[Slick]

Let's put it this way. I normally have the windohs calculator up when I'm playing. I don't us it that frequently, but it's nice to alt-tab to bring up the calculator to quickly crunch some numbers.

I'd say that "calculation" is coming up with an exact number, not an estimate. Some people can do such things in their heads; guys like me who are nursing his last semi-functioning brain cell use a calculator.