Difference between last two cells with offset functionality

cazfromoz

New Member
Joined
Nov 8, 2011
Messages
48
Office Version
  1. 365
Platform
  1. Windows
Hello everyone,
In the variance column I would like a dynamic formula that finds the difference between the current month for example Nov 21 and the difference between the previous month Oct 21. I have been manually inputting =g4-f4 and dragging the formula down for the variance column each month. I have tinkered with an offset formula - =(OFFSET($B$17,0,COUNT(C17:N17),1,-2)) but I don't know how to include the subtraction component. Works perfectly if I wanted to SUM the cells, but I need to find the difference.
Thank you.
Invoice DescriptionJul-21Aug-21Sep-21Oct-21Nov-21Dec-21Jan-22Feb-22Mar-22Apr-22May-22Jun-22Variance
0 - 3 months old
10​
10​
12​
6​
8​
2
3 - 6 months old
7​
7​
7​
9​
7​
(2)
6 - 12 months old
3​
5​
6​
9​
11​
2
Over 12 months old
22​
22​
21​
22​
22​
-
Total Invoices
42​
44​
46​
46​
48​
0​
0​
0​
0​
0​
0​
0​
2
 

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Given that OFFSET is a volatile function I would avoid it where possible.

Could this be any use?

21 12 08.xlsm
ABCDEFGHIJKLMN
1Invoice DescriptionJul-21Aug-21Sep-21Oct-21Nov-21Dec-21Jan-22Feb-22Mar-22Apr-22May-22Jun-22Variance
20 - 3 months old101012682
33 - 6 months old77797-2
46 - 12 months old3569112
5Over 12 months old22222122220
6Total Invoices424446464800000002
Diff
Cell Formulas
RangeFormula
N2:N5N2=LOOKUP(9^9,B2:M2)-LOOKUP(9^9,B2:M2,A2:L2)
B6:N6B6=SUM(B2:B5)


An alternative for N2 would be
Excel Formula:
=LET(r,B2:M2,n,COUNT(r),INDEX(r,n)-INDEX(r,n-1))
 
Last edited:
Upvote 0
Solution
Hello Peter
Seriously, I have no idea what the lookup with the 9^9 means, but it worked perfectly. My next homework is to Google the 9^9 part.
This fabulously great Excel community never ceases to amaze me.
A big thank you.
Caz from OZ
 
Upvote 0
You're welcome. :)

I have no idea what the lookup with the 9^9 means
It is just a big number. It the lookup cannot find anything that big it returns the last number in the range
 
Upvote 0

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