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  1. Conversion Calculator - Use CalculatorPlus's simple and easy to use Conversion Calculator to convert values between different systems of common measurements - in English or other languages using the multilingual translator.
  2. Conversion of Units - Convert temperature, measurement, heat and energy units, as well as time, velocity and currency.
  3. Convert It!
  4. Currency Calculator
  5. Dictionary of Units of Measurement
  6. Greenwich Mean Time (GMT)
  7. How Far Is It? - - distances between 500 cities worldwide plus very basic information about each location
  8. Measurements Converter - friendly JavaScript interface converts length, weight, area, speed, temperature and more, into different units and unit systems.
  9. Megaconverter
  10. Metric Conversion Card - Use this easy chart to convert inches to centimeters, pounds to kilograms, Fahrenheit to Celsius, and more.
  11. NIST Time and Frequency Division - develops and operates standards of time and frequency
  12. Online Unit Conversion - "International Unit Conversion Calculator - Free unit conversion calculator for easy measurement conversion. International Unit Converter allows metric measurement conversions in many categories."
  13. Periodic Table of the Elements
  14. Royal Society of Chemistry: Visual Elements Periodic Table - "The Royal Society of Chemistry’s interactive periodic table which includes Murray Robertson’s Visual Elements artwork. Hover over the elements to see key facts and the supply risk which highlights elements where limited abundance may hinder the production of new technologies. Click the elements for interesting facts, atomic data, isotopes and more."
  15. Unit Conversion Factors
  16. United States Naval Observatory - The United States Naval Observatory (USNO) provides a wide range of astronomical data and products, and serves as the official source of time for the U.S. Department of Defense and a standard of time for the entire United States.
  17. Universal Currency Converter, The - allows you to perform interactive foreign exchange rate conversion on the Internet.
  18. U.S. Metric Association (USMA) - national non-profit organization, founded in 1916, which advocates U.S. conversion to the International System of Units (SI), also called the modern metric system.
  19. WWW Unit Converter
  20. Walk Through Time, A - the evolution of time measurement.
  21. What time is it? - current time, from the US Naval Observatory Master Clock.
  22. World Time Zones Maps with Current Time

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Updated: May 31, 2015
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