Weighted Average
Enter values and weights, one per line, matched by position.
Result
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Enter numbers to see the result.
Sum of weights
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Items
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Formula: Weighted average = sum(value x weight) / sum(weights). Weights need not add to 1.
Compute a weighted average: enter values and their weights, one per line, matched by position.
Enter values and weights, one per line, matched by position.
Enter numbers to see the result.
Multiply each value by its weight, add those products, and divide by the total weight. A final exam worth 50% moves the average far more than a quiz worth 5%. The default example gives 90x0.5 + 80x0.3 + 70x0.2 = 83.
Any weights work: points, credits, or percentages. The tool divides by the actual weight total, so 50/30/20 gives the same answer as 0.5/0.3/0.2. Negative weights are allowed but usually signal a data error.