Evaluating Formulas

Often it is frustrating to figure out exactly how Excel arrives at a particular result—particularly if the formula returning the result is quite complex. Fortunately, Excel provides a tool you can use to help figure out what is going on when Excel evaluates a formula. To access this tool, follow these steps if you are using Excel 2002 or Excel 2003:

1. Select the cell containing the formula you want to evaluate.
2. Choose Formula Auditing from the Tools menu. Excel displays a submenu.
3. Form the submenu choose Evaluate Formula. Excel displays the Evaluate Formula dialog box.

If you are using Excel 2007, then display the Formulas tab of the ribbon. In the Formula Auditing group click the Evaluate Formula tool. Excel displays the Evaluate Formula dialog box. (Click here to see a related figure.)

At this point, Excel shows the full formula from the cell, and part of it is underlined. This underlined area represents the part of the formula that Excel will next evaluate. This allows you to see what intermediate steps Excel follows in arriving at a result. Every time you click the Evaluate button, Excel replaces the underlined portion of the formula with a result.

Nothing you do with the formula evaluator actually affects the formula in your worksheet; it remains unchanged. Instead, Excel simply shows you what happens as it works through each part of the formula to arrive at a result. When you are done using the formula evaluator, click the Close button.