Sum Per Month

Experts,

How can I sum the attached per month?

thank you
screenprintSum-Per-Month.xlsx
pdvsaProject financeAsked:
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Rgonzo1971Connect With a Mentor Commented:
Hi,

pls try
=SUMPRODUCT(--(DATE(YEAR($B$3:$KV$3),MONTH($B3:$KV$3),1)=B1),$B$4:$KV$4)

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Regards
Sum-Per-MonthV1.xlsx
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ProfessorJimJamCommented:
put this and drag right

=SUMPRODUCT((MONTH($B$3:$KV$3)=MONTH(B$1))*($B$4:$KV$4))

see attached.
Sum-Per-Month.xlsx
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ProfessorJimJamCommented:
correction to my formula above

=SUMPRODUCT((MONTH($B$3:$KV$3)=MONTH(B$1))*((YEAR($B$3:$KV$3)=YEAR(B$1))*($B$4:$KV$4)))
Sum-Per-Month.xlsx
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pdvsaProject financeAuthor Commented:
Thank you.  Rgonzo's accounted for the years which is what I was after.  August 2016 and August 2017 were the same answer under Professor's.  I might have not made that so clear though.
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ProfessorJimJamCommented:
glad Rgonzo's solution worked for you. i did not notice at first glace your data had multiple years, so i posted a modified formula which is =SUMPRODUCT((MONTH($B$3:$KV$3)=MONTH(B$1))*((YEAR($B$3:$KV$3)=YEAR(B$1))*($B$4:$KV$4))) which works too.
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pdvsaProject financeAuthor Commented:
Thank you for your follow up.  Much appreciated
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ProfessorJimJamCommented:
you are welcome.
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