Calculator.Com
http://www.calculator.com/
Directory of online calculators, browseable by a hierarchical subject/function directory. "There are calculators for finance, business, and science. There are ones for cooking, hobbies, and health. Some solve problems, some satisfy curiosity, and some just for fun."

Dictionary of Measures, Units and Conversions
http://www.ex.ac.uk/cimt/dictunit/dictunit.htm
"This provides a summary of most of the units of measurement to be found in use around the world today (and a few of historical interest), together with the appropriate conversion factors needed to change them into a 'standard' unit of the S.I. ('Systeme International')."

Inflation Calculator
http://www.westegg.com/inflation/
At this site, you can enter any dollar amount and compare its value during any two years between 1800 and 1998. For example, you can compare the worth of $100 in 1880 to its worth in 1950.

Inflation Conversion Factors
http://www.orst.edu/Dept/pol_sci/fac/sahr/sahr.htm
Conversion factors to convert US dollars from 1982-1984 and 1995-1999 to equivalent amounts for others years, or vice versa, based on inflation.

Medieval and Early Modern Data Bank (MEMDB)
http://www.scc.rutgers.edu/memdb/
"The Medieval and Early Modern Data Bank is a project established at Rutgers University and originally cosponsored by the Research Libraries Group (RLG), Inc. Its aim is to provide scholars with an expanding library of information in electronic format on the medieval and early modern periods of European history, circa 800-1815 C.E. MEMDB contains five large data sets, three pertaining to currency exchanges and two pertaining to prices."

megaConverter
http://www.megaconverter.com/cv_start.htm
"megaConverter.com is an ever-growing set of weights, measures and units conversion/calculation modules. megaConverters 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."

OANDA
http://www.oanda.com/
This site offers a multilingual currency converter which contains the exchange rates for 164 currencies. Travelers can print out a cheat sheet: "a multi-value table of an exchange rate to facilitate calculations while you travel." The site also offers historical charts of exchange rates and forecasts for global markets.

Roman Numeral Date Conversion Table
http://www2.inetdirect.net/~charta/Roman_numerals.html
"This page is intended as a guide to deciphering Roman numeral year dates as they are commonly found in the imprints of both modern and early printed books. It explains the basic principles for converting numbers from Roman to Arabic form and also describes some of the unusual features of Roman numerals that may be encountered in older books."

Temperature Conversion Calculator
http://www.cchem.berkeley.edu/ChemResources/temperature.html
Calculates conversions to/from degrees Kelvin, Celsius, Fahrenheit, Reamur, and Rankine scales.

Universal Currency Converter
http://www.xe.net/currency/
"The Universal Currency Converter allows you to perform interactive foreign exchange rate conversion on the Internet. Type the amount of source currency in the input box. You may include commas and a decimal point. Select the source and destination currencies using the scrolling selection boxes."

USA Today Calculators
http://www.usatoday.com/money/perfi/calculators/calculator.htm
"CONSUMER LOAN - Find out what the monthly payment would be, compare different interest rates and repayment periods. You provide loan amount, loan interest rate and length of payment. It returns the estimated monthly payment.

USA Today Calculators
http://www.usatoday.com/money/perfi/calculators/calculator.htm
TUITION - Calculate how much you should be saving today to cover tomorrow's tuition. Provide prospective student's current age, age when they will attend school, current annual tuition, currention tuition inflation rate, years to be spent in school, amount currently saved/invested, and the current annual rate of return on the amount saved/invested. It returns the monthly amount needed to cover the total tuition cost.

USA Today Calculators
http://www.usatoday.com/money/perfi/calculators/calculator.htm
NEW CAR - Compare the costs of leasing vs. buying a car new. You provide lease information: down payment, licensing fees, monthly lease payment, and car value at the end of the lease. Buying information: sales tax, car loan interest rate and length of repayment. It returns the total cash payment and a comparison of leasing and financing costs during the loan repayment period.

USA Today Calculators
http://www.usatoday.com/money/perfi/calculators/calculator.htm
MORTGAGE - Compare mortgage interest rates and repayment periods. You provide loan principal, interest rate and mortgage repayment periods. It returns the estimated monthly payments.

USA Today Calculators
http://www.usatoday.com/money/perfi/calculators/calculator.htm
RETIREMENT - Tells you how much you need to save today in order to retire in comfort later. You provide current age, planned retirement age, desired monthly retirement income, expected Social Security income, money already saved/invested and anticipated return on savings/investments. It returns the monthly amount need to reach retirement goal."

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