Weighted Average Calculator
Average values with different weights, like grades or portfolios.
Weighted average
87.55
Unweighted mean
86.3333
Total weight
100
When every value isn't equal
A weighted average multiplies each value by its importance before averaging: exam scores by their syllabus weight, portfolio returns by position size, review stars by vote counts. With weights 30/45/25, the middle score dominates the result.
Weights as percentages or not
Weights needn't sum to 100 — the formula divides by their total, so 30/45/25 and 6/9/5 give identical results. What matters is their ratio. A plain mean is just the special case where every weight equals one.
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