Grade Scale Reference
| Letter | Percentage | GPA |
|---|---|---|
| A+ | 97–100% | 4.0 |
| A | 93–96% | 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 | 60–69% | 1.0 |
| F | Below 60% | 0.0 |
How Weighted Averages Actually Work
Suppose your syllabus breaks down like this: homework 20%, quizzes 15%, midterm 25%, final 40%. If you have a 95% homework average and an 80% on the midterm, those assignments contribute 95 × 0.20 = 19 points and 80 × 0.25 = 20 points toward your final grade. The weights must sum to 100%.
Many students miscalculate by averaging all scores equally. An 80% on a 40%-weight final hurts far more than an 80% on 10%-weight homework. This calculator handles the math properly, weighting each assignment by its contribution.
What Score Do I Need on the Final?
The formula is straightforward: Required = (Target − Current × (1 − Final Weight)) / Final Weight. If your current weighted average (excluding the final) is 88% and you want a 90% overall with a 30% final, you need (90 − 88 × 0.70) / 0.30 = 94.7% on the final. If the number exceeds 100%, the target is mathematically impossible — time to adjust expectations or negotiate extra credit.