I've been looking for a Qt5-based calculator with minimal dependencies for sometime.
speedcrunch looked promising, until I saw it pulls
qt5-qttools and its 29 dependencies 😮
Thanks but, no thanks. I don't need
pulseaudio or, ...
clang to run a simple calculator.
Finally I found
lumina-calculator from the lumina-desktop and packaged it. You can find it in the "wip"-repo if you like.