Calculate a weighted average from a list of values and weights. Add your values to see the weighted average, the total weight and a contribution breakdown.
Add a row for each value with its weight. The calculator returns the weighted average, the total weight and the number of items, with a breakdown of each item's contribution in the summary.
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A weighted average accounts for the different importance (weight) of each value, so heavier items pull the average more than lighter ones — essential for grades, surveys and portfolio returns.
Weighted average = sum(value × weight) ÷ sum(weights)
Each item's contribution = (its weight ÷ total weight) × 100% of the result. A simple average is just the weighted average where every weight is equal.
That item is ignored, since a zero weight contributes nothing. Make sure at least one item has a positive weight.
A normal (arithmetic) average treats every value equally. A weighted average lets some values count more — the right choice when items differ in importance, size or credit hours.