Weighted Grade Calculator
Any list of scores and their weights combines into one overall percentage — a general-purpose version of grade weighting that works for any number of assignments, not tied to a specific completed/remaining course structure.
Inputs
Result
84.4%
Weights total 100%
How the weighted grade calculator works
Overall grade = Σ(score × weight) ÷ Σ(weights), for however many score/weight pairs are entered.
Total weight is also shown, since weights should typically sum to 100% for a complete, sensible grading breakdown.
Worked example: scores 88, 72, 91 with weights 30, 30, 40
- Weighted sum = 88×30 + 72×30 + 91×40 = 2,640 + 2,160 + 3,640 = 8,440.
- Total weight = 30+30+40 = 100.
- Overall grade = 8,440 ÷ 100 = 84.4%.
Common mistakes to avoid
Entering weights that don't sum to 100%
The calculator still computes a result even if weights sum to something other than 100 (like 90 or 110), but the 'total weight' detail specifically flags this — a genuine grading breakdown should typically account for the full 100% of the grade, so a mismatch is worth double-checking against the actual syllabus.
Mismatching the order of scores and weights lists
The nth score in the list is paired with the nth weight — entering scores and weights in inconsistent order (say, scores sorted differently from how the weights were listed) pairs the wrong score with the wrong weight throughout the whole calculation.
Frequently asked questions
What happens if I enter more scores than weights, or vice versa?
Any score without a matching weight entry is effectively treated as having zero weight in the total, which would understate its contribution — always keep the two lists the same length and in matching order.
How is this different from the Grade Calculator?
The Grade Calculator is specifically structured around a 'completed portion plus expected final exam' scenario with just two components; this tool handles any number of arbitrary score/weight pairs directly, useful for a full breakdown of many assignments at once.
Can weights be entered as decimals instead of whole-number percentages?
The formula works correctly either way, as long as all weights are entered consistently in the same units — mixing whole-number percentages with decimal fractions in the same list would give a wrong result.
Why check that weights total 100%?
A grading scheme should generally account for the entire grade — if weights only sum to, say, 90%, that likely means either a component was missed or the actual weighting differs from what's assumed, worth reconciling against the official syllabus.
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