How Weighted Grades Work
Most courses don't average scores equally — they weight categories: homework 20%, quizzes 20%, midterm 25%, final 35%. Your course grade is the weighted average:
Worked example
| Category | Score | Weight | Contribution |
|---|---|---|---|
| Homework | 92% | 20% | 18.4 |
| Quizzes | 85% | 20% | 17.0 |
| Midterm | 78% | 25% | 19.5 |
| Final | — | 35% | ? |
Current standing on completed work: (18.4+17.0+19.5) ÷ 0.65 = 84.5%. The calculator does this live as you add rows — any number of categories, any weights.
"What Do I Need on the Final?"
The question every student asks in week 14 has a clean formula:
Continuing the example — target 87% (B+/A− line), 65% of the course complete at 84.5%:
| Target course grade | Needed on final (35%) |
|---|---|
| 80% | 71.7% |
| 85% | 86.0% |
| 90% | 100.3% — not achievable |
That last row is valuable information early: knowing a target is out of reach (or safe) changes how you allocate finals week.
Letter Grades and Percentages
The common US scale (schools vary — check your syllabus):
| Letter | Percent | GPA points |
|---|---|---|
| A / A− | 93–100 / 90–92 | 4.0 / 3.7 |
| B+ / B / B− | 87–89 / 83–86 / 80–82 | 3.3 / 3.0 / 2.7 |
| C+ / C / C− | 77–79 / 73–76 / 70–72 | 2.3 / 2.0 / 1.7 |
| D / F | 60–69 / below 60 | 1.0 / 0.0 |
For semester-level GPA across courses, continue to the GPA Calculator — this tool settles the single-course number that feeds it.
Using It Strategically
- Audit weights from the syllabus first — a 10% homework category can't rescue a bombed 40% final, and vice versa.
- Run scenarios early: knowing in week 8 that you need 85%+ on everything remaining changes behavior while it can still matter.
- Watch drop policies: "lowest quiz dropped" effectively re-weights — recalculate with it removed.
- Points-based courses: convert to percentages per category first (points earned ÷ points possible), then weight.
The Bottom Line
A course grade is just a weighted average, and the weighted average is just arithmetic — which means your academic standing is always knowable, weeks before the registrar makes it official. Enter your categories above, check the current number, and let the "needed on final" figure decide where finals-week hours actually go.