A test score is the share of questions answered correctly, times 100. On a 20-question quiz with 3 wrong, 17 ÷ 20 × 100 = 85%, which is a B on the common plus/minus scale where 83–86% is a B. Each question on that quiz is worth 5 percentage points.
Teachers marking a stack of quizzes and students checking a returned paper both need the same quick sum: how many were right, out of how many, and what letter that becomes. Enter the number of questions and either the wrong or the correct count; the tool returns the percentage to two decimals, the letter grade on the A+ to F plus/minus scale published by the College Board, and how many percentage points a single question carries. A scale chart places the score among the grade bands so you can see how close it is to the next letter. The limit: every question is treated as equal weight. Tests with sections worth different points, partial credit or a curve need a weighted grade calculation instead, and your school's own cut-offs override the bands shown here.
Type how many questions the test had, from 1 to 10,000.
Pick Wrong answers or Correct answers, whichever you have on the paper.
Enter the number; it cannot exceed the number of questions.
The percentage, letter grade, points per question and the band chart update as you type.
Result Score: 90%
Letter grade: A-
Correct answers: 45
Wrong answers: 5
Points per question (%): 2
Exactly 90% sits at the bottom of the A- band, so one more wrong answer would drop it to a B+.
Result Score: 85%
Letter grade: B
Correct answers: 17
Wrong answers: 3
Points per question (%): 5
Each question is worth 5 points, so three misses cost 15 points and leave 85%, a B.
Result Score: 63.33%
Letter grade: F
Correct answers: 19
Wrong answers: 11
Points per question (%): 3.33
19 of 30 is 63.33%, under the 65% line for a D, so the tool flags it.
Score (%) = (N − W) ÷ N × 100
NWThe score is the correct count divided by the total, expressed as a percentage. Each question is worth 100 ÷ N points. The letter grade follows the College Board conversion table: 97–100 A+, 93–96 A, 90–92 A-, 87–89 B+, 83–86 B, 80–82 B-, 77–79 C+, 73–76 C, 70–72 C-, 67–69 D+, 65–66 D, and below 65 F. Schools differ, so treat the letter as a common reference.
100 divided by the number of questions. On a 25-question test each question is 4 points; on a 40-question test it is 2.5 points. The tool shows this value so you can see what one more correct answer would add.
On the plus/minus scale used here, 80–82% is a B-, 83–86% a B and 87–89% a B+. Many schools use a plain 80–89% band for B instead, so check the syllabus.
Multiply the number of questions by 0.10 and round down. On a 50-question test you can miss 5 and still reach exactly 90%; a sixth miss gives 88%.
Yes, for a plain percentage score an unanswered question earns nothing, so it reduces the score exactly like a wrong answer. Only tests with a guessing penalty treat blanks differently.
The bands start at whole percentages, so 89.5% falls below the 90% start of the A- band. Some teachers round up half points before assigning letters; this tool does not.
No. It scores a single test where all questions count equally. Combining tests, homework and exams with different weights needs a weighted average of each part.
Using this tool in an assignment, article or report? Copy a citation, or a link for your website.
Tools Directory Editorial Team. (2026, October 10). Test Score Calculator. Tools Directory. Retrieved October 26, 2026, from https://tools.milunir.com/education/test-scores-and-admissions/test-score-calculator/
Tools Directory Editorial Team. “Test Score Calculator.” Tools Directory, 10 Oct. 2026, https://tools.milunir.com/education/test-scores-and-admissions/test-score-calculator/. Accessed 26 Oct. 2026.
Tools Directory Editorial Team. “Test Score Calculator.” Tools Directory. Last modified October 10, 2026. Accessed October 26, 2026. https://tools.milunir.com/education/test-scores-and-admissions/test-score-calculator/.
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