In the example shown the formula in D4 is: As this formula is copied down column D, it changes as follows: At each new row, the range is expanded to include one new row. As a result, the SUM function calculates an accurate running total. Author

Dave Bruns

Hi - I’m Dave Bruns, and I run Exceljet with my wife, Lisa. Our goal is to help you work faster in Excel. We create short videos, and clear examples of formulas, functions, pivot tables, conditional formatting, and charts.