These fields are used to show the results of the calculator or display various types of content. You'll need a Formula field to show a calculation. If you also want to save the results make sure to add a Button field also.
Calculate something and show the result
Submit the calculator and/or send the user to another page
Show a text or even HTML content (including third party widgets like videos, calendars, etc) inside the calculator
Show an image inside the calculator
Show a dynamic chart inside the calculator
Group together multiple calculator fields and show them in one or more columns
If you need a multi-step calculator, place the Step Separator where you need the next step to start