Inflation is an increase in the general price level of the economy, or conversely a decrease in the value of money.
Because there are many different ways to define inflation, there are many different ways to calculate it.
- Six Ways to Compute the Relative Value of a U.S. Dollar Amount, 1774 to Present
- Measuring Worth
- The Inflation Calculator
- An inflation research site and personal inflation rate calculator
- Inflation: What the heck is it? by Mike Shedlock
- Current Value of Old Money includes links to several calculators.