A simple average gives every number equal importance. A weighted average gives each score the importance set by its weight, then divides the weighted total by the total weight.
Worked example
Suppose an exam score is 80% with a weight of 60, a project score is 90% with a weight of 30, and a smaller task is 70% with a weight of 10. The calculation is (80×60 + 90×30 + 70×10) ÷ 100 = 82%.
Check the rulebook
Real grade systems may use minimum scores, excluded work, attendance requirements, rounding, or a different interpretation of weights. The tool is only a way to show arithmetic from the values you enter.
Make the weights visible
When sharing the result, include the components and weights so another person can check them. Use the weighted average calculator to show the full formula.
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