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Reference

Calculators Online Center.html 
"This site links to over 10,000 calculators covering everything from agriculture to wind chill."

Convert It! 
Tables to help you convert "just about anything to anything."

Currency Converter 
Get exchange rates for 164 world currencies.

How Much Is That Worth Today? 
Compare the purchasing power of money in the United States (or colonies) from 1665 to any other year including the present.

Measure 4 Measure 
"A collection of interactive sites on the web that estimate, calculate, translate, etc.

MegaConverter.com 
An ever-growing set of weights, measures and units conversion/calculation modules. Allow users to discover things like how many seconds old they are, the difference between a gallon in the USA and a gallon in the UK, how many nanometers in an inch, how many quarts in a chaldron, and what the heck a nebuchadnezzar is. Be careful, you're bound to learn something.

Online Conversion
"Convert just about anything to anything else with the over 5,000 units, and 30,000 conversions. "

Temperature Conversion 
"Convert to and from Celsius, Fahrenheit, Kelvin, Rankine and Reamur scales."

Unit Converter 
"Converts just about every possible measurement, every possible way."