SpawnLearnStock Market · 3 MIN READ
P/E ratio: what are you paying for earnings?
Understand the price-to-earnings ratio with a simple calculation, its limitations, and a three-question knowledge check.
By SpawnLearn · Updated
Price needs a reference point
A $20 share is not automatically cheaper than a $100 share. The price-to-earnings ratio puts the share price alongside the company's earnings per share. Divide price by earnings per share to calculate P/E. It is one way to describe how much investors pay for each dollar of annual earnings.
Compare like with like
Trailing P/E uses past earnings; forward P/E uses estimated future earnings. Those estimates can be wrong. Comparing companies makes more sense when the earnings period and business context are similar. Different growth expectations, debt, and risks can help explain different ratios.
A low number is a question, not an answer
A low P/E can reflect modest expectations or earnings that are temporarily unusually high. A high P/E can reflect optimism that never materializes. When earnings are zero or negative, the usual positive P/E comparison stops being useful. Use the ratio to begin investigating a business rather than as a buy signal.
Keep this in mind: Always ask which earnings figure is being used and whether it is sustainable.
Go a little deeper
Three questions. See what sticks.
No account needed. Read the feedback before moving on.
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