With the cell of reference being C1, try this:

=SUM(A1:INDEX(A:A,C1))

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HTH,

RD
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Please keep all correspondence within the Group, so all may benefit!
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"Massimo" wrote in message
...
Hi all,

I need to sum some consecutive cells in a row, depending on a number in
another cell.

For instance:
If the cell contains 2 sum A1 + B1
If the cell contains 3 sum A1 + B1 + C1
If the cell contains 4 sum A1 + B1 + C1 + D1
and so on ...

is there a function to do that or vba code needs to be written?

any help will be very much appreciated.

Thanks!
Massimo