Excel automatically adds up numbers in PivotTable reports using SUM, which is called, naturally enough, a summary function. You can use other summary functions to calculate the numbers in different ways: for example, to get the average, or to count things up.
Or you can show values as a percentage of the total, or create a running total, by using a custom calculation. And you can create your own formulas in PivotTable reports.
Learn how to work with numbers in PivotTable reports in this brief course.
To learn more about this course, read the text in Goals and About this course, or look at the table of contents. Then click Next to start the first lesson.