Picture this: You’re standing in front of a big board with hundreds of stock tickers.
You see a couple you recognize - maybe Nvidia and AMD.
Nvidia's stock price is $188 and AMD’s $223. You think to yourself, “wow, Nvidia is cheaper, it must be a better buy!”
And while, in this example, Nvidia’s stock price is lower, that doesn’t necessarily mean you’re getting more value for your money.
Professional investors use different valuation methods to actually value what a stock is worth, beyond price.
Because price is what you pay, but value is what you actually get.
So if you've ever wondered whether a stock is fairly priced, overvalued, or a potential bargain, the P/E ratio is where you start.
P/E is a valuation metric that compares a company's stock price to its earnings per share.
It tells you how much investors are willing to pay for each dollar of a company's earnings.
This single number helps you compare stocks, spot value opportunities, and make smarter investment decisions.
Let’s break down what P/E ratio means, how to calculate it with real examples, and how investors use P/E ratio to value stocks.
Before you go: Our market analysts are using P/E ratio and other valuation metrics to find some of the best hidden potential opportunities on Wall Street today.
These are individual stocks and ETFs you won’t hear talked about anywhere else - if you want insight into these potential investment opportunities, subscribe to Market Briefs Pro.
What P/E Ratio Means
P/E stands for price-to-earnings.
Here's what it tells you: if a company has a P/E ratio of 28, for example, investors are paying $28 for every $1 that company earns in profit.
The formula is straightforward:
P/E Ratio = Stock Price ÷ Earnings Per Share (EPS)
Earnings per share is calculated by dividing the company's net income by its total shares outstanding.
EPS = Net Income ÷ Total Shares Outstanding
Once you have both numbers, you can calculate the P/E ratio and understand what investors think the company is worth.
How to Calculate P/E Ratio (Real Example)
Let's walk through calculating the P/E ratio for Coca-Cola step by step.
Note: All numbers are pulled from Coca-Cola’s 2024 10-K.
Step 1: Find the stock price
Coca-Cola's stock price is around $70 per share. You can find this on any financial website like Yahoo Finance or by searching "Coca-Cola stock" on Google.
Step 2: Find net income
Look at Coca-Cola's income statement in their 10-K filing. The net income is $10.6 billion.
Step 3: Find shares outstanding
From the 10-K, Coca-Cola has about 4.36 billion shares outstanding.
Step 4: Calculate earnings per share
$10.6 billion ÷ 4.36 billion shares = $2.43 per share
Step 5: Calculate P/E ratio
$70 ÷ $2.43 = 28.8
Coca-Cola has a P/E ratio of 28.8. This means investors are willing to pay almost $29 for every $1 that Coca-Cola earns in profit.
What Does a Good P/E Ratio Look Like?
There's no universal "good" P/E ratio. It depends on the industry, the company's growth prospects, and market conditions.
Warren Buffett typically invests in companies with P/E ratios between 15 and 30.
At those levels, you're paying a reasonable price for earnings. But this isn't a hard rule.
He's bought companies with P/E ratios above and below this range when the opportunity justified it.
Here's how to interpret P/E ratios:
P/E under 15: Might indicate an undervalued company. Or it could signal serious problems the market is pricing in.
P/E between 15-30: Generally considered reasonable pricing. This is where many value investors look for opportunities.
P/E over 30: Could mean the stock is overvalued. Or investors expect strong future growth that justifies paying a premium.
Comparing P/E Ratios Between Companies
Let's compare Disney and Ford to see how P/E ratios work in context.
Note: These numbers are examples based on data from 2024 and 2025.
Disney:
- Stock price: $110
- EPS: $2.75
- P/E ratio: 40
Ford:
- Stock price: $13
- EPS: $1.17
- P/E ratio: 11
Disney's P/E of 40 is significantly higher than Ford's 11. Does that mean Ford is a better value investment?
Not necessarily. Disney's higher P/E suggests the market expects strong growth from streaming and entertainment.
Ford's lower P/E reflects that automakers are cyclical businesses affected by economic downturns, with thin profit margins and concerns about electric vehicle transitions.
The lower P/E might represent a value opportunity. Or it might reflect legitimate concerns about Ford's future profitability.
Either way, these numbers should not be viewed in a vacuum.
Professional investors use multiple valuation metrics to determine value, including valuing a company’s non-financials in addition to its financials.
P/E Ratios Vary By Industry
Tech companies typically have higher P/E ratios than agricultural companies, typically because tech companies have more prospects for growth and higher margins.
That's why you need to compare companies within the same industry.
Here's what semiconductor P/E ratios looked like at one point in 2025:
- Nvidia: 60.5
- AMD: 96.5
- Taiwan Semiconductor: 30.0
- Intel: Not profitable (can't calculate P/E)
These numbers are all over the place. That's because the semiconductor industry is rapidly changing, making P/E ratios less useful for comparison in this specific sector.
When P/E Ratio Works Best
The P/E ratio only works for companies with positive earnings. If a company is losing money, you can't calculate a meaningful P/E ratio.
For unprofitable companies, investors use different metrics like the P/S ratio (price-to-sales ratio), which compares stock price to revenue instead of profit.
P/E Ratio Limitations
The P/E ratio is a powerful tool, but it has limits.
It doesn't account for growth rates. A company with a P/E of 50 growing at 50% annually might be a better value than a company with a P/E of 15 growing at 5% annually.
That's why growth investors use the PEG ratio (price-to-earnings-growth ratio) instead.
It varies by industry. A P/E of 20 might be high for utilities but low for technology companies.
It uses past earnings. The P/E ratio looks backward at what a company already earned, not forward at what it might earn in the future.
How Investors Use P/E Ratios
Value investors like Warren Buffett use P/E ratios in addition to other metrics to find undervalued companies.
They look for stocks with low P/E ratios compared to their historical averages or industry peers.
Growth investors care less about current P/E ratios. They focus on whether a high P/E is justified by future growth prospects.
The key is understanding what the P/E ratio tells you and what it doesn't. It's one data point in your analysis, not the complete picture.
When you combine P/E ratios with other metrics like the P/B ratio (price-to-book), revenue growth, and competitive positioning, you get a clearer view of whether a stock is fairly valued.
And that’s important to note: Some investors like to use P/E ratio - other investors never use P/E ratio. That’s because this is just one of the simplest ways to begin valuing a company.
But it is not the only way. Our market analysts use dozens of key data points, along with financial and non-financial analysis in order to spot potential stock opportunities on Wall Street.
You can find out what specific opportunities our analysts have spotted this week by subscribing to Market Briefs Pro.
In the end, the P/E ratio is fundamental to stock analysis and one of the most commonly used.
It helps you understand what the market thinks a company is worth and whether you agree with that valuation.
But it’s just a starting point - professional investors don’t use it in a vacuum, and investors should understand other methods and risks before investing.
