How to use the grade calculator
- Under Weighted grade, add a row for each assignment, test or category with its grade and its weight from your syllabus. Leave the grade empty for work that's still to come.
- Your weighted grade and letter grade update as you type.
- Under What do I need on the final?, tap the button to copy your grade across, or type your current grade, the final's weight and the grade you want.
How a weighted grade is calculated
Weighted grade = Σ(grade × weight) ÷ Σ(weight), over the work graded so far.
- Homework: 92% × 15 = 1,380
- Quizzes: 85% × 15 = 1,275
- Midterm: 78% × 25 = 1,950
- Project: 88% × 20 = 1,760
That's 6,365 ÷ 75 = 84.87%, a B, with 25% of the course (the final) still to come.
Final exam grade formula
Score needed on the final = (grade you want − current grade × (1 − final weight)) ÷ final weight, with the weight as a decimal (25% = 0.25).
With 85% now and a final worth 25%, getting 87% overall needs (87 − 85 × 0.75) ÷ 0.25 = (87 − 63.75) ÷ 0.25 = 93% on the final. A score of 80% on the same final would leave you with 63.75 + 80 × 0.25 = 83.75%.
Letter grades
The calculator uses the common US plus/minus scale below. Schools differ: some don't use plus and minus grades, and others have different cut-offs, so check your syllabus. Switch the calculator to "A–F only" for a plain 90/80/70/60 scale.
| Letter | Percentage |
|---|---|
| A | 93–100 |
| A− | 90–92.99 |
| B+ | 87–89.99 |
| B | 83–86.99 |
| B− | 80–82.99 |
| C+ | 77–79.99 |
| C | 73–76.99 |
| C− | 70–72.99 |
| D+ | 67–69.99 |
| D | 63–66.99 |
| D− | 60–62.99 |
| F | Below 60 |
Tips
- Extra credit can push a grade over 100%; the calculator accepts grades up to 200%.
- Turn letter grades into a US 4.0 GPA with the GPA calculator. Studying in India? Use the marks percentage calculator or CGPA to percentage.
- For a plain average without weights, the average calculator is quicker.
Letter-grade bands checked on 2 October 2026 against the University of the Incarnate Word and Columbia School of Professional Studies grading scales, and College Board for A–F without plus and minus. Your school's scale comes first.