# Posts by sajo

• ## SUMIF using Variable Columns

Re: SUMIF using Variable Columns

Off by 1 error

Just add -1 after the \$O\$12 reference:
=SUM(\$O20:INDEX(\$O20:\$S20,MATCH(\$O\$12-1,\$O\$19:\$S\$19)))

Worked!! Thanks a million!

• ## SUMIF using Variable Columns

Re: SUMIF using Variable Columns

Thank you. This formula is not allowing the revision of the sum range when I change the month in O12.

i.e
If I change the month to Mar-15 I need to sum cells O20:P20.
If I change the month to May-15 the sum range will change to O20:R20.

I am looking to sum the cells that fall BEFORE the month chosen in O12.

• ## SUMIF using Variable Columns

Hoping someone can help because I've been trying to figure this out for days!

I am looking to sum the cells only up to the column of the selected month: O12.
O12 is a drop down of all 12 months.

In the example below, the selected month is Apr-15 so in cell AZ20 I will need the sum of O20:Q20, columns prior to Apr-15.
If the month changes to May-15, I will need the sum of O20:R20 to sum in cell AZ20.