I have a calculator button on my keyboard right above the ten-key. When I push it it opens my calculator app or brings it to foreground if it's already open. I

I have a calculator button on my keyboard right above the ten-key. When I push it it opens my calculator app or brings it to foreground if it's already open. I consider it extremely convenient since I find I need a calculator often, but not often enough to justify leaving one always on my desk. Also I can copy and paste answers/intermediary results easily and it does conversions automagically (e.g. "5 cups in ounces").