Web Directory

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

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

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

» 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.
   http://physics.nist.gov/cuu/Constants/energy.html

» English Weights and Measures
   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,
   http://home.clara.net/brianp/index.html

» How Many?
   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.
   http://www.unc.edu/~rowlett/units/index.html

» International System of Units
   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.
   http://physics.nist.gov/cuu/Units/index.html

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

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

» Metric Scale
   Answers the question "What do ppm, ppb, ppt and ppq stand for?". Includes illustrated examples of sizes in the metric system.
   http://www.cefic.org/metricscale/low_concentration.htm

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

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

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

» SI Units, Conversion and Measurement Skills
   Book by Wacek Kijewski on experimental science in metric units. Includes problems, guided solutions, fun facts, data handling and metric conversion tests.
   http://www.wacek.co.za

» 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.
   http://www.footrule.com/

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

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

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