How to Calculate Weighted Grades
Weighted grades give different assignments or categories different levels of importance. To calculate your weighted grade:
- Multiply each grade by its weight (as a decimal)
- Add all the weighted grades together
- Divide by the sum of all weights (if not adding to 100%)
Example Calculation
If you have: Homework (20%) = 95%, Midterm (30%) = 82%, Final (50%) = 88%
(95 × 0.20) + (82 × 0.30) + (88 × 0.50) = 19 + 24.6 + 44 = 87.6%
What Grade Do I Need on My Final?
To find what you need on your final exam, use this formula:
Needed = (Target − Current × (1 − FinalWeight)) ÷ FinalWeight
For example, if your current grade is 85%, you want a 90%, and the final is worth 30%:
Needed = (90 − 85 × 0.70) ÷ 0.30 = (90 − 59.5) ÷ 0.30 = 101.67%
Standard Grading Scale
| Letter | Percentage | GPA |
|---|---|---|
| A | 93-100% | 4.0 |
| A- | 90-92% | 3.7 |
| B+ | 87-89% | 3.3 |
| B | 83-86% | 3.0 |
| B- | 80-82% | 2.7 |
| C+ | 77-79% | 2.3 |
| C | 73-76% | 2.0 |
| C- | 70-72% | 1.7 |
| D+ | 67-69% | 1.3 |
| D | 63-66% | 1.0 |
| D- | 60-62% | 0.7 |
| F | Below 60% | 0.0 |