sum last 12 values

wasntme

New Member
Joined
Feb 1, 2019
Messages
37
Hello,

I have a spreadsheet in which is added data in 2 columns each month at the end of the sheet, called "NET" and "VAT". I am trying to write a formula that sums entries from last 12 columns "NET" (one formula for last 12 "NET" columns, f.e AK, AI, AG, AE etc) and "VAT" (another formula for last 12 "VAT" columns, f.e AL, AJ, AH, AF etc) (yearly review) no matter how many they are.

I am using for similar purpose (summing last 12 entries, but here is added just one column monthly) this formula:
Code:
=ROUND(SUM(INDEX(I15:ZT15,MATCH(9^9,I$12:ZT$12)-11):ZT15),2)

but do not understand it well enough to rework it for my needs.

Any help is greatly appreciated.
 

Excel Facts

Did you know Excel offers Filter by Selection?
Add the AutoFilter icon to the Quick Access Toolbar. Select a cell containing Apple, click AutoFilter, and you will get all rows with Apple
Any help is greatly appreciated.
If I understand you try this formulas below

In 'A3' cell, helper formula (Related to the range in Row 12, return the start column from which the sum starts)
Code:
=CHAR(64+(MAX(COLUMN(I15:ZT15)*(I15:ZT15<>""))-24)+1)&(ROW(A15)-3)
In 'B3' cell, helper formula (Related to the range in Row 15, return the start column from which the sum starts.)
Code:
=CHAR(64+(MAX(COLUMN(I15:ZT15)*(I15:ZT15<>""))-24)+1)&ROW(A15)
In 'D3' cell, SUM formula for last 12 Cells based on 'COL' header (copy across)
Code:
=SUM(IF(INDIRECT($A$3&":ZT12")=D$2;INDIRECT($B$3&":ZT15");0))
I hope it helped.

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[TD]A[/TD]
[TD]B[/TD]
[TD]C[/TD]
[TD]D[/TD]
[TD]E[/TD]
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[TD]Title[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
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[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
[TD]NET[/TD]
[TD]VAT[/TD]
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[/TR]
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[EDIT]:
I apologize, I forgot to mention that all ARRAY formulas.
 
Last edited:
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