Weighted Grade Calculator
Compute a weighted-average grade across any number of assignments. Enter score, total points, and weight per item.
- Quiz 185.00% × 1
- Midterm84.00% × 3
- Final project92.00% × 4
What this calculator does
The Weighted Grade Calculator averages individual assignments with different weights. Each row accepts your earned score, the points possible, and the weight. The tool converts each to a percentage, applies the weight, and shows the resulting overall grade plus the contribution of each assignment.
Formula
pcti = (scorei ÷ totali) × 100
weighted grade = Σ(pcti × weighti) ÷ Σ(weighti)
Variable definitions
score— Points earned on the assignment.total— Maximum points possible on the assignment.weight— How much the assignment counts. Any consistent unit — percent of course, raw weight, multiplier.
Step-by-step calculation
- For each assignment, divide the score by the total and multiply by 100 to get the percentage.
- Multiply the percentage by the assignment's weight.
- Sum the weighted percentages and sum the weights.
- Divide the weighted sum by the total weight.
- The result is the weighted-average grade in the same units as the input percentages.
Worked example
Three assignments with different stakes:
- Quiz 1: 17 / 20 = 85% × weight 1 = 85
- Midterm: 84 / 100 = 84% × weight 3 = 252
- Final project: 92 / 100 = 92% × weight 4 = 368
Weighted sum = 85 + 252 + 368 = 705; total weight = 8.
Weighted grade = 705 ÷ 8 = 88.13%.
How to use this calculator
- Enter each assignment with its score, total points, and weight.
- Leave any field blank to skip the row temporarily.
- Add or remove rows so the layout matches your gradebook.
- The overall weighted grade updates live, with each assignment's contribution shown below.
Common mistakes
- Forgetting to set "total": a default of 100 makes raw percentage entry easy, but a quiz scored out of 20 needs total = 20.
- Mixing weight units: use percentages (30, 25, 45) or raw multipliers (3, 2, 5) — but not both in the same calculation.
- Equal-weight surprise: if every row has the same weight, the result is the plain average; use unequal weights to reflect real stakes.
- Counting unfinished work as zero: blank score skips the row; entering 0 treats the assignment as completed with no credit.
Frequently asked questions
›What is a weighted grade?
A weighted grade is an average where each item counts more or less than others. Multiply each item's percentage by its weight, sum the products, and divide by the sum of weights.
›When should I use this instead of a regular average?
Use it whenever assignments aren't equal — a final worth 40% of the course, a midterm worth 25%, and homework worth 35% are weighted, not averaged plainly.
›What if I have raw scores instead of percentages?
Enter the points earned and the points possible per assignment. The calculator converts each to a percentage automatically before applying the weight.
›Do the weights have to be percentages?
No. Any consistent unit works. 1-2-3 weights produce the same average as 10-20-30 weights. The denominator is the sum of weights, so units cancel out.
›What happens with zero or negative weights?
Zero-weighted items are skipped. Negative weights aren't meaningful in academic grading, so the calculator ignores them and shows a validation hint.
›How is this different from the Grade Calculator?
The Grade Calculator works at the category level (homework, midterm, final). The Weighted Grade Calculator works one assignment at a time, with score / total / weight per row — useful when you don't have category averages handy.
›Can I use this for a single category like 'all my quizzes'?
Yes. List each quiz with its score, total, and weight (often equal weights for quizzes). The result is the category average to plug into the Grade Calculator.
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