Conversion of Units – Convert temperature, measurement, heat and energy units, as well as time, velocity and currency.
Dictionary of Units, A – an explanation of the principal systems of units, their history, standards, and conversion factors for changing from one to the other.
Directorate of Time – The U.S. Naval Observatory is the official source of time used in the United States.
How Far Is It? – – distances between 500 cities worldwide plus very basic information about each location
International Standard Date and Time Notation – specifies numeric representations of date and time.
Metric Conversion Card – Use this easy chart to convert inches to centimeters, pounds to kilograms, Fahrenheit to Celsius, and more.
NIST Time and Frequency Division – develops and operates standards of time and frequency
Pictorial Periodic Table, The – growing database, searchable by text or property: Lynx friendly yet modern browser enhanced and it’s fun, too.
Temperature Conversion Calculator – Convert from and to – Fahrenheit, Celsius, Kelvin, Reaumur, and Rankine.
Universal Currency Converter, The – allows you to perform interactive foreign exchange rate conversion on the Internet.
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.
Visual Elements – featuring computer-generated images that interpret the 109 entries of the periodic table
Walk Through Time, A – the evolution of time measurement.
What time is it? – current time, from the US Naval Observatory Master Clock.