The Windows calculator leaves much to be desired. Fortunately, there are many replacements with excellent features, including AddUp, Auditor Calculator, calcANT, ESBcalc, Moffsoft FreeCalc, and Willy's Freeware Calculator. Each offers a unique blend of extras that make CALC.exe obsolete.

** NOTE: Removed AddUp as it is not free

Windows Calculator Replacements	Auditor Calculator	calcANT	ESBcalc	Moffsoft FreeCalc	Willy's FreeWare calculator
Features
floating decimal display / rounding	yes	yes	yes	no	yes
save tape	no	yes	no	yes	no
print tape	yes	yes	no	yes	no
memory variable	yes	no	yes	yes	yes
visible memory variable	yes	no	no	yes	yes
default / constant memory variable	no	no	no	no	yes
equation entry	no	no	no	no	no
text editor	no	yes	no	no	no
advanced math functions	no	no	yes	no	no
Usability
tray	no	no	yes	yes	no
hotkey	no	no	no	no	no
always / stay on top	yes	yes	no	yes	no
startup	no	no	no	yes	no
undo	yes	yes	no	no	no
find / replace	no	yes	no	no	no
copy / paste tape	yes	yes	yes	yes	yes
copy / paste portions of tape	no	yes	no	yes	no
resize buttons	no	no	no	no	no
resize without increasing font	yes	yes	no	no	yes
select display font size	no	no	yes	no	no
help	no	yes	no	yes	yes