Weighted Percentage Calculator
Give every item a value and a weight — the calculator normalises and returns the weighted average, whatever the weights add up to.
Weighted average
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Enter a value and a weight for at least one item to see the weighted average.
Estimates for planning only. Your university's own rules and records are the final authority.
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How this calculator works
Weighted averages run quietly through everything academic: your course grade weights each assessment, your GPA weights each course by credit hours, and your final percentage is one grand weighted combination of both. This calculator isolates the operation itself. Enter any items — values and weights — and see the properly normalised average, free of any assumption about what the numbers mean.
The formula
Weighted average
Weighted average = Σ (value × weight) ÷ Σ (weight)
That is the whole idea. Each value is multiplied by its weight, everything is added, and the total is divided by the sum of the weights. Normalisation is what makes weights flexible: they never need to reach 100 — the division handles the scale for you.
A worked example
Scores of 60, 80 and 70 with weights of 25, 25 and 50 give (60×25 + 80×25 + 70×50) ÷ 100 = 7,000 ÷ 100 = 70. Now try the same scores with relative weights 1, 1 and 2: (60 + 80 + 140) ÷ 4 = 70 — identical, because only the ratios mattered. Change the middle weight from 1 to 3 and the average rises to (60 + 240 + 140) ÷ 6 ≈ 73.33: the higher score now pulls harder.
Where students use it
- Custom marking schemes. When your instructor publishes relative weights — “the project counts double the quizzes” — enter them as 2 and 1.
- Combining overlapping components. Two partial scores on the same assessment combine cleanly when you weight them by the marks each covered.
- Cross-checking other tools. If the course total calculator and this page disagree, one set of inputs is off — a useful sanity check before trusting either number.
One condition
All values must share a unit. Averaging a percentage with raw marks or a GPA with credit hours produces arithmetic that is valid but meaningless. Keep the unit consistent, keep the weights proportional to importance, and the result will be exactly what a weighted average should be. As with every nuSkor tool: it runs entirely in your browser, and official records remain the final authority.