Stock market basics · Intermediate

The P/E Ratio Explained

A 1-minute lesson from the MarketPro academy, one of 18 in stock market basics.

Last reviewed 15 September 2026 by the MarketPro research desk · Editorial policy

Short answer

The price-to-earnings ratio, or P/E ratio, is one of the most commonly referenced tools for gauging how a stock's price compares to the company's profitability. It is calculated by dividing the current share price by the company's earnings per share.

What the Ratio Suggests

A higher P/E ratio can suggest that investors expect stronger future earnings growth, or simply that the stock is priced richly relative to current profits.
A lower P/E ratio can suggest the market has more modest growth expectations, or that the stock may be undervalued—or it may reflect genuine concerns about the business.
P/E ratios are most meaningful when compared across similar companies in the same industry, since typical ratios vary widely between sectors.

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There are variations of the metric, such as using trailing twelve months of earnings versus analysts' forward earnings estimates, which can produce noticeably different results for the same company.

The P/E ratio has real limitations. It does not work for companies with no earnings or negative earnings, it can be distorted by one-time accounting events, and it says nothing directly about growth rates, debt levels, or cash flow. Relying on a single ratio in isolation, without broader context about the company and its industry, can lead to a misleading conclusion about whether a stock is attractively priced.

Step 5 of 10 on Stocks & Indices Basics

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Written and reviewed by the MarketPro research desk

MarketPro is a trading-signal and trading-education app operated by Harajuku Holdings LTD (Cyprus). Our signal desk publishes and tracks every trade idea in-app, and every page here is checked against the app's live behaviour before publishing. Last reviewed 15 September 2026. How we produce signals and content · About MarketPro

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