Weighted Average

Compute a weighted average from a list of values and a matching list of weights. Ideal for GPAs, survey scores and any figure where some entries count more than others.

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Worked example

Weighted avg: 83

How it’s solved

Worked on the example above, step by step — follow along and you can do it on paper next time, no tool required.

A weighted average lets some entries count more: multiply each value by its weight, add those up, then divide by the total weight.
Multiply each value by its weight and add
90×50 + 80×30 + 70×20 = 8,300
Divide by the total of the weights
8,300 ÷ 100 = 83

Learn the method

Inputs

Values (comma)
90, 80, 70
Weights (comma)
50, 30, 20

Frequently asked

How do the two lists line up?

The first value pairs with the first weight, and so on. Missing weights count as zero.

What if all weights are equal?

You get the ordinary mean, since equal weights cancel out.