S&P 500 PE Ratio Chart
Current S&P 500 PE Ratio: 18.76 +0.08 (0.41%)
4:30 pm EDT, Tue Apr 22
Mean: 15.51
Median: 14.54
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.