All calculations are approximate. The CPI inflation calculator uses the average Consumer Price Index (CPI) for a given calendar year. This data represents changes in prices of all goods and services purchased for consumption by urban households. This index value has been calculated every year since 1913. For the current year, the latest monthly index value is used.
Pretty interesting tid bit of info.
CPI inflation calculator
This is an
ECI inflation calculator for adjusting costs from one year to another using the
Employment
Cost
Index (ECI) inflation index. This inflation calculator is based on the average inflation index during the calendar year. This inflation calculator will compute inflation rates between 1981 and 2003. The Employment Cost Index measures changes in wages, salaries and benefits for civilian workers (private industry plus state and local government).
ECI Inflation Calculator 
Inflation Calculators & Statistics etc. 
Linear Mode
