Try this *array* formula in A1:

=SUM(A1000:INDEX(A2:A1000,LARGE(ROW(A2:A1000)*(A2: A1000<""),26)))

--
Array formulas are entered using CSE, <Ctrl <Shift <Enter, instead of the
regular <Enter, which will *automatically* enclose the formula in curly
brackets, which *cannot* be done manually. Also, CSE *must* be used when
revising the formula.

--

HTH,

RD
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Please keep all correspondence within the Group, so all may benefit!
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"gotta know" wrote in message
ps.com...
1. I would like to sum the last 25 days values in a column
automatically once the data are input


example:


a. I want to add the sum of the last 25 values in column A
b. the cell that provides me the figure will be cell A1
c. as soon as the data are entered at the bottom of the worksheet, A1
updates automatically
d. some cells in column A are blank

- How do I keep a running total of the last 25, or any values?

Biff, I rewrote for better explanation.

Thanks in advance,
E