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How to ignore blanks when calculate the weighted average in Excel?

In statistic calculation, the weighted average is used more widely than the average function. But do you know how to calculate the weighted average ignoring the blanks in Excel?

For example, there are two columns in a sheet which record the grades and the number of cases of a student, but this student is absent from some cases of examinations which leave the blanks in the column of grades as below screenshot shown. If you apply the normal Weighted Average function =SUMPRODUCT(A2:A5,B2:B5)/SUM(B2:B5), it will get the result 79.333 which is somewhat unfair for the student. In this article, I introduce a formula to calculate the weighted average ignoring blank records in Excel.
doc weighted average ignore zero 1

Calculate weighted ignore blanks

arrow blue right bubble Calculate weighted ignore blanks

Select a blank cell you want to place the result, and type this formula =SUMPRODUCT(A2:A5,$B$2:$B$5)/SUMPRODUCT(--(A2:A5<>""),$B$2:$B$5), and press Enter key. See screenshot:
doc weighted average ignore zero 2

In the formula, A2:A5 is the grade records, B2:B5 is the number of cases. You can change them as you need.

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Thank you, the article helped me a lot!
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