Simplicity rules 'em all. I'm pretty sure someone has done this by now, so if someone did it, I apologize. Usage is simple. just type anywhere "/calc YOUR OPERATION" supports 4 basic operations (+-/). Eg " /calc (4+5)5/3". And so on :]
alias calc {
if ($1- != $null) {
echo -a [/Calc] > Calculating :4 $1-
echo -a [/Calc] > Result is :4 $calc($1-)
}
else echo -a [/Calc] : No parameters given. Halting.
}