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Weighted Average Calculator

Calculate a weighted mean from matching values and weights. The calculator accepts percentages, credits, quantities, or any consistent weighting scale.

Separate values with semicolons, spaces, commas, or line breaks.Use matching weights such as percentages, credits, quantities, or importance scores.

Weighted average

79.5
Total weight100
Items3
Weighted sum7950
Formula: Σ(value × weight) ÷ Σ(weight).

Give each value the importance it deserves

A regular average treats every value equally. A weighted average lets one observation contribute more than another, which is useful for grades, investment returns, prices, and performance scores.

How to calculate a weighted average

Multiply each value by its weight, add those products, and divide by the total of all weights. A grade worth 50% affects the result more than one worth 20%.

Example

80×20 + 90×30 + 75×50

The weighted sum is 7,950. Divide by total weight 100 to get 79.5.

Use cases

Grades, portfolios, prices, and scores

Weighted averages are useful whenever some observations matter more than others.

Frequently asked questions

Do weights need to add up to 100?

No. They can be percentages, credits, quantities, or any positive scale. The calculator divides by the total weight automatically.

What if all weights are equal?

The result is the same as a regular arithmetic mean.

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