How to create the keyboard shortcut for Windows Calculator:
NOTE: This is a user setting, so it will need to be created for each user on each machine.
Right click on the Windows icon in the bottom left corner of your screen.
Select File Explorer
In the location bar at the top, enter "shell:AppsFolder" and press <Enter>
Once the apps icons show, right click on the Calculator icon and select create shortcut.
You will probably get a warning "Windows can't create a shortcut here. Do you want the shortcut to be placed on the desktop instead?" Answer "Yes".
Right-click on your new Calculator shortcut on Desktop
Select "Properties" and click on the "Shortcut key" field/entry
Select "c" while holding down both the <Ctrl> and <Shift> keys
How to use the keyboard shortcut for Windows Calculator:
Select "c" while holding down both the <Ctrl> and <Shift> keys