Try this

=SUM(INDIRECT("A"&ROW()&":A"&C1))

--

HTH

RP
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"Jeff" wrote in message
...
Hi,

I have a formula that sums the range

Cell B1 = Sum(A1:$A$100)
and this is copied down to cell B100,
so Cell B33 = Sum(A33:$A$100)

But I want the sum range to change, based on the value in cell C1.

If C1 = 100, then the sum range will = Sum(A1:$A$100),
Cell B33 = Sum(A33:$A$100)

If Cell C1 = 300, then the sum range will = Sum(A1:$A$300)
Cell B33 = Sum(A33:$A$300)

I tried using indirect but I could not figure it out.

Thanks for your help