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Current Shiller PE Ratio: 28.78 -0.56 (-1.92%)
4:00 PM EST, Fri Dec 14
Mean: 16.59
Median: 15.69
Min: 4.78 (Dec 1920)
Max: 44.19 (Dec 1999)

Shiller PE ratio for the S&P 500.

Price earnings ratio is based on average inflation-adjusted earnings from the previous 10 years, known as the Cyclically Adjusted PE Ratio (CAPE Ratio), Shiller PE Ratio, or PE 10 — FAQ.

Data courtesy of Robert Shiller from his book, Irrational Exuberance.