Grade Distribution Calculator
Use this grade distribution calculator to turn a list of scores into grade bands, percentages, pass rate, and summary statistics. It includes practical grade-policy options, readable results, and warnings for common grading mistakes.
How does this grade distribution calculator work?
The calculator takes the scores or grading components you enter and converts them into a practical grade summary. For weighted work, each item can have its own weight. For class summaries, the calculator reports the mean, median, score range, pass rate, and grade-band counts so the result is not just one number.
What formula is used?
For grade averages, the core formula is earned points ÷ possible points × 100. For weighted grades, each item percentage is multiplied by its weight and divided by total weight. For class statistics, the average is the sum of all scores divided by the number of included scores.
What grading policy details matter?
Before using the result as a final answer, check whether your teacher uses weighted categories, dropped scores, late penalties, extra credit, minimum scores, rounding rules, or a curve. Official grading systems can differ from simple percentage math. For general grading and GPA context, see College Board BigFuture's GPA conversion guidance and the University of Washington registrar's credit and grade point explanation.
Example
If a student earns 86/100, 92/100, and 78/100 with equal weight, the average is 85.33%. If a teacher drops the lowest score, the average becomes 89%. That difference is why the calculator separates raw scores, dropped items, and final policy-adjusted grades.
Frequently asked questions
- A grade distribution shows how many students fall into each grade band, such as A, B, C, D, and F.
- Yes. Adjust the A, B, C, D, and pass thresholds to match your course or institution.
- No. It summarizes current scores. Curving grades is a separate policy decision.
- It depends on the course, assessment difficulty, and learning goals. There is no universal perfect distribution.
- Use it for analysis. Official grades should follow your syllabus and institutional grading policy.