Glossary / Valuation

P/E Ratio

The P/E ratio, or price-to-earnings ratio, compares a company's share price with its earnings per share. It is a quick way to ask how much investors are paying for each dollar of current or expected earnings.

Why it matters

A P/E ratio helps investors compare valuation across companies, sectors, and market periods. A higher P/E can mean investors expect faster growth, more durable profits, lower risk, or stronger capital returns. A lower P/E can mean the market expects slower growth, cyclical pressure, balance sheet concerns, or declining earnings.

How to use it carefully

Do not treat a low P/E as automatically cheap or a high P/E as automatically expensive. Earnings quality matters. A company with one-time gains may look cheaper than it is. A company investing heavily for future growth may look expensive on current earnings but more reasonable on normalized future earnings.

Common variants

• Trailing P/E: uses earnings from the last 12 months.
• Forward P/E: uses expected earnings, which can change when estimates are revised.
• Sector-relative P/E: compares a company against peers with similar business models.