Grading Scale Calculator
Convert raw scores to letter grades and GPA points using standard, custom, or curved grading scales. Calculate weighted course grades, grade needed on the final exam, and GPA impact.
Extended More scenarios, charts & detailed breakdown ▾
Professional Full parameters & maximum detail ▾
Course Grade
Final Exam Planning
How to Use This Calculator
Enter your Raw Score and Total Points for an instant percentage and letter grade. Use the Custom Scale tab to set your own grade cutoffs. The Curve tab adds a flat curve and shows your z-score. The Professional tab handles weighted categories (homework, midterm, final), calculates GPA points, and tells you the minimum score needed on your final to achieve your target grade.
Formula
Percentage = (Raw ÷ Total) × 100
Weighted Grade = Σ(Score × Weight) ÷ Σ(Weight)
Needed on Final = (Target × Total Weight − Pre-final Points) ÷ Final Weight
Example
87/100 = 87% → B+ | Weighted: HW 90% (20%) + Midterm 82% (30%) + Final 88% (50%) = 86.6% → B | To get A (90%), need 92% on final
Frequently Asked Questions
- A: 90-100%, B: 80-89%, C: 70-79%, D: 60-69%, F: below 60%. With plus/minus: A+ ≥ 97, A ≥ 93, A- ≥ 90, B+ ≥ 87, B ≥ 83, B- ≥ 80, etc.
- The 7-point scale requires higher scores for each grade: A ≥ 93%, B ≥ 86%, C ≥ 79%, D ≥ 72%. It is more common at medical schools and some universities.
- Multiply each component score by its weight, sum the products, then divide by the total weight. Example: 90% homework (20%) + 82% midterm (30%) + 88% final (50%) = (18+24.6+44)/1 = 86.6%.
- Use the Professional tab. Enter your current component scores and weights and a target course grade. The calculator solves for the minimum final exam score needed.
- A flat curve adds a fixed number of points to every student's raw score. The Curve tab also shows your z-score relative to the class mean and standard deviation to indicate where you stand.