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ValuationTTM P/E

What is Price-to-Earnings TTM (TTM P/E)?

The Trailing Twelve Months (TTM) P/E ratio uses the actual reported earnings from the past four quarters, making it entirely backward-looking. It is the most commonly quoted P/E ratio because it is based on real, audited numbers rather than forecasts. Value investors generally prefer TTM P/E over forward P/E (which relies on analyst estimates that are often optimistic).

Formula

TTM P/E = Current Share Price / Earnings Per Share (Trailing 12 Months)

Why Value Investors Prefer TTM Over Forward P/E

Forward P/E sounds more sophisticated -- after all, the value of any asset is the present value of its future cash flows, not past ones. But forward P/E relies on sell-side analyst estimates that have a well-documented upward bias. Companies guide analysts to beatable estimates, and analysts who cut earnings forecasts can lose access to management. The result is that forward P/E almost always looks lower (cheaper) than TTM P/E, creating a systematic illusion of value.

Benjamin Graham built his entire framework around trailing earnings, requiring that a stock trade below 15x the average earnings of the past three to seven years. This normalization approach smooths out one-time items and cyclicality without requiring forecasts. For investors seeking a true margin of safety, the verifiable past is a more honest foundation than the optimistic future.

Compare TTM P/E with Forward P/E

Forward P/E uses next-12-months estimates. Learn how the two ratios diverge and when each is more useful for assessing valuation.

Learn About Forward P/E →

Frequently Asked Questions

What is TTM P/E and how does it differ from forward P/E?+
TTM P/E (Trailing Twelve Months Price-to-Earnings) uses the actual reported EPS from the last four fiscal quarters. Forward P/E uses analyst consensus estimates for the next 12 months. TTM P/E is based on verified, audited results -- it cannot be revised down after the fact. Forward P/E relies on analyst forecasts that are systematically optimistic (analysts who cut estimates lose access to management). For value investors seeking a margin of safety, TTM P/E is the more conservative and reliable starting point.
What is a good TTM P/E ratio?+
Below 15 is generally considered value territory for established businesses -- Benjamin Graham's rule of thumb was a P/E of 15 or lower as a signal of fair to cheap pricing. The S&P 500 long-run average TTM P/E is approximately 16-17x. A TTM P/E above 25 implies the market expects significant earnings growth -- which may or may not materialize. The appropriate TTM P/E benchmark varies by industry: capital-intensive sectors (utilities, industrials) tend to trade at lower multiples; asset-light businesses with pricing power (software, consumer staples brands) at higher multiples.
When is TTM P/E misleading?+
TTM P/E distorts when earnings are artificially high or low relative to a normal cycle. At cyclical peaks, commodity companies, banks, and industrials show high earnings (low P/E) just before a downturn -- making them look cheap when they are actually expensive on normalized earnings. At cyclical troughs or after large write-offs, reported EPS is depressed (high P/E or negative), making the business look expensive when it may be cheap. One-time items -- litigation settlements, asset sale gains, restructuring charges -- can also distort TTM EPS significantly. Always check the trailing four quarters for outliers before relying on the TTM P/E.
What is CAPE (Shiller P/E) and how does it improve on TTM P/E?+
The Cyclically Adjusted P/E (CAPE), developed by Robert Shiller, uses the average of 10 years of real (inflation-adjusted) earnings rather than the last 12 months. By smoothing over a full economic cycle, CAPE eliminates the distortion caused by peak and trough earnings. The 10-year averaging means a single boom year or a single recession year does not dominate the denominator. CAPE is most useful for market-level valuation assessment -- the current CAPE vs. historical average -- rather than individual stock analysis, where 10-year earnings histories may reflect a very different business.

Related Terms

Forward P/E Ratio

Price divided by next 12-month estimated EPS

P/E Ratio

The standard price-to-earnings multiple

Earnings Per Share

Net income divided by diluted shares outstanding

PEG Ratio

P/E ratio divided by earnings growth rate

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