Reference Shelf: Calculators & Convertors

How much is that?
Ask questions of comparative value covering purchasing power, exchange rates, and other variables between the past and today.

Inflation conversion factors for dollars 1665 to estimated 2015 To convert the value of the dollar in any year from 1665 onward to a current dollar rate, a chart is provided with an annual conversion rate number.

International Salary Calculator Compare salaries and the cost of living in cities around the world.

Martindale's Calculators Online Over 20,000 calculators, from Math and Chemistry, to cooking measurements, to date and calendar conversion.

What's a Dollar Worth? Using the Consumer Price Index calculate what the dollar was worth from 1913 to the present.

Unit Conversion Tool Convert to the metric system. Separate searches for distance, area, volume, mass, speed, temperature, pressure, energy, power, and force.

Universal Currency Convertor Use up-to-the minute currency rates to perform foreign exchange rate calculations.

U.S. National Debt Clock Updated every 5 seconds, this source calculates the national debt of the U.S.