Moffsoft FreeCalc is a great replacement for your existing Windows calculator. We took the standard Windows calculator functionality and added the following features:

Adjustable calculator size - Make it any size you want and Moffsoft FreeCalc will remember the size and position next time you use it. (see example)  
Tape - Save, print, or clear the simulated paper history tape.
Color schemes - Select a color combination or use your Windows color settings.  (see example)
New keys - Clear Tape {CT}, double zero {00}, triple zero {000}, and memory subtract {M-} keys have been added.
Visible memory value - You'll always know what's in memory because it's displayed on the calculator status bar.
Option settings - Flat buttons, always on top, tray icon, run on startup, and hiding the tape are some of the calculator options.  (see example)
Digit groupings - Number groupings for easy to read numbers.
International support - Digit grouping and decimal point characters change based on your regional settings.  (see example)
Tray icon - Turn on the tray icon for quick and easy access.  (see example)
System requirements - Windows 95/98/Me/NT/2000/XP/Vista/7

 

 

 

 

info from:

http://www.moffsoft.com/freecalc.htm