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Weighted Average Calculator
Find the weighted mean of values with different weights.
Weighted average
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Weighted mean.
| Total weight | — |
|---|---|
| Weighted sum | — |
| Simple average | — |
| — |
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How the Weighted Average Calculator Works
A weighted average gives some values more influence than others. Multiply each value by its weight, add those products, and divide by the total weight. If a test worth 3 credits scores 90 and one worth 2 credits scores 80, the weighted average is (90×3 + 80×2) ÷ 5 = 86 — closer to the 90 because it carried more weight.
A plain average is just a weighted average where every weight is equal. Weighted averages appear everywhere: grades, portfolios, survey results and price indexes.
weighted average = Σ(value × weight) ÷ Σweight
Frequently Asked Questions
How do you calculate a weighted average?
Multiply each value by its weight, add the results, and divide by the sum of the weights.
How is it different from a normal average?
A normal average weights everything equally; a weighted average lets some values count more.
Where are weighted averages used?
Grades with different credit values, investment portfolios, price indexes and any average where items differ in importance.
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