The CPI inflation calculator uses the average Consumer Price Index 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.

LINK: Inflation Calculator

Year	Name	DBP	Picture
1941-1945	Franklin D. Roosevelt	$14.88
1945-1948	Harry S. Truman	$9.08
1949-1953	Harry S. Truman	$8.19
1953-1961	Dwight D. Eisenhower	$7.32
1961-1963	John F. Kennedy	$7.15
1963-1965	Lyndon B. Johnson	$6.95
1963-1969	Lyndon B. Johnson	$5.96
1969-1973	Richard M. Nixon	$4.93
1973-1974	Richard M. Nixon	$4.44
1974-1977	Gerald R. Ford	$3.61
1977-1981	Jimmy Carter	$2.41
1981-1989	Ronald Reagan	$1.76
1989-1993	George Bush	$1.51
1993-2001	Bill Clinton	$1.24
2001-2009	George W. Bush

Does anyone know what the buying power of a dollar today?