Goal Seek in Microsoft Excel
Provided by: FMS Development Team
Goal Seek is a feature in Microsoft Excel that will determine a value for
you, based on a desired goal. Goal seek works using at least 2 fields, one
of which is a calculation.
For example, suppose that you wanted to know what value is 25% of 125. A
percent is always the part divided by the whole, of which we know the two
latter pieces, but need to now determine the former piece of information.
To create this example in Excel, create a new worksheet, and across the
first three columns, put the following text to make headers:
A1: Part
B1: Whole
C1: Percent
Given that you know the Whole value, 125, enter it into cell B2.
In cell C2, put the following formula, which will calculate the percent:
=A2/B2
Now you are ready to Goal Seek. Click into cell C2, and from the Main Menu
choose Tools / Goal Seek. This will open the Goal Seek dialog box, which has
the following three parameters:
 Set Cell: A calculation cell in which the Goal is attributed.
 To Value: The value in which the Set Cell should result.
 By Changing Cell: The value to be changed to make it such that the Set Cell
results in the target value.
In this example, the 'Set Cell' is the percent field, thus C2 would be its
entry. The 'To Value' is .25, which is the 25%. The 'By changing cell' would
be A2, as we want to determine the Part field.
Click Ok on the dialog box and the Goal seek performs the math necessary to
determine the value. After Goal Seek completes, it should change A2 to 31.25
as 31.25 / 125 = 25%
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