Dave's Inflation Calculator
What was that dollar worth in the past...or future?
This calculator uses a single inflation rate for the whole time period. This, of course, assumes you know the correct average for that time period. The recent U.S. average rate is 3.1%. Of course, it's impossible to truly predict into the future. Rates have varied wildly. Take a look at the chart below. We've hardly seen any deflation since the 1950s, but before that, it was just as common as inflation. Obviously, this simplistic calculator won't be accurate for all spans of time in the past unless you know the average between then and now.