Calculated Items allow you to create formulas based on arithmetic operations between elements in rows and/or columns within a pivot table. Sometimes Excel can get confused and display incorrect results due to a misinterpretation of the order of computational operations. Solve order is an option with which we can change the order to get the correct result.
Before we create a Pivot table, it is important that we have a well-defined data source. Columns of the table represent the reporting dimensions (dimensions and measures) and before we begin to make the report it would be useful to prepare well all the reporting dimensions. However, it is sometimes necessary to add some new dimension “on the go” and it is therefore useful to know how to use the Calculated Fields and Calculated Items features.