The sheet name range G1:G17 should not be blank or invalid. Try with 3 valid
sheetnames with the below formula
=SUMPRODUCT(COUNTIF(INDIRECT("'" & G1:G3 & "'!A2:A2000"),A3))

Biff thanks; I noticed this but just worked on OP's formula...(my laziness)

If this post helps click Yes
---------------
Jacob Skaria


"AussieBec" wrote:

If I just type the sheet name as per the tab into G1:G17 I get a #ref error
I paste the formula into column c, to give me a result from col a.

Thanks for assistance.


"Jacob Skaria" wrote:

With your sheetnames in range G1:G17 try the below formula

=SUMPRODUCT(COUNTIF(INDIRECT("'" & G1:G17 & "'!$A$2:$A$2000"),A3))

If this post helps click Yes
---------------
Jacob Skaria


"AussieBec" wrote:

=SUMPRODUCT(--(A3=ALB!$A$2:$A$2000))

I have the above formula over 1000 lines which I need to sort the result
ascending/descending of those 1000 lines some point to different worksheets
so when I sort they no longer point to the correct worksheet. How do I use a
sumproduct to reference all worksheets (up to 17 worksheets) incidently all
will have the same range A2:A2000 just different worksheet name.

ALB.UNKN (worksheet alb)
BAT (worksheet bat)
BAT.001 (worksheet bat)
BLA (worksheet bla)
BLA.001 (worksheet bla)
CRE (worksheet cre)
CRE.001 (worksheet cre)

I'm sure they will be a solution quicker than I typed this request.
Thanks
Bec