Need formula or Function to sum value of every other cell in a col

[Brent]

Hello,

I have a need to sum the values in every other cell, and sometimes every
third cell, in a column or row.

Thanks
--
Brent

[Bob Phillips]

=SUMPRODUCT(--(MOD(ROW(A1:A20),2)=1),A1:A20)

gets A1,A3, etc.

To get A2,A4, etc. then change =1 to =0.

For every third, do a MOD(...,3)

etc.

--

HTH

RP

"Brent" <[email protected]> wrote in message
news:[email protected]...
> Hello,
>
> I have a need to sum the values in every other cell, and sometimes every
> third cell, in a column or row.
>
> Thanks
> --
> Brent

[David Billigmeier]

Gonna have to modify this a little, depending on how your data is set up.
This formula assumes your data range is A1:A20, and the number of rows in
between that you want to skip in the sum is located in B1.

=SUMPRODUCT((MOD(ROW(A1:A20),B1)=0)*(A1:A20))

So, if you had 2 located in B1, this formula will give you a sum of
A2+A4+A6+...+A20.

If you have a 3 located in B1, this formula will give you a sum of
A3+A6+A9+...+A18.

--
Regards,
Dave


"Brent" wrote:

> Hello,
>
> I have a need to sum the values in every other cell, and sometimes every
> third cell, in a column or row.
>
> Thanks
> --
> Brent