What is a gradebook calculator?
A gradebook calculator combines scores from every graded category in a course—homework, quizzes, labs, midterms, a final exam—into a single overall percentage. Unlike a single-test grade calculator, it doesn't treat every score equally. Each category is multiplied by its own weight, so a final exam worth 20% of the course affects the total far more than one homework set worth 5%.
How the weighted formula works
Multiply each category's score by its weight, add the results together, and divide by the total weight. Because every weight is a share of the whole course, they should add up to 100% for the overall percentage to represent a complete, accurate grade.
| Category | Weight | Score | Contribution |
|---|---|---|---|
| Homework | 20% | 90% | 18.0 |
| Quizzes | 30% | 85% | 25.5 |
| Midterm | 30% | 80% | 24.0 |
| Final exam | 20% | 70% | 14.0 |
Adding the contributions gives 81.5, and dividing by the 100% total weight gives an 81.5% overall course grade—the same numbers used as the calculator's starting example above.
Common input mistakes that skew the result
Gradebook calculator vs. other grade tools
Use this calculator for a whole course made up of multiple weighted categories. For a single test, quiz, or assignment, the grade calculator converts wrong answers or missed points into one percentage and letter grade. If you already know your current categories but need the exact score required on a remaining exam, the final grade calculator solves for that number directly.
Percentage, letter grade, and GPA
Once you have an overall course percentage, convert it to a letter grade and GPA using your school's scale. Thresholds vary by school and sometimes by class, so check the US grading scale guide for standard, strict, and lenient percentage ranges before assuming a specific letter grade.