Excel Formula To Show Top X Percentage Of An Array

The solution is pretty straightforward. It requires the SMALL() function:

Worksheet Screenshot

Enter the following formula in D2:

=SMALL(B2:B11,ROWS(B2:B11)*0.8)

Note that the LARGE() function could also be used but it is not as elegant:

=LARGE(B2:B11,ROWS(B2:B11)*(1-0.8)+1)