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# Excel/SUM numbers in a consequtive time period

Question

pivot
Hello,

I have a pivot table that displays total volumes of requests for each month for each floor of a building. I've included an image of the first few sections for reference. I need a way highlight values over a three month period that sum to greater then 10.  I was going to just do a quarterly SUM but that doesn't address three month periods that span two quarters.  Do you have a suggestion of what formula I can use to look at any three consecutive months and compare the SUM value?  I can either just do this via conditional formating (if the formula will work there) or I can put this formula outside the pivot table if necessary.

Hopefully that makes sense!  Thanks for the help/direction.

On a blank sheet, enter in range C1:N1 the labels JAN, FEB, MAR, ... etc

In range C2:N3, enter the volumes that we'll use for this sample. Select C2:N3 and click Conditional Formatting, New Rule, Use a formula to determine which cells to format, Format values where this formula is true: =MAX(SUM(A2:C2),SUM(B2:D2),SUM(C2:E2))>10, Format, fill, [red], OK, OK.

Now, in each row of your volumes, any cell which is part of a 3-month period with volumes over 10 will get shaded red.

Now that you understand how the principle works, you should be able to apply this method to the specifics of your own worksheet.
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#### Stuart Resnick

##### Expertise

I can answer questions relating to MS Excel formulas, or to programming with vba (Visual Basic for Applications) in the Excel environment. Please follow the following guidelines: your question should focus on one specific issue you want to learn. It's beyond the scope of this free service for me to create entire projects or complex vba solutions for you from scratch. You should be able to do most of the work yourself, and come here when you need help with a specific point you're stuck on. ALWAYS include a simple, concrete example illustrating what you want to learn. Explain this example in detail in the text of your question (what data is in which cells of which sheets, etc). Be very precise about the results you want, using this sample to make the logic clear. Always keep these examples SIMPLE. Never e.g. use 18 worksheets in your example if using 2 or 3 will do. Never use ranges like AI567:BB865 if using a range like A1:B3 will do. Thanks.

##### Experience

As a consultant, I've designed Excel tools since the 90s, working for the Federal Reserve Bank, AT&T, and (currently) Gap Inc.

Education/Credentials
My only "education" comes from 2 decades of doing spreadsheet/programming work, with major SF Bay Area corporations such as AT&T, Federal Reserve Bank, and Gap Inc.