A set of calculators and converters for historical exchange rates, purchasing power, and related data. Specific topics include:

• What Is the Relative Value? Five Ways to Compare the Worth of a United States Dollar, 1789 - 2003
• The Annual Real and Nominal GDP for the United States, 1789 - 2003
• The Annual Real and Nominal GDP for the United Kingdom, 1086 - 2000
• What Were the UK Earnings and Prices Then? 1264 - 2002
• Purchasing Power of the United States Dollar, 1665 - 2003
• Purchasing Power of the British Pound, 1264 - 2002
• Inflation Rates for the U.S. (1666 to 2003) and United Kingdom (Britain) (1601 to 2003)
• The Price of Gold, 1257 - 2001
• The Relative Cost of Unskilled Labor in the United States, 1774 - Present
• Exchange Rate Between the United States Dollar and Forty Other Countries, 1913 - 1999
• Exchange Rate Between the United States Dollar and the British Pound, 1791 - 2000
• Interest Rate Series for the United Kingdom and the United States, 1790 - 2001