Hi Sebastien

Since you have a changing start and changing end to your range, you would
need a method of telling the formula where both of these values are.
With your formula in B1, set the start row in C1 and the end row in D1
=SUM(INDEX(A:A,C1):INDEX(A:A,D1))

With 5 in C1 and 17 in D1 it would be the same as
=SUM(A5:A17)

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Regards
Roger Govier

"Sebastien" wrote in message
...
Good day,

I am making the sum of a range that varies in length. For example

Cell(1, B) = SUM(A1:A10)

The cells A1 to A10 are a database that is updated daily, and the number
of
rows varies also daily. So one day, the sum could be A1:A7, and the next
day
it is A1:A12. Also, the range sometimes needs to start at A1, sometimes
A3
or A5, it is never the same.

I would need a way to have the last value of my range as a variable
instead
of a fix value.

The final formula should ideally fit in only one cell. I am thinking of
using the count() or the Row() function within my SUM formula but nothing
works.

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Thanks
Sebastien