I want to sum 3 columns of every other row in Excel.

I know how to do the "sum every 3 columns" part:


How do I apply this formula so it sums every other row, starting with A40 ?

So A40, A42, A43 etc.


Basically, if you look at this picture, I am looking for formula, that would allow to sum every red cell in N3 and then be copy-pasted to sum every yellow cell in O3.

enter image description here

  • 1
    Do you want your formula to sum every other row?
    – yass
    Mar 23 '17 at 21:08
  • sorry, looks like I didn't quite explain myself, I will update
    – stpn
    Mar 24 '17 at 1:35
  • By looking at the example (picture),You may need to sum the yellows ones in N3 and the red ones to O3
    – yass
    Mar 24 '17 at 9:10
  • @stpn are you allowed to add an extra column?
    – Salman A
    Mar 24 '17 at 10:25
  • Your N's and M's are incorrect. What you want is to sum every Row or every other row or Rows/2, but columns to X or 3 in your example.
    – ejbytes
    Mar 25 '17 at 0:46

You can use the following, if the column you need to sum are consecutive (A,B,C) In O3 write:


Press Ctrl + Shift + Enter (Array Formula)

This formula divide the row number by 2 if the result is 1 (the remain ) (Mod(Row(),2)=1) it will add the value of the corresponding cell in the columns(A,B,C) to the sum if the remain is 0 it will return ""

In N3 you can just change the rferences:


Change the references to correspond your real Data


Using Array Formulae:

Copy and paste the formula below. After you've pasted this, rather than just hitting enter, press CTRL+SHIFT+ENTER


enter image description here


MOD or Modulus, is looking at every 2nd Row, so your yellow row must correspond to EVEN row numbers, regardless of what your region is.

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