A grade calculator turns your assignment scores and their weights into a single course grade. Add one row per assignment with its score and weight, and the tool computes your current weighted grade and letter grade instantly. If your class has a final exam coming up, the solver below tells you exactly what score you need on it to reach your target.
Your assignments
| Assignment | Score (%) | Weight (%) | |
|---|---|---|---|
| Total weight | 0% |
Letter grade scale
This tool uses the fixed standard scale below. If your school uses plus/minus grades or different cutoffs, apply your own scale to the percentage shown above.
| Letter | Percentage range |
|---|---|
| A | 90 – 100 |
| B | 80 – 89 |
| C | 70 – 79 |
| D | 60 – 69 |
| F | Below 60 |
What do I need on the final exam?
How do I calculate my weighted grade?
Multiply each score by its weight, add the products, and divide by the total weight. Example: homework 92 at 20% weight and a midterm 78 at 30% weight contribute (92 × 0.20) + (78 × 0.30) = 18.4 + 23.4 = 41.8 points.
The rows above do this for you: add every assignment, quiz and exam with the weight from your syllabus, and your current grade updates as you type.
What do I need on the final to get an A?
Use the formula: required = (target − current × (1 − final weight)) / final weight. With a current grade of 85%, a 90% target and a final worth 20%, you would need (90 − 85 × 0.80) / 0.20 = 110% — impossible, so aim lower or ask about extra credit.
The solver above runs this instantly and tells you plainly whether the target is reachable, already secured, or mathematically impossible.
What letter grade will I get?
This tool uses the standard scale: A is 90–100, B is 80–89, C is 70–79, D is 60–69 and F is below 60. The scale table above documents it.
Schools differ: some use plus/minus grades (A−, B+) or shift cutoffs. Take the percentage this calculator shows and map it to your own school's scale.
What if my weights don't add to 100%?
The calculator normalizes: it divides by whatever total weight you entered, so the math still works. You also get a warning showing the actual total, in case a weight was mistyped or an assignment is missing.
Common causes: a dropped lowest score, extra credit over 100%, or a syllabus that weights categories (homework, exams) separately. Enter the category weights and the tool handles the rest.
Is a grade calculator the same as a GPA calculator?
No. A grade calculator works in percentages for a single course; a GPA calculator converts letter grades across many courses into a 4.0-scale GPA. If you need a GPA, use the GPA Calculator instead.
Use this page during the semester to track one class, then feed each course's final letter grade into the GPA calculator at the end of the term.
Frequently asked questions
How do I calculate my weighted grade?
Multiply each assignment score by its weight, add the results, then divide by the total weight. For example, 92 at 20% and 78 at 30% contribute (92 x 0.20) + (78 x 0.30) = 18.4 + 23.4 = 41.8 points from those two items.
What if my weights don't add up to 100%?
The calculator still works: it normalizes your weights, dividing by the total weight you entered. A clear warning tells you the weights sum to something other than 100% so you can double-check them.
How does the final exam solver work?
It uses: required = (target - current x (1 - final weight)) / final weight. For example, with a current grade of 85%, a target of 90% and a final worth 20%, you would need (90 - 85 x 0.80) / 0.20 = 110% - mathematically impossible, which the calculator tells you plainly.
What does "mathematically impossible" mean?
The score you would need on the final is over 100%, which cannot be earned. Even a perfect final would not reach your target with the current weighting. You can lower your target or talk to your instructor about extra credit.
What letter grade scale does this use?
The standard fixed scale: A = 90-100, B = 80-89, C = 70-79, D = 60-69, F = below 60. If your school uses plus/minus grades or different cutoffs, use the percentage shown here and map it to your school's scale.
How is this different from a GPA calculator?
This tool works in percentages for one course. A GPA calculator converts letter grades across multiple courses into a 4.0-scale GPA. If you need that, see the GPA Calculator linked below.
Is this grade calculator free?
Yes. It is one of 193 free online tools on ZeroFee Tools. All calculations run entirely in your browser - no signup, no limits, nothing uploaded.