Calculation and Conversion Tools
Calculators
A directory of online calculators and calculating tools. Both numeric and scientific calculators as well as unit and currency converters.
Enter any dollar amount and compare its value during any two years between 1800 and 1998.
Conversion Tools
Measurement
From the College of Chemistry at UC Berkeley, this site includes mathematical notation for orders of magnitude, metric prefixes, and common U.S. and metric equivalents.
A Dictionary
of Measures, Units and Conversions
A summary of measurement systems from around the world with descriptions of units of measure that can be chosen from subject oriented or alphabetical lists. Also includes the standard unit, S.I. ('Systeme International'), and conversion tables for it.
megaConverter.com is an ever-growing set of weights, measures and units conversion/calculation modules. For just about anything you can think of, megaConverter can show you its equivalent.
Currency
A currency converter which contains the exchange rates for 164 currencies. Also includes historical currency exchange rates and can make forcasts for global markets
The Universal Currency Converter
Interactive online currency converter that allows you to put in a dollar amount then select the two currencies to compare.
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