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Weighted Mean Calculator — Compute the weighted average of values with weights. Enter Value,Weight per line to get an instant, accurate result.

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Weighted mean = Σ(weight × value) / Σ(weight), each value scaled by its importance before averaging.

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1. Enter the Value,Weight per line.
2. Click Calculate to see your result instantly.

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Example: With the defaults shown above, the Weighted Mean Calculator gives Weighted Mean: 78.3333.

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How is this different from a regular average?

A regular average treats every value equally; a weighted mean gives values with a higher weight more influence over the result.

What if all weights are equal?

Then the weighted mean reduces to the ordinary arithmetic mean.

What inputs does the Weighted Mean Calculator need?

You'll need to provide: Value,Weight per line. All fields use sensible defaults, so you can see a working example immediately and then adjust the values to match your own numbers.

How accurate is the Weighted Mean Calculator?

The Weighted Mean Calculator applies the formula exactly as calculated — Weighted mean = Σ(weight × value) / Σ(weight), each value scaled by its importance before averaging. — so results are precise for the inputs you provide. Accuracy depends on entering correct, realistic input values.

Is the Weighted Mean Calculator free to use?

Yes, the Weighted Mean Calculator is completely free, requires no signup, and runs instantly in your browser.

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The Weighted Mean Calculator uses a real, verifiable formula — Weighted mean = Σ(weight × value) / Σ(weight), each value scaled by its importance before averaging. — so results are accurate every time, not an approximation.