Grade Calculator Guide: How Weighted Grades Actually Work
How weighted-category grading actually works, why a blank score isn't the same as a zero, and how to solve for a course's overall grade by hand.
A course grade built from weighted categories isn't a simple average of every assignment — each category (homework, quizzes, exams) is worth a fixed share of the final grade regardless of how many individual items sit inside it.
The weighted grade formula
- List every graded category with its weight (as a percent of the total course grade).
- Multiply each category's weight by its score.
- Add those products together.
- Divide by the total weight of the categories you're including.
Worked example
Homework is 20% of the grade at a 90% average, quizzes are 30% at 82%, and the midterm is 50% at 78%. Weighted total: (20 × 90) + (30 × 82) + (50 × 78) = 1,800 + 2,460 + 3,900 = 8,160. Divide by the total weight (100): 8,160 ÷ 100 = 81.6%.
Why an ungraded category shouldn't count as a zero
If a final exam hasn't happened yet, it has no score — not a score of zero. A "current grade" calculation should only include categories that have actually been graded, renormalized to their own weight total, rather than treating the missing category as a zero (which would make your current standing look far worse than it actually is).
Enter your categories directly in the Grade Calculator and it handles both the current-grade math and the harder reverse problem of solving for a needed score.