Grade Calculator
Two calculators in one: weighted course grades with letter grades, and a final-exam target solver that tells you exactly what score you need.
1Your categories
Enter your categories to calculate.
2Breakdown
Grading scale
| Grade | A | B | C | D | F |
|---|---|---|---|---|---|
| Range | ≥ 90 | 80 – 89.9 | 70 – 79.9 | 60 – 69.9 | < 60 |
Standard US scale. Some instructors use plus/minus variants or different cutoffs — always check your syllabus.
1Your numbers
Enter your numbers to calculate.
2What this means
You’ve already locked in your desired grade — even a zero on the final keeps it. Still show up prepared.
Play with scenarios: what if the final is worth 20% instead of 40%? What if you aim for a B instead of an A?
How it works
Weighted grades
Your course grade is the weighted average: each category score multiplied by its weight, all added together. Example: homework 92% × 30% = 27.6, quizzes 85% × 20% = 17.0, midterm 78% × 20% = 15.6, final 88% × 30% = 26.4 → 86.6% (B). Weights must total exactly 100% or the result is meaningless.
Final exam targets
If your current grade is C, your desired grade is D, and the final is worth weight W (as a decimal): needed = (D − C × (1 − W)) ÷ W. Three answers are possible: a reachable target score, “already secured” (you’d keep the grade even with a zero), or “not possible” (you’d need over 100% — talk to your instructor about extra credit).
Related tools
Attendance Percentage Calculator — see how many classes you can miss and still meet your requirement.
More free tools — browse every ToolWitty calculator.
Grade calculation from toolwitty.com/ — everything runs in your browser; no grades are stored or sent anywhere.
Free Grade Calculator: Weighted Grades and Final Exam Targets
“What do I need on the final to get an A?” Every student asks it; few can answer it confidently. This free grade calculator has two tools in one. The Weighted Grade tab computes your current course grade from any number of categories — homework, quizzes, midterms, projects — each with its own weight, converts the result to a letter grade, and charts each category’s point contribution. The Final Exam Target tab works backwards from the grade you want and tells you exactly what score you need on the final to get there, including the honest answer when the math says it’s not possible.
No sign-up, no downloads — type in your numbers and get instant answers on any device. Everything runs in your browser: no grades are stored or sent anywhere.
Weighted Grade Calculator
How weighted grades work
Most courses don’t treat every assignment equally. A typical syllabus might weight homework at 30%, quizzes at 20%, the midterm at 20%, and the final exam at 30%. Your course grade is the weighted average: each category score multiplied by its weight, all added together.
Formula: course grade = Σ (category score × category weight ÷ 100)
For example: homework 92% × 30% = 27.6, quizzes 85% × 20% = 17.0, midterm 78% × 20% = 15.6, final 88% × 30% = 26.4. Total: 27.6 + 17.0 + 15.6 + 26.4 = 86.6% — a B.
Using the calculator
- Enter each category’s name, its weight as a percentage of the course, and your score in it. Leave a score blank if it isn’t graded yet — it counts as zero.
- Add or remove rows with the buttons — use as many categories as your syllabus has.
- Watch the result update live. The tool checks that your weights add up to exactly 100% and shows your weighted percentage plus the letter grade, with a bar chart of each category’s contribution.
The number-one mistake: weights that don’t total 100%
If your weights add up to 90% or 110%, the result is meaningless. The calculator validates the total and tells you the actual sum when it’s off, so you can fix a typo instead of trusting a wrong grade. Common culprits: forgetting a category the syllabus lists, or entering “points possible” instead of percentages.
Grading scale
The calculator uses the standard US letter-grade scale, also shown beneath every result:
| Grade | Percentage |
|---|---|
| A | 90 and above |
| B | 80 – 89.9 |
| C | 70 – 79.9 |
| D | 60 – 69.9 |
| F | Below 60 |
Some instructors use plus/minus variants or different cutoffs — always check your syllabus, since the scale above is the default most US schools use.
Final Exam Calculator: What Score Do I Need?
The formula
If your current grade (everything except the final) is C, your desired overall grade is D, and the final is worth weight W (as a decimal), the score you need on the final is:
needed = (D − C × (1 − W)) ÷ W
Example: you have 85%, you want 90%, and the final is worth 30% (W = 0.30). Needed = (90 − 85 × 0.70) ÷ 0.30 = (90 − 59.5) ÷ 0.30 = 101.7%. That’s over 100% — so the calculator tells you plainly that it’s not possible without extra credit, rather than showing an impossible number without context.
Three possible answers
- A target score (e.g., “You need at least 95% on the final”) — the straightforward case.
- Not possible — when the required score exceeds 100%. The calculator says so directly and suggests raising your current grade or adjusting your target.
- Already secured — when your current grade is high enough that you’d keep your desired grade even with a zero on the final. A nice surprise, and a good reason to still show up prepared.
Using it well
Enter your current grade as everything graded so far, weighted properly (use the Weighted Grade tab for this if your syllabus has categories). Enter the grade you actually want — be realistic — and the final’s weight from the syllabus. The result updates instantly, so you can play with scenarios: what if the final is worth 20% instead of 40%? What if I aim for a B+ instead of an A?
Tips for Students
- Compute your current grade early. Most grade anxiety comes from not knowing where you stand. Run the weighted calculator after midterms, not during finals week.
- Weight the final realistically. A 40%-of-grade final can swing your course grade by a full letter; a 10% final barely moves it. The calculator makes this concrete.
- “Not possible” isn’t the end. Talk to your instructor about extra credit, regrade requests, or dropping the lowest score — many syllabi include policies the raw math doesn’t show.
- Aim above the minimum. If you need 70% on the final, study for 85%. Finals are stressful; margin is your friend.
- Save your syllabus weights. Screenshot or note the category weights at the start of the term so mid-semester calculations take seconds.
- Check dropped scores. If your syllabus drops the lowest quiz or homework, remove it from the calculator — your real grade is higher than the raw average.
Disclaimer
Letter grades follow the standard US scale (A ≥ 90). Always confirm your instructor’s grading scale and syllabus policies — plus/minus cutoffs, dropped scores, and extra credit change the real outcome.