Supercalc

SuperCalc is a powerful alternative to the standard calculator that comes with Windows. SuperCalc also includes a powerful expression evaluator that allows you to enter entire equations rather than only 1 operation at a time as on normal calculators.

This more natural form of calculation entry greatly increases ease of use. Additionally it has a variable stack that lets you assign values (which may be a expression to be solved) to variables for use later. Commonly used equations can also be stored for retrieval later