How to Add a Formula Field in a Salesforce Report

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Here’s a step-by-step guide to adding a formula field in a Salesforce report:

1. Navigate to the Reports tab and select the report you want to add the formula field to.
2. In the existing Report, click on the Edit button on the top-right to enter the Edit mode. 
3. Turn the chart toggle OFF if it’s ON (Pie icon on the top-right)
4. Navigate to the far left of the screen to find an inward arrow left of the Outline header, called Show Fields.
5. Click on Create Formula under the Summery Formula folder.
6. In the Window that opens, provide a column name where your filter will generate the output. Also, define the Formula Output Type. 
7. In the formula editor, you can select fields from the available list on the left. These are the fields from the chosen report type that you can reference in your formula.
8. Use mathematical operators (e.g., +, -, *, /) and Salesforce formula functions (e.g., TEXT, DATE, VLOOKUP) to construct your formula. Click on the desired functions or operators to insert them into the formula editor.
9. Save the formula field.‍
10. Save and Run the report.