Hi Dave and welcome to the forum!
I totally understand your frustration, and I’m very sorry that we haven’t released the Calculator widget yet. You see, we had to postpone new widgets development for a while due to the urgent task – our whole Dashboard major update.
We’re at the final stage with testing and polishing things up, and when we present our new Dashboard to you, we’ll be happy to get back to making new widgets for you.
Meanwhile, you’re most welcome to vote for this widget request here: Calculator widget.
Please let me know if you have other questions!