Conversions and Calculations

Financial Calculators
Variety of calculators including loan amortization, retirement planning and loan acceleration.
Universal Currency Converter Interactive foreign exchange rates.

Chemical Calculations
Chemical calculation programs developed by Cambridge University professor.
Constants and Equations Pages
In addition to information on over 1000 constants and equations, this Institute of Physics sponsored site includes conversions, the periodic table and astronomical information.
Conversion of Units
Institute of Chemistry site which allows you to convert between a wide selection of scientific units.
Unit Conversion Calculators Allows you to convert between various English and metric units.

Calculate Day of Week
Calculate the Day of the Week for a Given Date from 1 January 1583 to 31 December 4000.
Calendar Converter
Allows you to interconvert dates in a variety of calendars such as the Gregorian calendar, the Islamic calendar and the Hebrew calendar.
Compute Sunrise, Sunset Worldwide
Calculates sunrise, sunset for anywhere in the world, on any date.
Number of Days Between Dates
Perpetual Calendar World Time Server
World Time Server provides local times worldwide. It makes real time adjustments for Daylight Saving Time.