Next: Pin it

1. Click on the extensions icon.

2. Find "Floating Calculator" in the list of extensions.

3. Click on the pin icon on the right of this extension's icon.

I don't see the calculator

The calculator should float on most webpages except:

1. The chrome webstore page - https://chrome.google.com/webstore

2. Browser pages like the new tab, settings pagae or individual extensions pages

3. If an organizational policy blocks modifying a page.

All done.