How to Use This Calculator
- Add assignments: Input scores and syllabus weights for completed homework, quizzes, and tests.
- Set final target: Specify the final overall grade percentage you want to achieve (e.g. 90% for A−).
- Enter final exam weight: Input the weight of your upcoming final exam to discover the exact minimum score required.
Formula and Calculation Steps
Weighted Grade = Σ (Score × Weight) ÷ Σ Weight
Required Final Score = [ Target − (Current Grade × (1 − Final Weight)) ] ÷ Final WeightWorked Examples and Reference Table
| Current Grade | Desired Grade | Final Exam Weight | Score Needed |
|---|---|---|---|
| 85% | 90% (A-) | 30% | 101.7% (Extra credit needed) |
| 88% | 90% (A-) | 30% | 94.7% |
| 92% | 90% (A-) | 25% | 84.0% |
| 78% | 80% (B-) | 40% | 83.0% |
Frequently Asked Questions
How do you calculate a weighted grade?
Multiply each assignment or exam grade by its assigned weight percentage, sum these products together, and divide by the total sum of weights: Weighted Grade = Σ (Grade × Weight) ÷ Σ (Weight).
How do you calculate what score you need on the final exam?
Use the formula: Required Final Score = [ Target Class Grade − (Current Grade × Current Weight) ] ÷ Final Exam Weight. For example, if you have an 85% going into a 30% final and want a 90% overall, you need a 101.7%.
What if total weights do not add up to 100%?
If your semester is still in progress and completed assignments total less than 100% (e.g., 70%), the calculator normalizes your average by dividing by 70%, showing your true current standing.
What is the standard college grading scale?
Standard letter grades are: A (93–100%), A− (90–92%), B+ (87–89%), B (83–86%), B− (80–82%), C+ (77–79%), C (73–76%), C− (70–72%), D (60–69%), and F (below 60%).
Can extra credit raise my weighted grade above 100%?
Yes. If your course offers bonus points or extra credit assignments, scores above 100% will raise your weighted average accordingly.