Weighted average in Excel

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This tutorial shows how to work Weighted average in Excel using the example below;

Formula

=SUMPRODUCT(numbers,weights)/SUM(weights)

Explanation

To calculated a weighted average, you can use the SUMPRODUCT function together with the SUM function. In the example shown, the formula in G7 is:

=SUMPRODUCT(C5:C11,D5:D11)/SUM(D5:D11)

How this formula works

The SUMPRODUCT function multiples arrays together and sums the result.

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In this case, SUMPRODUCT returns the total of each number times its corresponding weight. This number is divided by the sum of all weights, calculated with SUM.

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A nice feature of this formula is that the weights don’t matter. In the example, they add up to 100%, but they can actually be any number that makes sense for your use case.

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