3 month rolling totals

[DTTODGG]

Hello,

I just typed this in and the message didn't take - I hope this is not
duplicated.

I have inherited a spreadsheet with 3 month rolling totals. Is there a way
to automate this?

Sample:
Widget(A1) Jan(B1) Feb(C1) Mar(D1) TOTAL(E1)
Where TOTAL = sum(b1:d1)

Next month, we add Apr(E1) moves TOTAL to (F1) and doesn't compute Jan(B1)
Where TOTAL = sum(c1:e1)

There are many rows with this type of data and so I would rather not
copy/paste/reformat the formula.

Thanks in advance!

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[Paul C]

Try something like this
A B C D E
1 Jan Feb Mar Apr Tot
2 1 2 3 4 9

The formula for E2 is =SUM(OFFSET(E2,0,-3,1,3))

This defines a range 1 row and three columns wide that always starts 3
columns to the left of the cell with the formula, so when you add a column
(like May) the total formula still references the correct 3 cells.

 

[DTTODGG]

Thank you Paul ... simple and beautiful!

Try something like this
A B C D E
1 Jan Feb Mar Apr Tot
2 1 2 3 4 9

The formula for E2 is =SUM(OFFSET(E2,0,-3,1,3))

This defines a range 1 row and three columns wide that always starts 3
columns to the left of the cell with the formula, so when you add a column
(like May) the total formula still references the correct 3 cells.