Quick answer
Divide the number of correct answers by the total number of questions and multiply by 100. With 42 right out of 50 the score is 84%, which the calculator also shows as a B, with 8 questions incorrect.
Enter what you got right and how many questions there were. The calculator returns the percentage, the number you missed and the letter grade it corresponds to. Use it for any test, quiz or exam score.
Related tools: Z-Score Calculator: Standardize a value using a mean and standard deviation. Percentage Calculator: Calculate a percentage of a number, what percent one number is of another, or the whole from a part. Percentage of a Percentage Calculator: Find X% of Y%, optionally applied to a base amount.
How to use the Test Score Percentage Calculator
- Enter correct answers (a whole number, 0 or more).
- Enter total questions (a whole number, 1 or more).
- Press Calculate to see the result, and use Reset to start again.
| Input | What to enter | Allowed values |
|---|---|---|
| Correct answers | A whole number | ≥ 0 |
| Total questions | A whole number | ≥ 1 |
Formula and method
Formula
score % = correct ÷ total × 100
Rounded to 2 decimal places for GPA, 2 for percentages.
Correct answers cannot exceed the total.
Worked examples
These examples are verified: each one is an automated test case that the live calculator must reproduce exactly.
Example 1
Inputs: Correct answers = 42; Total questions = 50.
| Result | Value |
|---|---|
| Score | 84% |
| Letter grade | B |
| Incorrect | 8 |
Example 2
Inputs: Correct answers = 0; Total questions = 20.
| Result | Value |
|---|---|
| Score | 0% |
| Letter grade | F |
| Incorrect | 20 |
The first line is the headline result (score). Below it the test Score Percentage Calculator lists letter grade and incorrect, which describe the same case from other angles. Rounded to 2 decimal places for GPA, 2 for percentages.
The calculation
Score % = correct ÷ total × 100. For 42 of 50 that is 0.84 × 100 = 84%. If a test has partial credit or points of unequal value, divide points earned by points possible instead of counting questions.
Letter grades are a convention
The letter shown follows a common 90/80/70/60 scheme, but teachers set their own cut-offs, and a few round up borderline scores. Treat the letter as an estimate and confirm your instructor's scale in the syllabus.
How the result changes with total questions
Holding every other input at the first worked example, this table changes only total questions. It shows how sensitive the answer is to that one value; each row was produced by running this calculator.
| Total questions | Score | Letter grade | Incorrect |
|---|---|---|---|
| 50 | 84% | B | 8 |
| 100 | 42% | F | 58 |
| 200 | 21% | F | 158 |
What happens with invalid input
These messages are produced by the calculator itself, so you know what to fix.
- Correct answers: entering "11" shows "Correct answers cannot exceed the total." beside that field and no result.
Choosing between the Test Score Percentage Calculator and similar calculators
Each row shows what a related calculator on this site asks for and what it returns, so you can pick the one that matches your question.
| Calculator | You enter | It returns |
|---|---|---|
| [Z-Score Calculator](/statistics/z-score-calculator/) | value, mean and standard deviation | Z-score |
| [Percentage Calculator](/math/percentage-calculator/) | what do you want to find?, a and b | 15% of 200 |
| [Percentage of a Percentage Calculator](/math/percentage-of-a-percentage-calculator/) | x and y | Result |
| [Percentage Change Calculator](/math/percentage-change-calculator/) | old value and new value | Percentage change |
| [Winning Percentage Calculator](/fitness/winning-percentage/) | wins, losses and ties count as | Winning percentage |
Assumptions and limitations
- Correct ≤ total
If a required value is empty, not a number, or outside its allowed range, the form marks that field with a message and shows no result instead of a misleading number. The automated checks deliberately try invalid entries for correct answers to confirm this.
Frequently asked questions
What percentage is 42 out of 50?
42 out of 50 is 84%, because 42 divided by 50 is 0.84.
How do I handle negative marking?
Subtract the penalty from your correct answers first, then enter the adjusted score as the number correct.
Can the score exceed 100%?
Not with this calculator: correct answers cannot be more than the total questions, and it will say so.
What does the Test Score Percentage Calculator calculate?
Percentage score from correct answers out of total questions. It returns Score, Letter grade and Incorrect.
What formula does the Test Score Percentage Calculator use?
score % = correct ÷ total × 100. Correct answers cannot exceed the total.
What do I need to enter in the test Score Percentage Calculator?
You enter Correct answers and Total questions.
How is the result rounded or limited?
Rounded to 2 decimal places for GPA, 2 for percentages. Correct ≤ total.
What is an example of a test Score Percentage result?
With correct answers 42 and total questions 50, the score is 84%.
Related calculators
- Z-Score Calculator — Standardize a value using a mean and standard deviation.
- Percentage Calculator — Calculate a percentage of a number, what percent one number is of another, or the whole from a part.
- Percentage of a Percentage Calculator — Find X% of Y%, optionally applied to a base amount.
- Percentage Change Calculator — Find the percentage increase or decrease from an old value to a new value.
- Winning Percentage Calculator — Winning percentage from wins, losses and ties.
- Ratio Percentage Calculator — Percentage share of each part of a ratio.
Sources
- Common US 4.0 unweighted grading convention; institutions may differ, so confirm with your school's registrar
Content last reviewed 2026-11-04. Formulas and worked examples are checked by automated tests against independently computed values.