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Weighted average

Excel formula: Weighted average
Generic 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.

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.

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.

Author 
Dave Bruns

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