Free scientific calculator software for windows

MPCalcRB is a multi-precision RPN scientific calculator. It can handle numbers with up to 30,000 digits. It can also handle numbers whose absolute values lie between about 10^-40000000 and 10^+40000000.
The popup menu selects from three keypads. There are keyboard equivalents for the functions. Over forty scientific functions are now available.

Scientific and Business RPN Calculator with :
- mouse operated, with mouse "keypad"
- standard functions
- trigonometric functions
- finance functions
- RPN (Reverse Polish Notation) mode
- infinite and circular stack
- registers display (stack, 11 memory regs, finance registers)
- display intermediate keystroke and results, status bar
- navigation through history for entry correction and replay (with operation delete, skip, ... options)
- save and reload your calculations to file
- multiple auto-save on exit options
- print
- quick help
- ...
... unmatched features free for ever (no trial period, full version for free)!

Currency calculator with tape - emulation of desktop printing calculator.
Easy and simple, can be operated entirely by keyboard.
Supports copy/paste, undo for last operation

Scientific Calculator is a two-line scientific calculator that provides the look and feel of a real calculator. With a dedicated line for the equation and another for the result, complex equations can be written with ease.
If you dont like the default look, you can change it! Five different skins are provided.
Note: This calculator is only as accurate as the JavaScript runtime environment; floating point rounding errors can occur.
Main features:
- Trigonometry
- Logarithms
- Combinations and permutations
- 7 programmable memory locations
- Pseudo-random number generator