1. Add the fields that you'd like the calculation to be based from. This can either be from a single or multi-line field or a drop-down select field. In the example below, I set up common fields (Rent, Utilities, Bills) that I know someone would only enter numbers in. 

2. Then under the Specialty Tools sections, drag and drop the Calculations field. Once you've done this, select the gear icon on the right of the field, this will take you the field's settings. Here you can set up your calculation in the Enter formula here field. You'll be able to add your necessary fields and set up the equation to get the needed total. 

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