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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:

Worked Example:   Sum if equal to one of many things in Excel
=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.

Worked Example:   Count birthdays by month in Excel

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.

Worked Example:   Sum formulas only in Excel

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