How to use this test grade calculator
This test grade calculator turns a raw test score into a percentage and letter grade. Enter the total number of questions, choose whether you want to type wrong answers or correct answers, and select the grading scale used by your class. The result and the complete grading table update instantly; there is no submit button and no sign-up.
Students often call this a test score calculator or quiz grade calculator. Teachers may call the same tool an easy grader or teacher grader because the table makes it quick to look up every possible score while marking a stack of quizzes. Those names describe one task, so this page keeps them together in one calculator.
Test grade formula
Percentage = Correct answers ÷ Total questions × 100
First subtract wrong answers from the total if you started with mistakes. Next divide the number answered correctly by the total number of questions. Multiply that decimal by 100 to get the percentage. The selected grading scale then maps the percentage to a letter grade.
For example, answering 16 of 20 questions correctly gives 16 ÷ 20 × 100 = 80%. On the standard 10-point scale, an 80% is a B. The math for the percentage never changes when you switch scales; only the letter-grade cutoff changes.
Example: what grade is 16 out of 20?
A 20-question quiz with 4 wrong answers has 16 correct answers.
Percentage = 16 ÷ 20 × 100 = 80%.
On the standard 10-point scale, 80% is a B. Plus/minus grading gives a B−, while the 7-point scale gives a C.
This same method answers nearby questions such as 18 out of 20, 42 out of 50, or 75 out of 100. You do not need a separate page for each fraction: change the inputs and this calculator produces the exact percentage, letter, and complete table for that test.
How the complete grading table works
The grading table lists every possible whole-question result from zero wrong through every question wrong. Each row includes Wrong, Correct, Percentage, and Letter Grade. The current result is marked so you can find it quickly without relying only on color. If you change the total questions or grading scale, the entire table is rebuilt from the same rules used by the main result.
For teachers, this works like a printable grading chart without requiring a download. Set the number of questions once, then scan the Wrong column as you grade. For students, the chart shows how much each question is worth and how one more correct answer could change the percentage or letter grade.
Common grading scales
The default standard 10-point scale assigns A at 90–100, B at 80–89.99, C at 70–79.99, D at 60–69.99, and F below 60. It is a familiar starting point for many U.S. classes, but it is not a national rule.
The plus/minus scale divides most letter bands into smaller ranges. For example, 90–92.99 is A−, 87–89.99 is B+, 83–86.99 is B, and 80–82.99 is B−. This gives more detail when two percentages fall within the same broad letter band.
The stricter 7-point scale starts A at 93, B at 85, C at 77, D at 70, and F below 70. Select it only if it matches the policy your teacher or school publishes. Curves, dropped questions, partial credit, and custom cutoffs can all produce a different result.
Wrong answers vs. correct answers
Use Wrong mode when you are grading a paper and counting mistakes. Use Correct mode when a gradebook already reports the number earned. Switching modes preserves the same valid score: 4 wrong out of 20 becomes 16 correct out of 20, while the percentage and letter stay unchanged.
This first version uses whole questions from 1 through 500. It does not support half points or custom point values. If an exam uses partial credit, calculate earned points divided by possible points first. You can then use the grade converter to map that percentage onto the grading scale your school uses.
Test grade vs. final course grade
A test grade tells you how you performed on one quiz, exam, or worksheet. It does not tell you what you need on a future final exam to reach a target course grade. For that planning question, use the final grade calculator with your current course grade, target grade, and final exam weight.
If your course combines homework, quizzes, projects, and exams with different weights, use the weighted grade calculator. If you need to combine course letters and credit hours, use the GPA calculator. Each tool handles a separate step rather than mixing several grading questions into one form.
Frequently asked questions
How do I calculate my test grade?
Subtract wrong answers from total questions to get correct answers. Divide correct answers by total questions, then multiply by 100. This calculator performs every step and assigns a letter grade.
What grade is 16 out of 20?
16 out of 20 is 80%. On the standard 10-point grading scale, 80% is a B. A different school scale may assign another letter grade.
Can I enter correct answers instead of wrong answers?
Yes. Switch the input mode from Wrong to Correct, then enter how many questions you answered correctly. The percentage and grading table update immediately.
What grading scale does this test grade calculator use?
The default is the standard 10-point scale: A is 90% or higher, B is 80% or higher, C is 70% or higher, D is 60% or higher, and F is below 60%. You can also choose plus/minus or 7-point grading.
Is an easy grader the same as a test grade calculator?
Yes. Easy grader, teacher grader, test score calculator, and quiz grade calculator commonly describe the same task: convert correct or wrong answers into a percentage and letter grade.
Why might my teacher give a different letter grade?
Schools and teachers can use different cutoffs, curves, partial credit, or custom grading policies. Select the closest scale here, but always follow the official grading rules for your class.
Does this calculator support partial credit?
No. This version uses whole questions from 1 to 500 and whole-number correct or wrong answers. For partial credit, calculate the earned percentage from points first and use the grade converter.