Help:Highlight if top 80% cumulative percentage of a product has less than 3 customers

No... CF is Conditional formatting.

On my sheet... with the cursor set anywhere in your data range, if you go to Home/Conditional Formatting/Manage Rules/Edit you will see the formula in place.

What you need to do is to change the ranges to something sensible and appropriate to your dataset.

=COUNTIFS($A$3:$A$20000,$A3,$E$3:$E$20000,"<.8")<3

Here (above) it is changed to look at 20,000 rows. I have changed it to 20,000 in the attached sheet. Unless you have close to 1,000,000 rows, do not use:

=COUNTIFS($A:$A,$A3,$E:$E,"<.8")<3

which will look down all 1,000,000+ rows, will increase file size and may impact on performance.

To calculate col E automatically, use:

=SUMIF($A$3:A3,A3,$C$3:C3)/SUMIF(A:A,A3,C:C).

You're welcome.

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