Calculate your test grade from points earned and total points, convert your score to a percentage, and estimate your letter grade.
Letter grades are estimated using a common grading scale. Your school or instructor may use different grade boundaries.
A test grade calculator converts the number of points you earned on a test, quiz or exam into a percentage score and estimated letter grade.
It is useful when your teacher gives you a raw score, such as 42 out of 50, and you want to know the equivalent percentage and letter grade.
The calculator can also show how many points you missed, making it easier to understand your overall test performance.
For example, if you earned 47 points out of 50, the calculator returns a test grade of 94%.
A test percentage is calculated by dividing the number of points earned by the total possible points and multiplying the result by 100.
For example, a score of 36 points out of 50 equals 72%.
The percentage can then be compared with a grading scale to estimate a letter grade such as A, B, C, D or F.
The basic formula for calculating a test grade is:
Points missed can be calculated with:
Suppose you earn 42 points on a test worth 50 points.
Percentage: (42 ÷ 50) × 100 = 84%
Points missed: 50 − 42 = 8
Estimated letter grade: B
If you earned 18 points out of 20, your percentage would be 90%, which corresponds to an estimated A- on the grading scale used by this calculator.
The calculator uses a common percentage-based grading scale to estimate a letter grade from your test score.
| Percentage | Letter Grade |
|---|---|
| 97–100% | A+ |
| 93–96.99% | A |
| 90–92.99% | A- |
| 87–89.99% | B+ |
| 83–86.99% | B |
| 80–82.99% | B- |
| 77–79.99% | C+ |
| 73–76.99% | C |
| 70–72.99% | C- |
| 67–69.99% | D+ |
| 63–66.99% | D |
| 60–62.99% | D- |
| Below 60% | F |
Your school or instructor may use different grade boundaries, so treat the letter grade as an estimate.
A test score often refers to the raw number of points earned, while a test percentage shows how much of the total available score you received.
For example, 45 out of 50 is a raw test score. Converting it to a percentage gives 90%.
Percentages make it easier to compare tests with different numbers of total points and determine an estimated letter grade.
The same formula can be used for quizzes, exams, assignments and other graded work based on points earned out of total points.
For example, earning 18 points on a 20-point quiz gives a score of 90%. Earning 73 points on an 80-point exam gives a score of 91.25%.
As long as you know the points earned and total possible points, the calculator can convert the result into a percentage.