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Units of Measurement

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Online Calculators (29) Software (5)

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A Converter - http://www.aconverter.com Features online conversion tools for math, physics and currency.

All Measures - http://www.allmeasures.com/ Conversion table of non-metric measures into SI and CGS.

Ask Numbers - http://www.asknumbers.com Offers a wide variety of unit conversion tools and conversion charts for fast lookup.

British Weights and Measures Association (BWMA) - http://www.bwmaonline.com/ Pressure group opposing compulsory metrication. Political, consumer and transport information, discussion boards and links.

Chinese Numbers - http://www.mandarintools.com/numbers.html Put in a number and get the Chinese representation of that number. Also, converts from Arabic numeral back to the Chinese form.

Conversion Factors for Energy Equivalents - http://physics.nist.gov/cuu/Constants/energy.html 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 Metric - http://www.conversion-metric.org/ Provides a set of unit converters and explanations of each unit.

Convert Center - http://www.convertcenter.com Provides online unit converters

Convert It - http://www.convertit.com Features converter tools for measurement, currency exchange, world time zones, time, finance, driving distance, Roman numerals, atmosphere, and body mass index. Also, has a basic calculator and periodic table.

Convert-Me - http://www.convert-me.com Metric, English old Russian, ancient Greek and Roman, nautical, typographical and astronomical conversions.

Converter.eu - http://converter.eu Provides various online unit conversion tools for area, volume, permeability and so on.

Convertworld - http://www.convertworld.com/ Interactive multi-lingual conversion calculator for a wide variety of units.

eFunda: Units and Constants - http://www.efunda.com/units/index.cfm The index page for units, fundamental constants, and currencies.

English Weights and Measures - http://home.clara.net/brianp/index.html History and usage of English/Imperial/customary weights and measures, with conversion factors, and pictures. Minims, drachms, pecks, bushels, rods, poles, perches, furlongs, ounces, fathoms, pints, gallons, nails, chains, chaldrons, tods, crowns, florins, groats, farthings and guineas.

EngNet Engineering Units Converter - http://www.engnetglobal.com/tips/convert.asp Online calculator provides conversions between a number of common (and not so common) units.

How Many? - http://www.unc.edu/~rowlett/units/index.html A dictionary of units of measurement: explanations of the metric system, System Internationale (SI), English customary system, and other modern measuring systems. Plus extensive links to other measurement-related Internet resources.

iAgora Conversions - http://www.iagora.com/itravel/tools/ Converts temperature, currency, length, and mass.

International System of Units - http://physics.nist.gov/cuu/Units/index.html Definitions of SI units and SI prefixes, units outside the SI, rules and style conventions, historical context for SI units, international aspects of the SI, and unit conversions.

Live Currency Converter - http://www.livecurrencyconverter.com Provides a free online currency converter and the table of different exchange rates

Metric 4 US - http://www.metric4us.com/ A site promoting the metric system which argues why metric is better and English is worse. Provides an English-metric online calculator.

Metric Conversion Tables to Imperial Measurements - http://www.simetric.co.uk/ Standard-to-metric conversion factor tables with definitions, derived units and prefixes.

Metric Conversions - http://www.metric-conversions.org Provides free online conversion tools, which can be added to any websites. It also offers metric conversion tables for download and print.

Metric Scale - http://www.cefic.org/metricscale/low_concentration.htm Explains with many examples the question of "What do ppm, ppb, ppt and ppq stand for?". Includes illustrated examples of sizes in the metric system, from ters- to pico-.

National Measurement Office (UK) - http://www.nmo.bis.gov.uk/ Includes information about the National Measurement System, legislation and guidance, services to industry, and its enforcement role.

NIST Metric Information and Conversions - http://ts.nist.gov/WeightsAndMeasures/Metric/mpo_home.cfm Factsheets, regulations and conversion tools. Official site of the United States Metric Program.

Online Conversion - http://www.onlineconversion.com/ Offers conversion tools for length, volume, temperature, astronomical, clothing sizes, computer bytes, cooking measurements, time zones, density, energy, finance, flow rates, force frequency, and some fun pages.

Sensible Units - http://www.sensibleunits.com Converts various units to more tangible units or objects.

SI Guide - http://www.metricmethods.com/SIguidelines.html Provides translation of unit and prefix names for the international metric system (SI) into various languages. For some, transliterations are also given.

Smart Conversion - http://www.smartconversion.com Offers online unit conversion and calculation tools with corresponding math formulas. Plus conversion validation and unit lookup tools.

The Converter Site - http://www.theconvertersite.com Includes online conversion and calculation tools. Possible to change the precision of the result.

The Foot Rule - http://www.footrule.com/ 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.

The Metric System - http://www.essex1.com/people/speer/metric.html Outline of the metric system with emphasis on applications in physics.

UK Metric Association - http://www.ukma.org.uk/ Pressure group campaigning for the completion of metrication in the UK. History, legislation, and practical help.

Unit Conversion - http://www.unitconversion.org Provides a free online conversion tool to easily convert between different units of measurement in more than 70 categories.

Unit Conversion and Reference Tables - http://www.chemie.fu-berlin.de/chemistry/general/index_en.html Features converters for physical constants, SI units, temperature, currency, and temperature.

Unit Conversions - http://www.chemie.de/tools/units.php3 Online conversions from physics units to other physics units. Includes a comprehensive set of units with definitions.

Unit Converter - http://unit-converter.org Conversion tools for different types of units in different languages.

Unit Easy - http://www.uniteasy.com Provides a set of unit converters with related information of each unit. Also it is possible to change the number system of the result.

Unit Juggler - http://www.unitjuggler.com/ Provides unit conversion tools for various math and physical units in different languages.

Units of Measurement - http://www.themeter.net/index_e.htm Conversions and equivalences of the principal units of measure of the SI and Anglo-Saxon systems.

WWW Unit Converter - http://www.digitaldutch.com/unitconverter/ Converts area, density, energy, force, length, mass, power, pressure, speed, temperature and volume, bits and bytes.

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