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Online calculator  with arithmetic operations and ln. exp, x2, root, sin, cos, and tan functions
The ultimate collection of online calculators
The MegaConverter  
The web's best place to figure what equaks what 
Martindale's 'The Reference Desk: Calculators On-Line'
The SuperMarket of converters. Convert anything to almost everything.
Contains over "23,825" Calculators & Spreadsheets, 
over "3,835" Courses, Lectures, Manuals, Handbooks, & "1,000's" of Movies, Videos, Simulations & Animations 
The spectroscopy tools
A fast and quick online tool to identify what chemical groups belongs to a spectral range including  NMR (1H, 14C), Mass spectroscopy and IR 
Metric System
This site gives you everything that you wanted to know about the Metric System 
Chemistry converter
Very extensive list of chemistry calculators links including concentration, diffusivity, viscosity, enthalpy, entropy, heat transfer coefficients and
Engineering, Scientific Unit Converter
A Dictionary of Measures, Units and Conversions
A Dictionary of Units of Measurement
Conversion of Units  
Institute of Chemistry and Biochemistry of Berlin
Astro-Physical Calculator
Diet Calculator
Calorie Calculator
Based on activity
Local Times Around the World
Euro convertor to the main currency
Universal Currency Converter

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