How to determine test cases coverage of the web app total functionalities?

Robot Framework
1

Hi has anyone used any tool or RF itself to determine test cases coverage of the web app total functionalities?

Example, I have a web app that has the following functionalities:

  1. login
  2. preferences
  3. bizfunc1
  4. bizfunc2
  5. bizfunc3
  6. logout

If I create 6 Robot test cases, i would have covered 100% of the web app.
If however I created only 5 test cases, i would not have covered all of the web app possible paths.

Is there a lib / tool that I can use to determine this % coverage?

Thanks much.