Grade Calculator (Weighted Grades & Final Exam)
Most courses mix homework, quizzes, projects and exams that count for different percentages, so your grade is a weighted average, not a plain one. Enter each graded item with its score and weight and this grade calculator gives your current grade on the work finished so far, the letter grade and the 4.0 grade points, and — the question every student asks — what average you need on the remaining work to reach your target. Switch to the final-exam mode if you already know your current grade and the weight of the final. Scores can be percentages (92) or points (46/50), and everything runs in your browser.
How to use the grade calculator (weighted grades & final exam)
- Choose “weighted course grade” and list each graded item on its own line as Name | score | weight. Use a percentage (92) or points (46/50) for the score.
- Enter your target grade to see the average needed on the weight that is still to come.
- Read your current grade, the letter and the grade points. The table shows how much each item contributed.
- For a quick final-exam check, switch the mode, enter your current grade, the final’s weight and your target.
Formula
Weighted grade = Σ(score × weight) ÷ Σ(weight) × 100. Each item’s contribution is its score times its weight. If part of the course is still to come, average needed on the rest = (target × total weight − points earned so far) ÷ weight remaining. For a final exam worth w% with current grade c, needed = (target − c × (1 − w)) ÷ w. Letter grades follow the common US scale (A 90–100, B 80–89, C 70–79, D 60–69), with plus and minus bands; your school may differ.
Worked examples
Three graded items
Homework 90% (weight 20), a quiz 80/100 (weight 10) and a midterm 70% (weight 30) give 78.33% — a C+ — on the 60% of the course graded so far. To finish at 80% you need 82.5% on the remaining 40%.
A tough target
Aiming for 99% with the same scores needs 130% (above 100% — only possible with extra credit) — a clear sign the target is out of reach without extra credit.
Final-exam mode
With a current grade of 78%, a final worth 30% and a target of 80%, you need 84.66666667% on the final.
Planning your final exam
The maths behind it
Your course grade is a weighted average: the graded work counts for (1 − w) of the total and the final for w. Setting that equal to your target and solving for the final score gives the formula this tool uses.
Sample scenarios
| Current | Final weight | Target | Needed on final |
|---|---|---|---|
| 82% | 30% | 85% | 92% |
| 82% | 30% | 80% | 75.3% |
| 82% | 30% | 70% | 42% |
The bigger the final’s weight, the more it can change
If the final is worth 50%, a great result can move your grade up by many points, and a poor one can drag it down just as much. When the final is worth only 10%, your current grade already decides most of the outcome.
What to do with the number
Use the required score to decide how to spend study time. If the number is high, prioritise the topics worth the most marks. If it is low, protect your grade by staying consistent rather than cramming.
Practice problems
Try these yourself first, then check your answer. The answers come from the calculator above.
- Homework 88% (weight 25), a project 92/100 (weight 25) and a midterm 75% (weight 30). What is the current grade, and what average is needed on the remaining 20% to finish at 85%?
Show answer
Current grade (on work graded so far): 84.38% · Letter grade: B · Average needed on the remaining 20 to finish at 85%: 87.5%
Common mistakes to avoid
- Averaging scores without weights. A 100% on a 5% quiz and a 60% on a 50% exam does not average to 80%.
- Forgetting that weights must add up to the course total once everything is graded. Check your syllabus.
- Mixing percentages and points. Use 46/50 for points, or convert to a percentage first.
- Ignoring how your school rounds. Some round 89.5 up to an A−; others do not.
- Counting dropped scores. If the lowest quiz is dropped, remove it before entering.
Frequently asked questions
How do I calculate my grade with weights?
Multiply each score by its weight, add the results and divide by the total weight. The calculator does it and shows each item’s contribution.
How do I find the grade I need on my final exam?
Use (target − current × (1 − weight)) ÷ weight with the final’s weight as a decimal. Switch to “final exam” mode to do it automatically.
What if my total weight is not 100?
Set the “total weight” field to match your syllabus, for example 1,000 if the course uses points.
What letter grade is 89.5%?
On the common scale, 87–89.9 is a B+. Some schools round up; check your own policy.
Can I enter points instead of percentages?
Yes. Write a score as 42/50 and it is converted to a percentage.
Is this an official grade?
No. Your instructor’s gradebook is the official record; this is a planning tool.
Reviewed September 26, 2026 by the SolveCalcPro editorial team. Found a mistake? Tell us; see our editorial policy.