S&P 500 P/E Ratio

As of May 2013, the S&P 500 was trading at 14 times its projected earnings over the next 12 months (source: FactSet). During the market peaks in October 2007 and March 2000, the P/E ratio was 15.2 and 25.6. Its 10-year P/E average (May 2003 to May 2013) was 14.1.