How do I add up the last 12 cells (containing values) in a column.

  • Thread starter Thread starter Michelle D
  • Start date Start date
M

Michelle D

I have a table of hours worked by temporary staff which I am constantly
adding new values to. I need to calculate average hours worked from the last
12 weeks they worked at any given moment so I want a total of there hours for
the last 12 weeks.

I have limited knowledge of excel - so at the moment - I add the latest
value - then recalculate the sum of those 12 cells - I would like a table
that automatically calculates the sum of the last 12 cells in a column -
whatever cells they are.

Hope you can help,

Michelle
 
Hi,

Try this

=SUM(OFFSET(A1,COUNTA(A:A)-12,):OFFSET(A1,COUNTA(A:A),))

If there are less than 12 valuse in the range the formula will give an error.

Mike
 
Thank you very much!

Mike H said:
Hi,

Try this

=SUM(OFFSET(A1,COUNTA(A:A)-12,):OFFSET(A1,COUNTA(A:A),))

If there are less than 12 valuse in the range the formula will give an error.

Mike
Click to expand...
 
One way to find the last row and count back.
=SUM(INDIRECT("a"&MATCH(999999,A:A)-11&":a"&MATCH(9999999,A:A)))
 
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