Grade Calculator
Grade percentage = earned points / possible points x 100.
Enter earned and possible points
Enter the points earned and points possible for an assignment, test or category. The calculator returns the percentage grade.
If your class uses weighted categories, calculate each category average first, then apply the category weights.
Use this for checking test scores, homework averages, class categories and what a score means before the final grade is posted.
If you are checking several assignments, keep each calculation separate first. Combining them too early can hide a points possible mistake.
Percentage grade meaning
The percentage shows the share of possible points you earned. If you earned 45 points out of 50, the grade is 90 percent.
A percentage is not always the final class grade. The class may use weighted categories, dropped scores, curves or school specific grading rules.
Read the result as the math for the entered values. The official gradebook may apply additional rules.
This distinction matters when students compare a test grade with a course grade. They are often related, but not the same number.
Points to percent formula
For a simple points grade, use grade percent = points earned / points possible x 100.
For weighted categories, multiply each category average by its weight. Then add the weighted category results.
If weights total 100 percent, the final weighted result is already a percentage. If weights use decimals, make sure they total 1.
76 out of 80
If you scored 42 out of 50, calculate 42 / 50 x 100. The result is 84 percent.
If homework is 30 percent of the course and your homework average is 90, it contributes 27 points to the final course grade.
If tests are 70 percent and your test average is 80, tests contribute 56 points. Together, the course grade would be 83.
Weighted gradebook traps
The most common mistake is mixing raw points with weighted categories. A 10 point quiz may matter less than a 100 point test, unless the gradebook uses category weights.
Another mistake is entering points possible as points missed. If the test is out of 80, the denominator is 80.
Also check extra credit. Some gradebooks add it to earned points, while others treat it as a separate category.
Missing assignments are another trouble spot. A zero, an excused score and a dropped score all change the math differently.
Grade Calculator FAQ
How do I calculate a grade percentage?
Divide points earned by points possible, then multiply by 100.
For example, 18 out of 20 is 18 / 20 x 100, which equals 90 percent.
Use the exact points from the assignment before applying any letter grade scale.
How do weighted grades work?
Weighted grades give each category a set share of the final grade. Tests might be 60 percent, homework 25 percent and quizzes 15 percent.
Each category average is multiplied by its weight. The weighted results are added together.
This means a small category cannot be judged only by its raw point total.
Why does my gradebook not match my point average?
Your class may use category weights, dropped scores, late penalties, curves or extra credit rules.
A simple point average only works when every point has the same value in the gradebook.
Check the syllabus or gradebook settings before assuming the calculator is wrong.
How does extra credit affect my grade?
Extra credit depends on how the teacher enters it. It may add to earned points, add to a category or add directly to the final grade.
Because methods differ, the same extra credit score can have different effects in different classes.
Use the calculator to model the method your gradebook actually uses.
Should missing assignments be entered as zero?
If the assignment is truly missing and counted as zero, enter zero earned points with the normal points possible.
If the assignment is excused or dropped, do not include it in the calculation.
This distinction matters because excused work should not lower the denominator in the same way a zero does.