Weighted Average Calculator
Calculate a weighted average, where some values count more than others.
When values aren't equal
A weighted average lets some values count more heavily than others, unlike a plain average where every value counts the same. This calculates it from your values and their weights, which is how grades, ratings and many real averages actually work.
Enter your values and their weights to find the weighted average.
Where weighting is the honest average
Weighted averages appear constantly once you look. A course grade where the final exam counts more than a quiz is a weighted average, and treating them equally would give the wrong result. An investment portfolio's return weights each holding by how much is invested in it. Any average where the items differ in importance, size or frequency needs weighting to be meaningful — averaging the prices of two products without accounting for how many of each sold gives a misleading figure. The plain average is really just the special case where all the weights happen to be equal. Recognising when values should not count equally, and weighting them accordingly, is what makes an average an honest summary rather than a distortion.
Common questions
How is a weighted average different from a plain one?
Some values count more heavily according to their weights, rather than every value counting equally — which is how grades and portfolio returns work.
When do I need to weight an average?
Whenever the items differ in importance, size or frequency — like an exam counting more than a quiz, or prices weighted by quantity sold.
Is anything uploaded?
No. The calculation happens in your browser.