What is P/E Ratio?

The Price-to-Earnings ratio compares a company's current share price to its earnings per share (EPS). It indicates how much investors are willing to pay per dollar of earnings, reflecting market expectations about future growth, profitability, and risk. Higher P/E ratios suggest higher growth expectations.

P/E ratio is one of the most commonly cited valuation metrics in public markets. A P/E of 25 means investors pay $25 for every $1 of current earnings. The ratio can be calculated using trailing earnings (last 12 months) or forward earnings (analyst estimates for the next 12 months). Forward P/E is generally more useful because markets price in future expectations.

P/E ratios vary dramatically by industry and growth stage. High-growth technology companies might trade at 40-100x earnings because investors expect rapid earnings growth. Mature utilities might trade at 12-18x because growth is limited but stable. Comparing P/E ratios across industries is misleading—always compare within the same sector.

In case interviews, P/E ratios help with quick company valuations. If a company earns $500M and the industry average P/E is 15x, you can estimate the equity value at $7.5B. This is a useful sanity check alongside DCF analysis. Be aware that P/E doesn't work for companies with negative earnings.

Real-world example

In 2021, Tesla traded at a P/E ratio exceeding 300x while Ford traded at roughly 13x. This massive gap reflected the market's belief in Tesla's future growth in EVs, energy, and autonomous driving versus Ford's mature business.

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What is P/E Ratio?

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