s value. P/E ratios can be distorted by accounting choices, share buybacks and one-time events. Combining them with other measures produces a more reliable picture.

What an Advisor Does: An advisor builds a multi-metric valuation framework for each company under consideration, combining P/E with PEG ratio, price-to-sales, price-to-book and free cash flow yield to identify whether a stock is genuinely attractive or superficially cheap. Each metric addresses a blind spot the others leave open.
Example: A consumer goods company trades at a P/E of 18, which looks reasonable. An advisor runs the full analysis. The PEG ratio comes in at 2.4, suggesting the market is pricing in growth the company is unlikely to deliver. Free cash flow yield is 2.1%, well below the sector average of 5.8%, meaning the company is generating far less cash than its earnings suggest. Price-to-sales is at a five-year high. On P/E alone, the stock looks fine. Across four metrics, it looks expensive. The advisor recommends waiting for a better entry point.

Avoid Common P/E Mistakes

Low P/E ratios attract bargain hunters. High P/E ratios deter cautious investors. Both reactions can lead to poor decisions when the ratio is misread or applied without the right context.

What an Advisor Does: An advisor screens for the specific situations where P/E ratios are most likely to mislead, including companies with shrinking earnings, heavy share buyback programs, recent asset sales or significant accounting differences from sector peers. Identifying these distortions before committing capital prevents costly mistakes that look obvious only in hindsight.
Example: An investor screens for low P/E stocks and finds a retailer trading at 6 times earnings, well below the sector average of 14. It looks like a deep value opportunity. An advisor digs into the details and finds that the company has been aggressively buying back shares for three years, reducing the share count by 35%. Earnings per share have risen, but total net income has actually declined each year. The low P/E reflects shrinking profits spread across fewer shares, not a business getting more efficient. The advisor explains the distortion and the investor redirects the capital elsewhere.

Bottom Line

A good P/E ratio depends on the industry and market.

It’s a good idea for investors to understand the P/E ratio and how to use it to evaluate share prices. However, it’s only one of many available metrics. You shouldn’t rely on it alone, nor should you use it to compare companies in different industries. That said, it is a useful tool for determining whether a stock might be undervalued, which can help guide your portfolio decisions.

“The P/E ratio can give you an idea of a company’s value, but it doesn’t tell the whole story,” said Brandon Renfro, CFP®.

Brandon Renfro, CFP®, RICP, EA provided the quote used in this article. Please note that Brandon is not a participant in SmartAsset AMP, is not an employee of SmartAsset and has been compensated. The opinion voiced in the quote is for general information only and is not intended to provide specific advice or recommendations.

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