Use the last number in a column

Don't use spread sheets much and wondered if anybody could help with this problem. I am monitoring my weight and each day put the new weight value in the next cell. ie
201
198
197
I have another cell in the sheet which contains my target weight from which I want to subtract the latest weight record this of course moves to the next cell down each day. Is there a formula to pick the last number in a column of data? ie in the above example takes 198 on day 2 but 197 on day 3.
Thanks
Jonathan

Ok. The formula didn't have to be that fancy after all. We can use COUNT to count the number of entries, then use INDEX to return the corresponding entry.
If the actual weights are in column B and goal weight in E2, then in D2 enter this formula:
=E2-INDEX(B,COUNT(B),1)
So, a couple caveats:
1) Must start entering the weights in the top body cell (whether table has header or not, see below).
2) Column B cannot have any extraneous numbers (this will throw the count of entries off).
Free Image Hosting
If you are actually using Numbers '09 and the table has headers, then for some reason the formula is slightly different depending on how many header cells are in column B. E.g. if one header, then enter =INDEX(B,COUNT(B)+1,1); if two headers, then enter =INDEX(B,COUNT(B)+2,1); Or, simply enter =INDEX(B,COUNT(B)+ROW(B)-1,1), which adjusts to whatever number of header cells.
Robin
Message was edited by: sharknca

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