sum dynamic rows?

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I have dates (days) in column B and numbers in column H. I wanted to have column I look at column B and if it is a Friday, to sum the last seven H cells and multiply by 15.

I thought the following formula would work but it does not… what am I doing wrong please?

=IF(WEEKDAY(B14)6,””,sum(“H”&row()-7:H14)*15)

(This shows the formula in cell I14; so if B14 is a Friday, it should sum H7:H14 then multiply by 15; if B14 is not a Friday, I14 remains blank)

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In I7 (the first row where you could possibly add 7 rows):

=IF(WEEKDAY(B7)6,””,SUM(H1:H7))

and fill down as far as needed. The B7 and H1:H7 in the formula will automatically be adjusted.

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Thanks Hans, I did think of that but was hoping there was some way to use the ROW() method. I have seen this used in VBA – especially in loops where something like “M”&row(i) is used. Is this restricted to VBA or can it be used in a formula? Not the row(i) but the Row() plus or minus some number.

In I7 (the first row where you could possibly add 7 rows):

=IF(WEEKDAY(B7)6,””,SUM(H1:H7))

and fill down as far as needed. The B7 and H1:H7 in the formula will automatically be adjusted.

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I don’t see the need for that here, but if you wish, you can use the ROW() function in combination with the INDIRECT function.

For I7:

=IF(WEEKDAY(B7)6,””,SUM(INDIRECT(“H”&(ROW()-6)&”:H”&ROW())))

Yet another possibility is to use the OFFSET function:

=IF(WEEKDAY(B7)6,””,SUM(OFFSET(H7,-6,0,7,1)))

OFFSET(H7,-6,0,7,1) means: go 6 rows up from H7 and extend to a height of 7 rows.

Both formulas will have the same result as the one from my first reply, but they are more complicated.

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