Test Grade Calculator
Minimum percentage required for each grade.
For example, 33 correct answers out of 40 questions gives a score of 82.5%.
The letter grade is based on the grading scale shown above. You can customize the minimum percentage for each grade.
How to Calculate Your Test Grade
Your test percentage is calculated by dividing the number of correct answers by the total number of questions and multiplying the result by 100.
For example, if you answered 36 out of 40 questions correctly:
Your test score is therefore 90%. The letter grade depends on the grading scale used by your school, teacher, or institution.
How to Calculate a Test Grade from Wrong Answers
If you know how many questions you got wrong instead of how many you got correct, subtract the wrong answers from the total number of questions first.
For example, if a test has 50 questions and you got 7 wrong:
(43 ÷ 50) × 100 = 86%
Your test percentage would be 86%.
Test Grade Percentage Chart
The percentage-to-letter-grade conversion is not universal. Different schools and instructors may use different grading scales. The following is a commonly used example:
| Percentage | Letter Grade |
|---|---|
| 90–100% | A |
| 80–89% | B |
| 70–79% | C |
| 60–69% | D |
| Below 60% | F |
Your actual letter grade may be different if your school or instructor uses another grading scale. You can use the calculator’s custom grading scale to enter your own thresholds.
Test Grade Calculator Formula
The basic formula for calculating a test percentage is:
When every question has the same value, this formula gives the percentage score directly. If questions have different point values, the calculation should instead be based on points earned and total points available.
Frequently Asked Questions
How do I calculate my test grade?
Divide the number of correct answers by the total number of questions and multiply by 100. For example, 18 correct answers out of 20 questions gives a score of 90%.
How do I calculate my grade if I know the wrong answers?
Subtract the number of wrong answers from the total number of questions to find the number of correct answers. Then divide the correct answers by the total and multiply by 100.
What is 33 out of 40 as a percentage?
33 out of 40 is 82.5%.
Does the letter grade depend on the percentage?
Yes, but the exact letter grade depends on the grading scale being used. For example, an 82.5% score may correspond to a B on one grading scale and a different grade on another.