How to Calculate a Weighted Percentage in Google Sheets


You can use the following formula to calculate a weighted percentage in Google Sheets:

=SUMPRODUCT(A:A, B:B)/SUM(B:B)

This formula assumes column A contains the percentage values and column B contains the weights.

The following example shows how to use this formula in practice.

Example: Weighted Percentage in Google Sheets

Suppose we have the following dataset that shows the scores that some student received on various exams along with the weights for each exam:

We can use the following formula to calculate a weighted percentage for their final grade in the class:

=SUMPRODUCT(B2:B6, C2:C6)/SUM(C2:C6)

The following screenshot shows how to use this formula:

weighted percentage in Google Sheets

Click the Format as percent button to convert this decimal to a percentage:

The value will automatically be formatted as a percentage:

The final grade turns out to be 85%.

We can verify that this is correct by manually calculating the weighted percentage of grades:

  • Weighted Percentage: (90%*10%) + (91%*10%) + (81%*10%) + (78%*10%) + (85%*60%)
  • Weighted Percentage: 9% + 9.1% + 8.1% + 7.8% + 51%
  • Weighted Percentage = 85%.

This weighted percentage matches the value that we calculated using the formula from earlier.

Note: You can find the complete documentation for the SUMPRODUCT function in Google Sheets here.

Additional Resources

The following tutorials explain how to perform other common tasks in Google Sheets:

How to Calculate Frequencies in Google Sheets
How to Calculate Cumulative Percentage in Google Sheets

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