Thank you Inteloide for your work!
There are a few comments on the plugin.
If you enter a value in the calculator and press the button "Insert result in current tab", then the value is inserted into the Notes box and the cursor remains in the value column. You need to insert your cursor after moves to a new line, as it is done with the button "Add current date and time.
When you click "Insert result in current tab" calculator is turned off, is not useful when there is a need to perform calculations, you need to open the calculator.
Propose to add another button in the calculator. The button will turn on/off the ability to log the current note values as a calculator. For example, enter in the Calculator 2 +2 = 4, and this article is written 2 +2 = 4. I think such a feature would be useful.
I apologize if something is not clear, since I use a translator and I know English not well.
Success in everything!
P.s. Why does not update the plugin in the "SketchUcation Plugin Store"