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Weights and Measures
AskNumbers.com: Metric and Imperial Unit Converters and Conversion Tables
Links to conversion tools for measurements of density, flow rate, light, sound, calories, and many other types of measures.
Calculators for a wide variety of functions including budget, date/time, conversions, grade/GPA, taxes, volume, and more.
International System of Units (SI)
From the U.S. National Institute of Standards and Technology, includes a brief summary of the International System of Units (SI), the modern metric system of measurement. Includes lists of units and prefixes; rules and style conventions; conversions; definitions; and history.
Martindale's Calculators On-Line Center
Contains links to online calculators designed for every imaginable purpose: mathematics, physics, engineering, photography, nutrition, sports, currency, weather, etc.
Resource for converting date/time, length/distance, temperature, speed, volume, weight, and much more.
Includes a wide assortment of calculators and conversion resources. Covers length, temperature, area, volume, weight, and time, as well as categories such as engineering, heat, fluids, light, electricity, and more.
WebElements Periodic Table of Elements
Click on an element for detailed information, description, and data.