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# Excel Array formula Help

I need  formula that will multiply every value of cells type A by cells type B, in a range, then return the sum of all the results
Results should be: 123*23 + 432*12 +2*10
I need as an array or regular formula and not as a vb.script, purpose is for use to be able to insert rows freely and keep the operation working.

I attach image of expected result
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arana
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1 Solution

EngineerCommented:
Try something like

=SUMPRODUCT(C5:C14*C6:C15)
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Author Commented:
Nice one , that works for example data, but doesnt follow any criteria, if I enter any other value in between it gives wrong result ,  original data has many other rows in between , that is why I specified the A and B types, i am trying something like "  =MMULT(IF(B5:B6="A",C5:C15,1),IF(B5:B15="B",C5:C15,1))"
but cannot make it work.
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Excel & VBA ExpertCommented:
Assuming your data is in the range B5:C13, the you may try the following Array formula...

``````=SUM(IF(B5:B12="A",C5:C12)*IF(B6:B13="B",C6:C13))
``````
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Author Commented:
PERFECT, now can you elaborate in why the second if must start on element below the first one if they are both refering to same data?, I mean c6:c13 contains c12 as well as as most of the first IF data, is it mandatory that the first element of the array matches the condition ?
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Excel & VBA ExpertCommented:
Because the second criteria starts from one row below where the first criteria exists. If you specify the same ranges within the both IF formulas, that will be evaluated as False in all the cases i.e. when B5 is "A", B5 will never be equal to a "B" and if you breakup the formula, you will get a 0 as False * False returns a 0.

Hope you get it. :)
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EngineerCommented:
Nice one , that works for example data, but doesnt follow any criteria,

You can also help by uploading an excel file instead of an image to save some typing.
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Author Commented:
@saqib, you dont need to read my mind, if im explicitly requiring that type A and B should be considered in the results, that means no other data should influence the result.
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EngineerCommented:
Non Array formula

=SUMPRODUCT((B5:B14="A")*C5:C14*C6:C15)
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EngineerCommented:
The criteria followed by the formulas is not

"multiply every value of cells type A by cells type B"

it is

"multiply every value of cells type A by the cells below"
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Author Commented:
No it isn't what you want it to be, it is what I asked  , i need the one i specified, i have type c and type d also, those are not relevant since I'm specifically asking for type A and B, and also that I should be able to add more rows without it breaking things, so see , you don't need to read minds, but you need to read the original question.
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EngineerCommented:
Unless B is on the NEXT line the formula fails. So looking for B is not relevant as you can see on my last formula which works equally.

As soon as b is not on the NEXT line every thing breaks.

Try it.
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