What is the P/E Ratio?

The Price-to-Earnings (P/E) ratio is one of the most widely used stock valuation metrics. It compares a company's stock price to its earnings per share, helping investors understand how much they're paying for each dollar of earnings.

The P/E Ratio Formula

P/E Ratio = Stock Price / Earnings Per Share (EPS)

Alternatively: P/E = Market Capitalization / Net Income

Types of P/E Ratios

Trailing P/E (TTM)

Uses earnings from the past 12 months. This is the most common P/E calculation because it's based on actual reported earnings.

Forward P/E

Uses projected earnings for the next 12 months. Useful for evaluating growth expectations, but depends on analyst estimates.

Shiller P/E (CAPE)

Uses average inflation-adjusted earnings over 10 years. Smooths out business cycle fluctuations for longer-term valuation.

How to Use This Calculator

1. Enter the current stock price
2. Choose how to input earnings (EPS directly or total earnings + shares)
3. Enter the earnings data
4. Optionally enter industry average P/E for comparison
5. Click "Calculate" to see results

Interpreting P/E Ratios

• High P/E (>25): May indicate growth expectations or overvaluation
• Average P/E (15-25): Typical range for established companies
• Low P/E (<15): May indicate value opportunity or concerns about the company

Important Considerations

• Compare P/E within the same industry
• Consider earnings growth rate (PEG ratio)
• Negative earnings result in no meaningful P/E
• One-time events can distort earnings