P/E ceiling explained: EPS times the multiple you will pay
Learn the P/E price ceiling formula, how to choose a target multiple, and why normalized earnings beat a single year of EPS.
A P/E ceiling multiplies earnings per share by the highest price-to-earnings ratio you are willing to pay. If a company earns $5.00 per share and you will not pay more than 15 times earnings, your ceiling is $75. It is one of the simplest ceilings and works best for profitable companies with steady earnings.
This guide covers the formula, how to choose a sensible multiple, and why using one year of earnings can mislead you. Educational only.
The formula and what it means
The P/E ratio is price divided by EPS. Rearranged, price equals EPS times P/E. Setting the P/E to your maximum acceptable multiple gives you the highest price that satisfies your rule.
The inverse of P/E is the earnings yield. A P/E of 15 is an earnings yield of about 6.7%, which is what the company earns for each dollar of stock price. Thinking in earnings yield lets you compare stocks directly with bonds.
P/E ceiling = EPS × Target P/E Earnings yield = 1 ÷ P/E
Choosing a target multiple
The target should reflect growth, quality, and the interest rate environment. Graham suggested a maximum of 15 for defensive investors. Faster-growing companies can justify more, and cyclical or slow-growth ones less.
- Compare with the company’s own five- to ten-year median P/E.
- Compare with peers in the same industry.
- Go lower when interest rates are high, because bonds offer a competing return.
- Go lower when earnings are volatile, since the multiple is applied to an unreliable number.
Use normalized earnings, not a single year
One year of EPS can be unusually high or low. A cyclical company earning a peak profit looks cheap on a P/E, which is exactly when it is most expensive. Use an average of several years to smooth the cycle.
Suppose a manufacturer earned $6.20, $3.10, $4.80, $5.50, and $5.90 per share over five years. The average is $5.10. At a target P/E of 15, the ceiling is $76.50, and with a 10% margin of safety about $68.85. If you had used the peak $6.20, you would have set a ceiling of $93.
- Collect five years of diluted EPS from the annual reports.
- Remove clear one-time gains or charges if you can identify them.
- Average the figures to get normalized EPS.
- Multiply by your target P/E and apply a margin of safety.
When a P/E ceiling does not work
The method fails with negative or near-zero earnings, for young growth companies reinvesting everything, and for REITs where depreciation distorts EPS. In those cases use sales multiples, AFFO, or a dividend-based approach instead.
Even for suitable companies, treat the P/E ceiling as one of two or three methods. When P/E and dividend yield ceilings agree, you can have more confidence in the price.
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