# Sum every nth cell

#### Savvasy

##### New Member
Hi,

I have a spreadsheet with values from D3 up to AB3 and I would like to sum every 4th cell beginning from D3 (D3,H3,L3 etc..).
I've tried a lot of formulas including SUMPRODUCT, MOD, OFFSET but I always get errors and I believe the reason is because all my cells from D3 up to AB3 contain formulas.
Some of the formulas return numbers and some of them return percentages.

Your help would be much appreciated.

### Excel Facts

Why does 9 mean SUM in SUBTOTAL?
It is because Sum is the 9th alphabetically in Average, Count, CountA, Max, Min, Product, StDev.S, StDev.P, Sum, VAR.S, VAR.P.

#### DanteAmor

##### Well-known Member

=SUMPRODUCT((MOD(COLUMN(D3:AB3),4)=0)*(D3:AB3))

#### Joe4

Welcome to the Board!

Whether the values are hard-coded or returned by formulas makes no difference, as long as it is returning numeric values and not text.

Try:
Code:
``=SUMPRODUCT(--(MOD(COLUMN(D3:AB3),4)=0),D3:AB3)``
Note that percentages are really decimals, i.e. 90% actuallt is .90. So that is how those values will be included in your sum.

#### Savvasy

##### New Member
Thank you both for the replies.
Both formulas return a circular reference on cells E3,F3, I3,J3, M3,N3 and so on.
These cells contain a simple formula (for example the formula in cell E3 is =D3/\$C\$54 and the cell properties are set to percentage)

#### Joe4

If you ignore the warning, does it still return the correct value?
What cell are you putting these formulas in?
What is in cell C54?

#### Savvasy

##### New Member
If I delete the formulas in the cells where I get the circular reference then I get the correct value.
I place the formula on C3 and dragging it down until cell C52.
C54 is the sum(C3:C52)

#### Joe4

I place the formula on C3 and dragging it down until cell C52.
C54 is the sum(C3:C52)
If you are placing the formula in cell C3, why is C3 in your sum formula in cell C54?
Since you are using C54 in your calculations in cells D3:AB3, that would, indeed, cause a circular reference. You are indirectly trying to use the value of C3 in the formula in cell C3.
To me, using C3 in your SUM formula does not sound correct.

#### DanteAmor

##### Well-known Member
If I delete the formulas in the cells where I get the circular reference then I get the correct value.
I place the formula on C3 and dragging it down until cell C52.
C54 is the sum(C3:C52)
Your problem with the circular reference is the sum in C54, you are adding cell C3, but C3 is the result of the sum of D3 to AB3. Then in cell E3 you have D3 / C54, but C54 still does not happen, because C3 also adds E3 (although under the conditions of sumproduct, E3 is excluded)

#### Savvasy

##### New Member
D3 and every 4th cell has the sales of an item per month.
The spreadsheet has 50 items so lets say for January I have 50 items with their sales from D3 until D52.
On C3 i put your formula and dragging down until C52 and on C54 i do a sum of total sales of all items for all months
On E3 I would like to get the % of the total sales so this is the reason I am using C3 in my sum formula.

#### DanteAmor

##### Well-known Member
D3 and every 4th cell has the sales of an item per month.
The spreadsheet has 50 items so lets say for January I have 50 items with their sales from D3 until D52.
On C3 i put your formula and dragging down until C52 and on C54 i do a sum of total sales of all items for all months
On E3 I would like to get the % of the total sales so this is the reason I am using C3 in my sum formula.
To avoid circular reference you must add cell by cell:

Cell formula
C3 =sum(D3,H3,L3 etc)