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Two-way summary count with COUNTIFS

Excel formula: Two-way summary count with COUNTIFS
Generic formula 
=COUNTIFS(rng1,crit1,rng2,crit2)
Explanation 

To build a two-way summary count (i.e. summarizing by rows and columns) you can use the COUNTIFS function.

In the example shown, the formula in G5 is:

=COUNTIFS(dept,$F5,class,G$4)

How this formula works

The COUNTIFS function is designed to count things based on more than one criteria. In this case, the trick is to build a summary table first that contains one set of criteria in the left-most column, and a second set of criteria as column headings.

Then, inside COUNTIFS function, range1 is the named range "dept" (C5:C11) and the criteria comes from column F, input as the mixed reference $F5 (to lock the column). Range2 is the named range "class" (D5:D11) and the criteria comes from row 4, input as the mixed reference G$4 (to lock the row):

 =COUNTIFS(dept,$F5,class,G$4)

When this formula is copied through the table the mixed references change so that COUNTIFS will generate a count as the intersection of each "pair" of intersecting criteria.

Author 
Dave Bruns

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This is probably the best explanation I've ever read of an excel function, and I've read a lot! Thank you for making it so clear and easy to understand!!! :) - Marie
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