ExamTally → Weighted Grade Calculator
Weighted Grade Calculator
Enter each category grade and the weight it carries — ExamTally stamps your true overall course percentage and letter grade, even when the weights don't add to 100.
A weighted grade multiplies each category grade by its weight, sums them, and divides by the total weight. Tests at 92 (40%), homework 85 (20%), quizzes 88 (15%), and a final of 80 (25%) give (92·40 + 85·20 + 88·15 + 80·25) ÷ 100 = 87%, a B. Enter your own rows below.
Key takeaways
- Weighted % = Σ(grade × weight) ÷ Σweight.
- Weights need not total 100 — the calculator normalizes them.
- Heavier categories move your grade more — a 50%-weight final dominates.
- Blank or zero-weight rows are ignored, so fill in only what you have.
- Letters use the default US scale — confirm your syllabus.
How the weighted grade is calculated
Most courses don't count every assignment equally. A syllabus might make tests 40% of the grade, homework 20%, quizzes 15%, and the final exam 25%. To combine them, each category grade is multiplied by its weight, the products are added, and the total is divided by the sum of the weights.
Dividing by the total weight is what makes the weights flexible: 40/20/15/25 and 8/4/3/5 give the same answer because only the ratios matter. It also guards against a divide-by-zero — until at least one weight is above zero, there's nothing to average.
Worked example: four categories
Take Tests 92 at 40%, Homework 85 at 20%, Quizzes 88 at 15%, and Final 80 at 25%. The weighted sum is 92·40 + 85·20 + 88·15 + 80·25 = 3680 + 1700 + 1320 + 2000 = 8700. The total weight is 40 + 20 + 15 + 25 = 100. Divide: 8700 ÷ 100 = 87%, and the stamped letter is a B. Raise the final to 90 and the total climbs to 89.5%, right on the edge of an A.
Standard A–F grading scale
| Letter | Percentage | GPA points (4.0) |
|---|---|---|
| A | 90–100% | 4.0 |
| B | 80–89% | 3.0 |
| C | 70–79% | 2.0 |
| D | 60–69% | 1.0 |
| F | Below 60% | 0.0 |
This is the most common US scale. Your school may use plus/minus grades or different cutoffs — always confirm.
When every score should count the same, use the average grade calculator. To find the exam score you need to hit a target, try the final grade calculator, or roll category grades across the term with the semester grade calculator.
Frequently asked questions
How do you calculate a weighted grade?
Multiply each grade by its weight, add those products together, then divide by the sum of the weights. For example a 92 worth 40% and an 80 worth 60% is (92×40 + 80×60) ÷ (40 + 60) = 8480 ÷ 100 = 84.8%.
Do the weights have to add up to 100%?
No. Because the calculator divides by the total of the weights, any weights work — 40/30/30, 2/1/1, or even raw point values. They only need to reflect the relative importance of each category. If they do add to 100, the weighted average reads as a clean percentage.
What is the difference between a weighted grade and a simple average?
A simple average treats every score equally. A weighted grade lets some categories count more — so a final worth 50% moves your grade far more than a quiz worth 5%. Use the average grade calculator when everything counts the same.
What letter grade does my weighted percentage earn?
On the default US scale: A is 90–100%, B is 80–89%, C is 70–79%, D is 60–69%, and F is below 60%. The badge recolors with the letter. Schools often use plus/minus bands, so confirm your syllabus.
Can I leave a category blank or set its weight to zero?
Yes. Rows with a blank or zero weight are ignored, so you can fill in only the categories you have so far. As long as at least one weight is above zero, the calculator returns a result; otherwise it waits for input.
How is the weighted percentage rounded?
The overall score is rounded to one decimal place; a whole-number result shows without a decimal. Your instructor may round differently or apply their own cutoffs, so treat borderline letters as estimates and check the syllabus.
The weighted grade is mathematical: the sum of each grade times its weight, divided by the sum of the weights. Letter-grade bands use the common US scale (A 90+, B 80+, C 70+, D 60+, F below 60); individual schools set their own cutoffs, pluses/minuses, and rounding rules.
Last reviewed 2026-06-28