Test Score Percentage Calculator
Enter how many questions you answered correctly and how many there were. You get your percentage, a letter grade, and the number of correct answers needed for 90% and 80%.
Your numbers
How we calculate it
Percent correct = correct answers ÷ total questions × 100. The number needed for a target is the target percent of the total, rounded up to a whole question: needed = ⌈total × target ÷ 100⌉.
With 42 of 50 correct, the score is 84%, which is a B. You would have needed 45 correct for 90% and 40 for 80%, and you missed 8 questions.
Assumptions and limits
- The letter grade uses a common US scale: A from 90, B from 80, C from 70, D from 60 and F below 60. Your teacher may use a different scale.
- Both numbers must be whole numbers, and you cannot have more correct answers than questions.
- Tests with partial credit or weighted questions are not covered. Use the weighted grade calculator for weighted work.
Frequently asked questions
How do I calculate a test score percentage?
Divide the number of correct answers by the total number of questions and multiply by 100. 42 out of 50 is 42 ÷ 50 × 100 = 84%.
How many questions do I need right for a 90%?
Multiply the total by 0.9 and round up. On a 50 question test you need 45 correct. On a 30 question test you need 27.
Why is the number needed always rounded up?
You cannot answer part of a question, and rounding down would leave you slightly under the target. On a 7 question test 90% needs 6.3, so you need 7 right.
Related calculators
- Weighted Grade CalculatorEnter your scores and, in the same order, how much each one counts.
- Final Grade CalculatorEnter your current grade, the grade you want and how much the final counts toward the course grade to see the exact score needed.
- GPA CalculatorChoose the letter grade and credit hours for each course to calculate your semester or cumulative GPA on the standard 4.0 scale.
- Percentage CalculatorThree common percentage problems in one place.
Worked example (a fixed example using the starting numbers, it does not change as you type)
Inputs: Questions answered correctly = 42; Total questions = 50.
- Percent correct 84%
- Letter grade B
- Correct answers needed for 90% 45
- Correct answers needed for 80% 40
- Questions missed 8
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