Combine any number of scores and weights into one overall percentage.
Weighted Average
81.9%
Across a total weight of 100
This is the general-purpose version of a weighted average calculation โ useful for any situation where several scores each count for a different proportion of a final total, not just exam grades. Add as many items as you need, each with its own score and weight.
Unlike the Semester Grade Calculator (which is framed specifically around assignments/midterm/final), this tool works with any number of arbitrary components โ useful for custom grading breakdowns, project scoring rubrics, or any weighted-average situation.
Formula
Weighted Average = ฮฃ(Score ร Weight) รท ฮฃ(Weight)
Weights don't have to add up to exactly 100 โ the formula normalises automatically by dividing by the total weight.
Worked Example
Worked example
Weights don't need to sum to 100
Because the formula divides by the total weight, you can use any consistent weighting scheme โ like assigning "credit hours" as weights instead of percentages โ and the result will still come out correctly proportioned.
Add or remove rows as needed
This tool supports any number of components โ add more rows for additional quizzes or assessments, or remove ones that don't apply, and the weighted average recalculates immediately.
Frequently Asked Questions
How is a weighted average different from a normal average?
A normal average treats every value equally. A weighted average lets some values count for more than others, based on an assigned weight โ useful when different components (like a final exam vs a small quiz) shouldn't count equally.
Do my weights have to add up to 100?
No โ the formula divides by the total weight you enter, so it works correctly whether your weights sum to 100, to 1, or to any other total.
Can I use this for something other than grades?
Yes โ this works for any weighted-average situation, such as combining scores from a scoring rubric or averaging ratings with different levels of importance.
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