Hey, I have to tell you that you chose a pretty unlucky name for your app. There’s already the very awesome Qalculate! out there. Look it up. I can only recommend it, since it’s beyond the best I even thought I would find.

I know it feels a bit bad when you find, that someone had the same idea earlier, and was way better at it. But hey, it’s open source and it needs KDE4 compatibility right now. So you could join in and hopefully even take an important role in its development! In other words: You can still make it your child too. :)