Respect a Filter with Sumproduct

Quite often Sumproduct is used in cases where a Pivot table just doesnt cut it. Here's how to make Sumproduct respect filters in a data table. 

Pick a column in your datatable 


Lets use the ID column, and make a name range - In this case Im using a data table, but you could equally use a dynamic range.

limiter = dataTable[ID]

Use Subtotal

We are going to leverage the subtotal function , since it respects the rows filtered out in a table, and we can intercept that to create a series of 1/0 to indicate whether the row is filtered or not. To make this very clean , we can create another named range

respectFilter =(SUBTOTAL(102, OFFSET(limiter,ROW(limiter)-MIN(ROW(limiter)),,1,1)))

That gives us this result



Filter the Table


You can see that the formula respects any filtering done on the table. 

How does that work?

Evaluating the formula shows that the Subtotal() function associated with the respectFilter named range  returns a series of 1/0 depending on whether the row is filtered out. It is this behavior that eliminates the hidden rows from the sum.


Break it down

=sumproduct(SUBTOTAL(102, OFFSET(limiter,ROW(limiter)-MIN(ROW(limiter)),,1,1))))

  • 102 instructs subtotal to do a COUNTA() function - so when the rows are counted one at a time, the result is either 1 or 0. 
  • Offset (,,1,1) means to look at the range 1 at a time
  • row(limiter)-min(row(limiter)) calculates the current cell by subtracting the first row of the limiter range from the current row
  • An array of size rows(limiter) is created with the result of a series of counta() single cells, which equate to 0/1
  • This array is intercepted by sumproduct and applied to its other arguments

Summary

This is a neat way to make Sumproduct respect filters applied to its target. Putting the whole thing in a named range like sumproduct(respectFilter) keeps your worksheet clear of clutter. For more tips like this see Get Started Snippets. 
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