How to calculate weighted grades
Multiply each assignment's grade by its weight, sum the products, then divide by the total weight.
weighted grade = Σ(grade × weight) ÷ Σ(weights)
Example syllabus
- Homework 85% (weight 20%) → 85 × 0.20 = 17.0
- Midterm 78% (weight 30%) → 78 × 0.30 = 23.4
- Final 90% (weight 50%) → 90 × 0.50 = 45.0
Total: 85.4% = B
What grade do I need on the final?
needed = (target − current × (1 − weight)) ÷ weight
If you have 82% going into the final (worth 30%) and want an overall 85%:
- Current contribution: 82 × 0.70 = 57.4
- Needed total minus that: 85 − 57.4 = 27.6
- Divide by final weight: 27.6 ÷ 0.30 = 92%
If the number exceeds 100%, your target is mathematically impossible. If it's very low (even negative), you've already secured your desired grade.
Grading scale
| 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+ | 67–69% | 1.3 |
| D | 63–66% | 1.0 |
| D- | 60–62% | 0.7 |
| F | Below 60% | 0.0 |
Frequently asked questions
How do I calculate a weighted grade?
Multiply each assignment's grade by its weight (as a decimal), sum the products, then divide by the total weight. Formula: weighted grade = Σ(grade × weight) ÷ Σ(weights). Example: Homework 85% (weight 20%), Midterm 78% (weight 30%), Final 90% (weight 50%). Weighted = (85×0.20) + (78×0.30) + (90×0.50) = 17 + 23.4 + 45 = 85.4%. Our calculator does this for any number of assignments and weights.
How do I calculate what grade I need on the final?
Formula: needed = (desired_final − current × (1 − final_weight)) ÷ final_weight. If you have 82% going into the final worth 30%, and want an overall 85%: needed = (85 − 82 × 0.70) ÷ 0.30 = (85 − 57.4) ÷ 0.30 = 92%. If the calculation gives more than 100%, your target is mathematically impossible. If it gives a low number (even negative), you've already secured your desired grade.
What grade is 85%?
85% is typically a B (grade points 3.0 on the 4.0 scale). The standard US scale: 90–100% = A (4.0), 80–89% = B (3.0), 70–79% = C (2.0), 60–69% = D (1.0), below 60% = F (0.0). With +/- grades: 83–86% = B, 87–89% = B+, 90–92% = A-. Check your school's specific scale — some use 10-point ranges, others use letter-only without +/-.
What does GPA mean?
GPA stands for Grade Point Average. On the standard unweighted 4.0 scale: A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0. GPA is calculated by multiplying each class's grade points by its credit hours, summing, and dividing by total credits. A '4.0 student' has all A's. Use our GPA Calculator for full multi-course computation.
How do I calculate my semester average?
Sum all your assignment grades weighted by their worth (assignments 20%, quizzes 20%, midterm 25%, final 35%, etc.), then divide by total weight. Our weighted grade calculator handles this — enter each grade with its percentage weight. If all assignments have equal weight, just average them directly.
What happens if my weights don't add to 100%?
Our calculator normalizes automatically. If your weights sum to 90% (you forgot a category), we divide by 0.90 instead of 1.00. But for accurate results, your weights should sum to 100%. Common syllabus: 20% HW + 20% Quizzes + 25% Midterm + 35% Final = 100%. Adjust weights if your syllabus uses different categories.
Is a 3.5 GPA good?
Yes, a 3.5 GPA is very good — roughly a B+/A- average. It puts you in Dean's List territory at most colleges and is competitive for graduate school admission to many programs (though top programs often expect 3.7+). In high school, 3.5 unweighted is above average and competitive for most colleges. For context: 2.0 = minimum to graduate most programs; 3.0 = solid B; 3.5 = Dean's List; 3.7+ = top 10–15% of students.
How do extra credit points work?
Extra credit is added to your score total, but the weights stay the same. If you got 95/100 on a test with 5 extra credit points, your effective score is 100/100. Some teachers cap at 100%; others let you exceed. For grade calculations, enter the higher score (95 + 5 = 100) into the grade field. Extra credit that's separate from main assignments is often added as a bonus to the final grade.