Over the past few years I acquired a bad habit of using search engines for basic calculations and conversions. I’m not talking about the stuff you should just do in your head — not quite that bad, but about the fact that most Linux distros don’t seem to ship with a calculator by default. So I finally got around to testing some programs and Qalculate! does all I want. You can install it on Debian using
sudo apt install qalculate-gtk. There’s a list of features on the website. Enjoy a few screenshots.
I hope you’ll like it too!