From the Dept. of Probably useless Facts

Economic History Resources - What is its Relative Value in U.S. Dollars?:
"Presented here are five series for making such comparisons in US dollars between any two years from 1789 to 2003. They are the CPI, the GDP Deflator, the unskilled wage rate, the GDP per capita, and the GDP.


One or more of the series may be most appropriate for you depending on the nature of your query. See below for the definitions of the series and some examples.

You can make this computation among all the years between 1789 and the present."

roll your own, here