What is a Grade Calculator?
A grade calculator answers two different questions, and courses are usually set up so that you need both. The first is what your mark currently is: courses are divided into categories — homework, quizzes, a midterm, a final — each carrying a percentage of the total, and your mark is the weighted average of the scores you have so far. The second is what you need next: the score on the remaining work that would bring the total to a target.
The weighted average is where people go wrong most often. If homework is 20% of the course and you scored 88%, that contributes 17.6 percentage points, not 88. Adding the raw scores and dividing gives a different and wrong answer whenever the weights are unequal. This tool multiplies each score by its weight, sums the products and divides by the weight graded so far — so the figure is your standing in the course, not a mixture of numbers with different meanings.
The second mode is the one that makes a final exam tractable. Given your current mark, the weight the final carries and the grade you want, the required score is a single rearrangement of the same weighted average. It is worth running before the exam rather than after, because it turns an abstract target into a number — and sometimes reveals the target is already secured or no longer reachable, both of which change how much the exam matters.
How to calculate a course grade
- Choose the mode. Weighted categories works out your standing now; What do I need on the final? works backwards from a target.
- In categories mode, add a row per graded component: its name, its weight as a percentage of the course, and the score you received.
- Leave the score blank for anything not yet graded. Those rows still count toward the outstanding weight, so the highest and lowest grades still possible stay meaningful.
- Read the overall grade so far, then the two extremes beneath it. The gap between them is how much is still undecided.
- Add curve or bonus points as a flat number if your instructor awards them to the final mark.
- For the final exam, enter your current mark, the weight the exam carries and the grade you want. The result is the score on that exam alone.
Grade Calculator limits and rules
| Item | Limit |
|---|---|
| Weighted average | Scores multiplied by their weights, divided by the weight graded so far |
| Weights | Any percentage values; a total other than 100 is allowed but flagged |
| Ungraded rows | Counted toward outstanding weight, not toward the current average |
| Best case | Assumes every outstanding category scores 100% |
| Worst case | Assumes every outstanding category scores 0% |
| Curve or bonus | Added as flat points to the final mark, before the letter is decided |
| Final-exam mode | One remaining component, weighted as a percentage of the whole course |
| Letter boundaries | 93/90/87/83/80/77/73/70/67/63/60, a common US set — not universal |
| Not included | Dropped lowest scores, replacement policies, extra credit as a category, and rounding rules from a syllabus |
| Rounding | Percentages shown to two decimals; many instructors round only the final mark |
When to use it
- Checking what a midterm did to your standing, and how much of the course is still ungraded.
- Working out before the final exam what score turns a B into an A — the calculation that decides how much revision the exam deserves.
- Confirming that a target is already mathematically secured, so a difficult exam can be approached without the grade hanging on it.
- Modelling a syllabus at the start of term, by trying different weights against the scores you realistically expect.
- Settling a disagreement about a mark by showing the weighted arithmetic with the weights and scores laid out.
Is it private?
Everything runs inside your browser. Your text and files are never uploaded, never stored and never seen by anyone else — including me. You can use the tool with the network tab open and watch no request leave the page. Closing the tab erases the input.
Frequently asked questions
Subtract the weighted score you have already locked in from the target, then divide by the weight of the final. If your current mark is 78% and the final is worth 25% of the course, the other 75% already contributes 78 × 0.75 = 58.5 points; for an 85% overall you need 26.5 more from a component worth 25 points, so 106% — which is not reachable.
The usual causes are dropped lowest scores, a category weight you have misread, extra credit counted as its own category, or a policy where a final exam replaces a lower midterm mark. The arithmetic here is standard weighted averaging; the rules around it are what differ.
No — that is what it is for. A blank row is treated as outstanding, so it counts toward the weight still to come and appears in the best-case and worst-case figures. Fill it in only when a score exists.
The range that is still achievable. The worst case assumes you score nothing on everything outstanding — the floor you cannot fall below. The best case assumes a perfect score on all of it. If the target sits below the worst case it is already secured; above the best case it is gone.
It works for any set of components with weights that total 100. For a semester of separate courses each with credit values, the GPA calculator weights the courses by credit instead, which is the correct way to average across subjects.
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Written and maintained by Md. Nur Hossain Repon.