Inflation can badly skew the way one views a property's value. Much of the increased valuation may be accountable to inflation and not an increase in real value. This is an inflation calculator for adjusting costs from one year to another using the Gross Domestic Product (GDP) Deflator inflation index. This inflation calculator is based on the inflation rate during the US Government Fiscal Year, which begins on October 1 and ends on September 30. This inflation calculator will compute inflation from 1940 to 2009 (est).