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

Author Sun Last modified

In statistical calculations, the weighted average is more widely used 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.
A screenshot of grades and case counts with blank cells in Excel

Calculate weighted average while ignoring 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:
A screenshot of calculating weighted average while ignoring blank cells in Excel

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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