Excel Formula auditing tools

Excel 365 2016 2010 2007 2003
If you would like to better understand how some of these complex array formulas work, consider using a handy tool - Formula Evaluator:

Select the cell that contains the formula, and on the Formulas tab, in the Formula Auditing group, click Evaluate Formula:

Formulas in Excel 2013

The Evaluate Formula dialog box was appeared.

Evaluate Formula in Excel 2013

Click the Evaluate button repeatedly to see the intermediate results as the formula is being calculated.

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How to avoid misleading numbers

How to avoid misleading numbers

Applying a number format to a cell doesn't change the value, but only how the value appears in the worksheet. Formatting can play a joke with you, e.g., sum of values seems incorrect because Excel displays a limited number of decimal places and their sum is not equal to the real sum.
Goal Seeking

Goal Seeking

Goal seeking is a useful feature that works in conjunction with your formulas. If you know what a formula result should be, Excel can tell you which values of one or more input cells you need to produce that result.
Using Solver

Using Solver

Solver tool allows you to specify multiple adjustable cells and constraints on the values that the adjustable cells can have, generate a solution that maximizes or minimizes a particular worksheet cell, generate multiple solutions to a problem.