Frequently Asked Questions
What is the difference between trailing and forward P/E?
Trailing P/E uses the last 12 months of actual earnings (TTM). Forward P/E uses analyst estimates for the next 12 months. Forward is more relevant for valuation but depends on the accuracy of estimates, which tend to be optimistic.
What is a "normal" P/E ratio?
The S&P 500 has averaged about 16-17x earnings historically. Sector medians vary widely: tech ~28x, energy ~12x, REITs ~35x (FFO basis), utilities ~18x, financials ~12x. Always compare a stock to its sector, not the broad market.
What does the Shiller (CAPE) P/E add?
CAPE uses 10-year inflation-adjusted earnings to smooth out economic cycles. A CAPE above 30 has historically signaled lower forward 10-year returns. As of 2025 it sits in the low 30s, well above the long-term average of about 17.
When is a low P/E a value trap?
When earnings are about to decline (cyclicals at peak), the business is structurally impaired (declining moat), or accounting is aggressive. Pair P/E with debt levels, free cash flow, and revenue trends before declaring something cheap.
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This calculator provides estimates for educational purposes only and is not investment advice. Past performance does not guarantee future results. Consult with a qualified financial advisor before making investment decisions. All investments carry risk, including potential loss of principal.