During this period, the S&P 500 (excluding dividends) has a nominal annualized rate of return of 8.70% and inflation averaged 3.77% for a real (inflation-adjusted) return of 4.75% (see note below). If dividends were reinvested, the nominal rate of return would have been 10.92% or 6.88% after inflation adjustment. View Data as a Table | Monthly Inflation Data
Note: Most people estimate the inflation-adjusted rate of return (often called the real rate of return) by subtracting the inflation rate from the return. However, the correct formula looks like this:
where k is the real rate of return, r is the nominal return and i is the rate of inflation. Thus, the simple estimate of the real rate return would be 4.93% (8.70% minus 3.77%). The true real rate, however, is 4.75%.
The S&P 500 returns are based on data from Yahoo! Finance.