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Online Calculators

What is a Calculator?

A calculator is a device for performing mathematical calculations, distinguished from a computer by having a limited problem solving ability and an interface optimized for interactive calculation rather than programming. Calculators can be hardware or software, and mechanical or electronic, and are often built into devices such as PDAs or mobile phones.
 

Modern electronic calculators are generally small, digital, (often pocket-sized) and usually inexpensive. In addition to general purpose calculators, there are those designed for specific markets; for example, there are scientific calculators which focus on advanced math like trigonometry and statistics, or even have the ability to do computer algebra. Also graphing calculators can be used to graph equations. Modern calculators are more portable than most computers, though most PDAs are comparable in size to handheld calculators.

Unit Conversion

The process of conversion depends on the specific situation and the intended purpose. This may be governed by regulation, contract, Technical specifications or other published standards. Engineering judgment may include such factors as:

• The precision and accuracy of measurement and the associated uncertainty of measurement
• The statistical confidence interval or tolerance interval of the initial measurement
• The number of significant figures of the measurement
• The intended use of the measurement including the engineering tolerances
• Some conversions from one system of units to another need to be exact, without increasing or decreasing the precision of the first measurement. This is sometimes called soft conversion. It does not involve changing the physical configuration of the item being measured.

By contrast, a hard conversion or an adaptive conversion may not be exactly equivalent. It changes the measurement to convenient and workable numbers and units in the new system. It sometimes involves a slightly different configuration, or size substitution, of the item.

Unit Conversion Resources and Calculators

Following is a list of various online calculators and online converters:

ABE Volume Calculator Page	A collection of volumetric calculators for a variety of shapes. Including cylinder sphere barrel pyramid and dome.
Allchin Measurements Converter	Converts common measurements from metric to imperial and vice versa, with other systems included for selected quantities such as light years, picas, and Old Russian measures.
Body Height Weight Converter	Converts from American to metric units and vice versa.
Calculate for Free	A variety of tools for determining an array of metrics and measurements.
Calculator.com	Online calculators for a variety of conversions and calculations.
Calculator City	Includes tools to solve equations like Includes calculators for velocity, density, financial, geometry, algebra, calculus, astronomy, chemistry, physics and webpage color coders. Also, has trivia fact pages, such as state demographics and presidents.
Chinese Numbers	Chinese Numbers converter. Find Chinese equivalents to English numbers.
Convert It	Conversion calculator of physical measurements. Includes metric and English units and also a large range of other possible conversions.
Conversion Factors for Energy Equivalents	Physics laboratory of the National Institute of Standards and Technology (NIST) sponsors and maintains this reference resource of CODATA-recommended values of fundamental physical restraints.
Conversion of Units	Database of conversion factors and a calculator.
EngNet Engineering Units Converter	Online calculator provides conversions between a number of common (and not so common) units.
eFunda: Units and Constants	The index page for units, fundamental constants, and currencies.
The Foot Rule	Convert units from one measure to another (e.g. meters to yards, liters to gallons). A very extensive collection of units and categories. Includes usage and definitions descriptions of units and categories.
GoConvert	A comprehensive site for conversion calculations. Convert 165 currencies and hundreds of measurements.
iFigure	Provides links to online calculators and worksheets. These are interactive, educational tools that provide information to help in planning, solving and making decisions for a variety of problems and tasks that come up daily.
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Martindale's Calculators	An extensive collection of calculators for the sciences, business and everyday measurements. Organized by subject area.
Math Connect	Provides calculations of various types including metric conversion.
MegaConverter	Resource for units, weights, measures, calculators and converters.
Online Conversion	Convert just about Anything to Anything else Over 8,100 Conversions and Calculators
Physics Calculator	This RPN calculator implements arithmetic and scientific operations and functions, as well as predefined physical constants.
Science Made Simple	Online metric converter gives U.S. customary and metric conversions.
Unit Conversion Tools	Unit Conversion tools and resources
Unit conversion and Reference Tables	A very handy unit conversion, nearly every known unit is listed here.
MrCalculator	A collection of calculators that run in your web browser.
Dario Alpern's Complex Number Calculator	Computes basic operations, 1/z, pi, exponent, log, trig, and polygamma functions. Includes memory feature.
Ron's Hard Conversion Tools	Online unit conversion calculators for volume, distance, weight, and temperature units. Also includes number conversion (decimal, hex, and binary) and a tool to convert characters to or from ASCII codes.
KW Liquid tank Heating calculator	To determine kW required to raise the temperature of any Liquid
Conversions-R-Us	Convert units of measurements, bases, and PPT, RTF, DOC, and XLS files to HTML.
Schmidt R Value Conversions	Convert Schmidt R Values to PSI or N/mm2
Unit Conversion and Day of the Week	Over 100 conversion factors such as inches to centimeters, gallon to cubic meters or even curie to Becquerel. Includes instructions as to how to use the conversion factors in your calculations.
Prefix Conversion Calculator	Conversion Calculator for Prefixes
Online Calculators.net	Online Calculators provide free online JavaScript calculators and converters for unrestricted use
Convertalot	Collection of free Java measurements converters, calculators, unit translators and Java Games with downloadable source code and zip files.
iAgora Conversions	The most complete Unit Conversion Engine around - supports calculations involving temperature, length, mass, and more; Along with a Traditional Conversion Table.
MIT 3.091 Units Converter	A tool for engineers and others to convert from almost any set of units to any other.
Online Unit Converter	Personalizable, free, and available in five languages. It converts distance and length, area, capacity and volume, pressure, temperature, and speed.
On-Line Measures Converter	Length, area, mass and weight, volume and capacity, temperature, angles, force, torque, electrical, cloth sizes, and some others.
WWW Unit Converter	Converts area, density, energy, force, length, mass, power, pressure, speed, temperature and volume, bits and bytes.