I?m looking for an interactive website that will calculate the current
and past value of the US dollar based on one of the consumer price
indexes (or other indexes).  Something similar to the way Oanda.com
will calculate currency exchange rates for past dates.

Hello Ezeques,

Below you will find four resources that should serve your purpose.


What is a dollar worth?
http://www.minneapolisfed.org/Research/data/us/calc/

?The Consumer Price Index (CPI) is a measure of the average change in
prices over time in a market basket of goods and services.

Directions: Enter years as 4 digits (i.e. 1913) through 2005. Enter
dollar amount without commas or $ sign in box on first line. Click
Calculate button to compute dollar amount shown on second line.?

Source: Federal Reserve Bank of Minneapolis
http://www.minneapolisfed.org/Research/data/us/calc/index.cfm

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Inflation Calculator


The following form adjusts any given amount of money for inflation,
according to the Consumer Price Index, from 1800 to 2005.
http://www.westegg.com/inflation/

Instructions: 
Enter the amount of money: (don't use any commas in the numbers...)
Enter the initial year (1800-2005):  
Enter the final year (1800-2005):  
Submit

Source: The pre-1975 data are the Consumer Price Index statistics from
Historical Statistics of the United States (USGPO, 1975). All data
since then are from the annual Statistical Abstracts of the United
States.

Inflation Calculator
http://www.westegg.com/inflation/

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Bureau of Labor Statistics also provides an Inflation Calculator
http://www.bls.gov/cpi/

Instructions:
Under Get Detailed CPI Statistics, select the Inflation Calculator link. 

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What is its relative worth in dollars?

Economic History Services presents  five series for making 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.
http://eh.net/hmit/compare/

Economic History Services
http://eh.net/hmit/ppowerusd/


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Search terms used: 
Dollar calculator 1900..2005
://www.google.com/search?hl=en&lr=&c2coff=1&rls=GGLD%2CGGLD%3A2005-18%2CGGLD%3Aen&q=Dollar+calculator+1900..2005&btnG=Search


I hope this is helpful. If this is not the precise information you
require, please let me know before you rate my answer and I will
resume my search.

Best Regards,
Bobbie7

Perfect! Thanks. 

PS: And they are asking for a tip! This is amazing...I am still amazed
and I have been on the Internet since even BEFORE the days of The
Source and GEnie.

Thank you for the five stars and tip!
--Bobbie7