S&P 500 PE Ratio Chart
Current S&P 500 PE Ratio: 20.08 +0.09 (0.46%)
4:39 pm EST, Fri Dec 19
Mean: 15.53
Median: 14.57
Min: 5.31 (Dec 1917)
Max: 123.73 (May 2009)

Price to earnings ratio, based on trailing twelve month “as reported” earnings.

Current PE is estimated from latest reported earnings and current market price.

Source: Robert Shiller and his book Irrational Exuberance for historic S&P 500 PE Ratio.