S&P 500 PE Ratio Chart
Current S&P 500 PE Ratio: 19.33 +0.07 (0.37%)
1:59 pm EDT, Tue May 21
Mean: 15.49
Median: 14.51
Min: 5.31 (Dec 1917)
Max: 123.79 (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.