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. 

Note: If using a Drop Down menu the option need to be numerical values to be used in calculations. They cannot have any text labels with each option, see example below:

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 side 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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