Calculation & Conversion Tools

Websites that assist with mathematical calculations, including online calculators and conversion dictionaries and tables.

Resources in this category:

Asknumbers.com
http://www.asknumbers.com/

Offers conversions covering 27 different categories including: distance, temperature, power, weight, volume, energy, speed, currency, clothing/shoe size, computer storage, and cooking.

Calculator.Com
http://www.calculator.com/

Directory of online calculators, browsable 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."

Common Weights And Measures
http://www.cchem.berkeley.edu/ChemResources/Weights-n-Measur...

Includes Mathematical Notation for Orders of Magnitude, Metric prefixes, and Common U.S. and Metric equivalents

Conversion Factors
http://www.wsdot.wa.gov/Metrics/factors.htm

This site lists conversion relationship between U.S. customary units and SI (International System) units. It gives conversion factors for commonly needed values -- area, length, pressure, force, and volume -- as well as gage standards for things such as sheet metal, wire, and pipes and measures of hardness, stress, and temperature.

Conversion of Units
http://www.chemie.fu-berlin.de/chemistry/general/units.html

A forms based utility that converts values in one unit to any other.

Convert-me.com
http://www.convert-me.com/en/

This Javascript measurements converter provides quick conversions for Weight, Capacity and Volume, Length, Area, Speed, Pressure, Temperature, Circular Measure and Time. Requires a browser capable of handling Javascript. The author adds this disclaimer: "This converter was never intended for high precision calculations."

Convertworld
http://convertworld.com/en/

Convertworld is a unit conversion website. Currency can be calculated for 36 different countries. The date cane also be changed to reflect the most current value of the currencies. Other conversion areas are: length, temperature, weight, data storages, area, energy, pressure, speed, volume, and time. The site is available in English, German, and Portugese.

Cost-Of-Living Calculator
http://www.NewsEngin.com/neFreeTools.nsf/CPIcalc

"This utility allows you to convert dollar values between any two years to adjust for inflation." Uses the Consumers Price Index from the U.S. Bureau of Labor Statistics.

A Dictionary of Measures, Units and Conversions
http://www.cimt.plymouth.ac.uk/siteinfo/exeter404.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'). The units may be found either by looking under the category in which they are used [such as length, mass, density, energy etc.], or else by picking one unit from an alpabetically ordered list of units. There is an outline of the S.I.; a list of its basic defining standards and also some of its derived units; then another list of all the S.I. prefixes and some notes on conventions of usage. There is a short historical note on measures generally; descriptions of the metric system, the UK (Imperial) system with a statement on the implementation of 'metrication' in the UK, and the U.S. system. Finally there is a list of other sources concerned with the topic of measures and units."

A Dictionary of Units of Measurement
http://www.unc.edu/~rowlett/units/

This dictionary includes all units of the International System (SIPM), many other units of the metric system, and those English Customary Weights and Measures (British and American) that are accurately defined. It does not include obsolete units. It provides symbols and abbreviations. A brief overview and history for each measurement system explains the standard for the units of measurement.

The Footrule
http://www.footrule.com/

"Units conversion offering a very extensive range of categories and units. This interactive facility not only converts between units but also includes descriptions of usage and definitions of many of the units."

The 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://oregonstate.edu/cla/polisci/faculty-research/sahr/sah...

Conversion factors to convert US dollars from 1982-1984 and 1995-1999 to equivalent amounts for others years, or vice versa, based on inflation.

Measuring Units Conversion Tables
http://convert.french-property.co.uk/

This site provides conversions "from/to metric and imperial and US measurement systems." It calculates the results and gives the factors for length, area, volume/capacity, mass (weight), and temperature conversions.

The Medical Algorithms Project
http://www.medal.org/

"A Medical Algorithm is any computation, formula, survey, or look-up table, useful in healthcare. We have collected over 1600 algorithms (taken from the biomedical literature, including research journals and textbooks) spanning major medical domains, organized into 43 chapters. To ensure the widest possible audience, the algorithms have been implemented in an Excel workbook which you can freely download to run on your Windows or Macintosh computer. You will need MS Excel, and should be familiar with running spreadsheets." There is also Spanish mirror site linked from this site.

Medieval and Early Modern Data Bank
http://memdb.scc-net.rutgers.edu/

"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/

"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.

Online Conversion
http://www.onlineconversion.com/

Converts just about any unit of measure to any other with over 5,000 units offered for conversion in areas including acceleration, angles, area, astronomy, cooking, clothing, density, energy, finance, frequency, distance, light, temperature, torque viscosity, volume and weight.

The Original Tipping Page
http://www.tipping.org/index.shtml

A guide to appropriate amounts to tip people who provide different kinds of services, including in barbershops and hair salons, casinos, cruise ships, restaurants, and trains.

Periodic Table Toolbox
http://library.thinkquest.org/11771/english/hi/chemistry/per...

"This feature allows you to add different elements together to make a custom compound, which will be displayed with accompanying information such as Atomic Mass and Charge." This site requires Internet Explorer 3.0 or Netscape Navigator 2.0 or higher.

Relocation Salary Calculator
http://www.homefair.com/homefair/calc/salcalc.html

"A 'decent' salary in one city may not take you very far in another. So, if you're planning on moving, considering a job transfer, or thinking about retirement, this site will help in your financial planning. The Center for Mobility Resources, which sponsors the site, maintains cost of living information for 450 cities in the USA. Just plug in your current location and income, type where you're going, and hit 'calculate.'"

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."

Startup Company Valuation Calculator
http://www.caycon.com/valuation.php

This is an educational and humorous multiple-choice quiz for estimating the value of an early-stage company.

Temperature Conversion Calculator
http://www.cchem.berkeley.edu/ChemResources/temperature.html

Calculates conversions to/from degrees Kelvin, Celsius, Farenheit, Reamur, and Rankine scales.

Time Zone Check
http://www.timezonecheck.com/

"The coolest way to find out the time in other parts of the world."

Time Zone Converter - The Time Zone - What time is it in ___?
http://www.timezoneconverter.com/

"Now you can find out the time anywhere in the world with The Time Zone Converter... The time zone rules on which the converter is based are updated whenever local laws or ordinances change to provide you with the most accurate time converter utility on the Net!" Site also provides the ability to "create a customized reference card that you can print and carry with you ... for your next vacation or business trip!"

Travel Tools
http://www.tyzo.com/tools/

A series of helpful tools for use by international travelers, including a world public holidays calendar, a currency converter, maps, a metric converter, weather sites, electricity requirements (by continent and country), dialing codes, a international clothing size chart, and a time zone clock.

The Universal Currency Converter
http://www.xe.com/ucc/

"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 - Money - Calculators
http://www.usatoday.com/money/calculat/mcfront.htm

Offers a host of financial calculators found under the following topics: Mortages, Autos, Credit, Retirement, and Savings. Answers questions like how much you can borrow, what your loan payments will be, how depreciation will effect the value of your car, should you convert your IRA to a Roth IRA, how much it will take to save for a car or home, and much more!

XE.com: The Universal Currency Converter
http://www.xe.com/ucc/

Convert currency at up-to-the-minute market rates amongst all of the World's monies, "over 180 currencies in over 250 geographical locations."