The scientific calculator:
This is the calculator of choice if you are a student of mathematics. There is more
than meets the eye, be sure to check the calculator's instruction manual and the blog updates. 

The statistics calculator: Lots
of tools for students of statistics, the ever expanding list includes plotting box charts, linear
regression, standard deviation and more... 

The calculator with tape: A calculator for
elementary arithmetic operations that displays operations and results on a virtual paper roll. 

The simple calculator: This flash simple
calculator implements
the 4 basic functions: addition, subtraction, multiplication and division. 

The RPN calculator: Reverse Polish Notation
makes entering complex formulas in a calculator easier, but it takes some practice. Try it on this
javascript based calculator. 

The Abacuses: Javascript is used to emulate the functionality of the abacus on your computer. Try the Chinese and Japanese abaci here. 

Bitcoin mining calculator: If you are planning to start mining for bitcoins, this calculator may be a useful tool to evaluate your approximate average costs and returns. 

Simple Math Calculators: Students of mathematics may find some of these calculators useful for checking their homework...


The percentage calculator: Calculate percentages and percent increase and decrease with this online percentage calculator.


Extcalc:
Alcula's original version of the scientific calculator offers an intuitive interface for simple scientific calculations. 
