Test Score Calculator
Enter how many questions were on the test and how many you got wrong to see your score.
A test score calculator works from the number you actually know after a test comes back: how many questions you missed. Subtract the wrong answers from the total to get the number right, divide by the total, and multiply by 100. Missing 7 on a 40 question test leaves 33 right, and 33 ÷ 40 × 100 = 82.5%, a B- on the standard scale.
This calculator assumes every question is worth the same and uses a common US letter scale (A- from 90, B- from 80, C- from 70, D- from 60). Your teacher or school may value some questions more than others, curve the results, give partial credit, or use other cutoffs, so the grade they record is the one that counts. It is not an official grade and not a substitute for your teacher's gradebook; treat it as a way to check your own math.
Test score
82.5% · B-
- Correct answers
- 33 of 40
- Each question is worth
- 2.5 points
- Points lost to wrong answers
- 17.5
- Letter grade
- B-
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About the Test Score Calculator
Most tests come back marked with what you got wrong, not with a percentage, so this calculator starts there. Put in the number of questions and the number you missed, including any you left blank, and it counts the questions you got right, turns that into a percentage, and maps the percentage to a letter. It also shows what each question was worth, which is the figure students tend to want before the test rather than after. On a 40 question test every question is worth 100 ÷ 40 = 2.5 points, so 7 wrong answers cost 7 × 2.5 = 17.5 points. On a 25 question quiz each one is worth 4 points, and missing 3 leaves 88%. The shorter the test, the more a single mistake moves the score: one miss on a 10 question quiz drops you to 90%, while one miss on a 50 question exam only drops you to 98%. The letter uses common US cutoffs with plus and minus bands, where a B- starts at 80 and an A- at 90. It assumes every question counts the same. If your test mixes a few long answers worth more with many short ones, add up the points instead and use the grading calculator in this hub, which takes points earned and points possible.
Frequently asked questions
How do I calculate my test score from the number I got wrong?+
Subtract the number wrong from the total number of questions to get the number right, then divide by the total and multiply by 100. On a 40 question test with 7 wrong, 33 ÷ 40 × 100 = 82.5%.
How many points is each question worth?+
When every question counts the same, each one is worth 100 divided by the number of questions. That is 2.5 points on a 40 question test, 4 points on a 25 question quiz, and 10 points on a 10 question quiz.
How many questions can I miss and still get a 90?+
Divide the number of questions by 10 and round down. On a 40 question test that is 4 misses, which leaves 36 ÷ 40 × 100 = 90%. A fifth miss drops you to 35 ÷ 40 × 100 = 87.5%, which is a B+.
Do blank answers count as wrong?+
On a test scored by the number right, a skipped question earns nothing, so count it as wrong here. Some standardized tests used to subtract a fraction of a point for each wrong guess but not for a blank. This calculator does not apply any guessing penalty.
What if some questions are worth more than others?+
Then the count of wrong answers is not enough, because missing a 10 point essay costs more than missing a 2 point multiple choice question. Add up the points you earned and the points possible, and use the grading calculator in the education hub instead.
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