Changing PivotTable Calculations
By default, Excel populates the Values area of your PivotTable by applying the SUM function to any numeric field you put there or by applying the COUNT function to any nonnumeric field. But you can choose from many alternative forms of calculation, and you can add your own calculated fields to the table.
Using a Different Summary Function
To switch to a different summary function, right-click any cell in the Values area of your PivotTable, and then click Value Field Settings. (Alternatively, click the Options tab under PivotTable Tools, and then click Field Settings in the Active Field group.) Excel displays the Value Field Settings dialog box, shown in Figure 15-13. Select the function you want from the Summarize ...