SUMPRODUCT Divide based on cell reference

[edmam]

Looking for help to figure out how to divide with sumproduct. Based on extensive searching it appears sumproduct is the correct formula. but it is not behaving nicely with blank cells

My end goal is to have the formula calculate the carton count based on the qty and packing. the formula can find this from the order #. sample worksheet attached.

Searched for hours on this forum and greater google and cannot find any answer.

Your help is appreciated!

[bebo021999]

Try with array formula:
=SUM(($E$10:$E$14=A2)*IFERROR($G$10:$G$14/$H$10:$H$14,1))
COnfirmed by Ctrl-shift-enter, not Enter only.

[wk9128]

cell B2 array formula , drag down