EDUCATION CALCULATOR
Calculate your test percentage and letter grade from correct answers and total questions. Explore missed questions, target scores, grading thresholds, examples, and practical study-planning guidance.
Turn correct answers into a percentage and letter grade.
Your displayed result changes only when you click Calculate Grade.
Enter your correct answers and total questions, then calculate to see your percentage, letter grade, missed questions, and target-grade planning.
A test grade calculator converts the number of questions you got correct into a percentage. If a test has equally weighted questions, the calculation is straightforward: divide correct answers by total questions and multiply by 100.
This calculator goes beyond the percentage. It also shows an equivalent letter grade, questions missed, target-score thresholds, and scenario planning so you can understand what different scores mean before or after an exam.
When every question is worth the same amount, use the simple percentage formula below. The same formula works whether your test has 10 questions, 25 questions, 50 questions, or 100 questions.
Determine how many questions received full credit.
Use the number of scored questions on the test.
Divide correct answers by total questions.
Multiply the decimal result by 100.
Suppose you answered 18 questions correctly on a 20-question test. Divide 18 by 20 to get 0.90, then multiply by 100. Your test score is 90%. Under the reference scale used by this calculator, that corresponds to an A-.
The table below gives quick reference examples for equally weighted questions. Your instructor may use a different grading scale, extra credit, dropped questions, or weighted sections.
| Correct / Total | Percentage | Reference grade |
|---|---|---|
| 18 / 20 | 90% | A- |
| 42 / 50 | 84% | B |
| 45 / 50 | 90% | A- |
| 87 / 100 | 87% | B+ |
| 92 / 100 | 92% | A- |
Percentage-to-letter conversion is not universal. Schools and instructors can define their own boundaries. The following reference scale is the same A+–F model used by the calculator.
If your syllabus uses a different boundary, treat the percentage as the authoritative score and compare it with your instructor's grading policy. For course-level planning, the course grade tool can help interpret an assessment score, while the final exam planner can estimate what you need on a final exam.
A useful way to think about a test is to work backward from your target grade. If every question has equal weight, the minimum number of correct answers for a target percentage is the target percentage multiplied by the total number of questions, rounded up to a whole question.
On a 10-question quiz, one question represents 10 percentage points. On a 100-question test, one question represents one percentage point. That means a single mistake has a much larger effect on a short quiz. Use the calculator's points-per-question result to see exactly how much each question is worth.
Your test percentage is not necessarily your final course grade. A test may represent only one portion of the course. Homework, projects, quizzes, participation, and exams can each carry different weights.
If you want to combine multiple assessments into an overall course grade, use the Grade Calculator or a weighted grading method. If you already know your current course grade and want to plan for a final exam, use the final exam planner.
Usually based on points earned divided by points possible.
Combines assignments, tests, projects, and other weighted work.
Summarizes course grades, commonly using a grade-point scale.
The basic calculator assumes each question contributes equally. That assumption does not apply when some questions are worth more points, essay questions receive partial credit, or test sections have different weights.
For a points-based assessment, calculate points earned ÷ points possible × 100 instead of simply counting questions. The points-to-grade calculator is designed for that points-based situation.
A score is most useful when it tells you what to do next. After calculating your grade, identify the topics behind the questions you missed. Separate knowledge gaps from careless mistakes, timing problems, or questions you misunderstood.
Group missed questions by topic instead of reviewing everything equally.
Decide whether each mistake came from knowledge, process, reading, or time pressure.
Work new problems without immediately looking at the answer.
Use a short practice test to check whether the weak area improved.
Compare future scores and look for consistent improvement rather than one isolated result.
Use target thresholds to decide how many questions you need to get right next time.
These tools answer different academic questions. This page focuses on a single equally weighted test. The points-based grade tool handles points earned versus points possible, while the GPA tool summarizes course performance using grade points and credit hours.
Divide correct answers by total questions and multiply by 100 when every question is worth the same amount.
18 out of 20 is 90%. Under the reference scale used here, that is an A-.
42 divided by 50 equals 84%, which is a B on the reference scale.
It depends on the number of questions. For example, on a 20-question test you need at least 18 correct; on a 100-question test you need at least 90 correct.
If it earns zero points, it has the same effect on the percentage as a wrong answer. Some tests may use special scoring rules, so check the instructions.
Use points earned and points possible rather than counting questions. The Percentage Grade Calculator is useful for that situation.
No. A test is one assessment. Your course grade may combine many assessments with different weights.
Yes. It works for quizzes, tests, exams, and other equally weighted question sets.
On a short assessment, each question represents a larger percentage of the total. A 10-question test changes by 10 percentage points per question, while a 100-question test changes by 1 point.
It uses the displayed A+–F reference scale. Always compare the result with your instructor's syllabus if their thresholds differ.