You could use sumproduct to add the appropriate cells and to the count the
appropriate cells, then just divide the two:
=sumproduct(--(z1:z5000=b11),--(ca1:ca50000),(ca1:ca5000)) /
sumproduct(--(z1:z5000=b11),--(ca1:ca50000))
--Bruce

"ellebelle" wrote:

I want to get the average with two criteria. if the cells in column Z = B11
then I want the average value from column CA (BUT I only want the average of
cells greater than zero.)