20 questions, 3 wrong
Input
Total 20, wrong 3Output
85%, letter B17 ÷ 20 × 100 = 85. On the default scale, 85 is a B because A starts at 90.
Quiz Grade Calculator
Score a quiz from the questions you missed. See the percent, the letter on your scale, how many you can still miss, and the full easy grader chart for tests up to 100 questions.
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Quiz grade calculator
How many questions can you miss?
These tables use the default scale: A 90, B 80, C 70, D 60. Change the scale in the calculator above if your class uses different cuts. Each missed question costs 100 divided by the number of questions.
| Questions | Each miss | Misses for an A | Misses for a B | Misses for a C | Misses for a D |
|---|---|---|---|---|---|
| 10 | 10 pts | 1 | 2 | 3 | 4 |
| 20 | 5 pts | 2 | 4 | 6 | 8 |
| 25 | 4 pts | 2 | 5 | 7 | 10 |
| 50 | 2 pts | 5 | 10 | 15 | 20 |
10-question easy grader chart
Each question is worth 10 points on this 10-question quiz.
| Wrong | Correct | Score | Letter |
|---|---|---|---|
| 0 | 10 | 100% | A |
| 1 | 9 | 90% | A |
| 2 | 8 | 80% | B |
| 3 | 7 | 70% | C |
| 4 | 6 | 60% | D |
| 5 | 5 | 50% | F |
| 6 | 4 | 40% | F |
| 7 | 3 | 30% | F |
| 8 | 2 | 20% | F |
| 9 | 1 | 10% | F |
| 10 | 0 | 0% | F |
20-question easy grader chart
Each question is worth 5 points on this 20-question quiz.
| Wrong | Correct | Score | Letter |
|---|---|---|---|
| 0 | 20 | 100% | A |
| 1 | 19 | 95% | A |
| 2 | 18 | 90% | A |
| 3 | 17 | 85% | B |
| 4 | 16 | 80% | B |
| 5 | 15 | 75% | C |
| 6 | 14 | 70% | C |
| 7 | 13 | 65% | D |
| 8 | 12 | 60% | D |
| 9 | 11 | 55% | F |
| 10 | 10 | 50% | F |
| 11 | 9 | 45% | F |
| 12 | 8 | 40% | F |
| 13 | 7 | 35% | F |
| 14 | 6 | 30% | F |
| 15 | 5 | 25% | F |
| 16 | 4 | 20% | F |
| 17 | 3 | 15% | F |
| 18 | 2 | 10% | F |
| 19 | 1 | 5% | F |
| 20 | 0 | 0% | F |
25-question easy grader chart
Each question is worth 4 points on this 25-question quiz.
| Wrong | Correct | Score | Letter |
|---|---|---|---|
| 0 | 25 | 100% | A |
| 1 | 24 | 96% | A |
| 2 | 23 | 92% | A |
| 3 | 22 | 88% | B |
| 4 | 21 | 84% | B |
| 5 | 20 | 80% | B |
| 6 | 19 | 76% | C |
| 7 | 18 | 72% | C |
| 8 | 17 | 68% | D |
| 9 | 16 | 64% | D |
| 10 | 15 | 60% | D |
| 11 | 14 | 56% | F |
| 12 | 13 | 52% | F |
| 13 | 12 | 48% | F |
| 14 | 11 | 44% | F |
| 15 | 10 | 40% | F |
| 16 | 9 | 36% | F |
| 17 | 8 | 32% | F |
| 18 | 7 | 28% | F |
| 19 | 6 | 24% | F |
| 20 | 5 | 20% | F |
| 21 | 4 | 16% | F |
| 22 | 3 | 12% | F |
| 23 | 2 | 8% | F |
| 24 | 1 | 4% | F |
| 25 | 0 | 0% | F |
50-question easy grader chart
Each question is worth 2 points on this 50-question quiz.
| Wrong | Correct | Score | Letter |
|---|---|---|---|
| 0 | 50 | 100% | A |
| 1 | 49 | 98% | A |
| 2 | 48 | 96% | A |
| 3 | 47 | 94% | A |
| 4 | 46 | 92% | A |
| 5 | 45 | 90% | A |
| 6 | 44 | 88% | B |
| 7 | 43 | 86% | B |
| 8 | 42 | 84% | B |
| 9 | 41 | 82% | B |
| 10 | 40 | 80% | B |
| 11 | 39 | 78% | C |
| 12 | 38 | 76% | C |
| 13 | 37 | 74% | C |
| 14 | 36 | 72% | C |
| 15 | 35 | 70% | C |
| 16 | 34 | 68% | D |
| 17 | 33 | 66% | D |
| 18 | 32 | 64% | D |
| 19 | 31 | 62% | D |
| 20 | 30 | 60% | D |
| 21 | 29 | 58% | F |
| 22 | 28 | 56% | F |
| 23 | 27 | 54% | F |
| 24 | 26 | 52% | F |
| 25 | 25 | 50% | F |
| 26 | 24 | 48% | F |
| 27 | 23 | 46% | F |
| 28 | 22 | 44% | F |
| 29 | 21 | 42% | F |
| 30 | 20 | 40% | F |
| 31 | 19 | 38% | F |
| 32 | 18 | 36% | F |
| 33 | 17 | 34% | F |
| 34 | 16 | 32% | F |
| 35 | 15 | 30% | F |
| 36 | 14 | 28% | F |
| 37 | 13 | 26% | F |
| 38 | 12 | 24% | F |
| 39 | 11 | 22% | F |
| 40 | 10 | 20% | F |
| 41 | 9 | 18% | F |
| 42 | 8 | 16% | F |
| 43 | 7 | 14% | F |
| 44 | 6 | 12% | F |
| 45 | 5 | 10% | F |
| 46 | 4 | 8% | F |
| 47 | 3 | 6% | F |
| 48 | 2 | 4% | F |
| 49 | 1 | 2% | F |
| 50 | 0 | 0% | F |
By Muhammad Abdullah Rauf · Founder, EverydayTools.proUpdated 2026-10-24
How do you calculate a grade from wrong answers?
An easy grader turns a raw quiz into a percent and a letter. Correct answers are total questions minus wrong answers. The score is that correct count divided by the total, times 100. The letter comes from the scale on the page. The default scale is A at 90, B at 80, C at 70, D at 60, and F below 60. Change those minimums if the class uses a different cut.
Wrong-answer score formula
Correct answers are calculated, not typed. The percent is exact. The letter is the highest band whose minimum is less than or equal to that percent.
Formula
Correct = Total − Wrong
Score = Correct ÷ Total × 100Assumptions
- Questions and wrong answers are whole numbers.
- Each question has the same weight.
- The default letter cuts are 90, 80, 70, and 60.
Limitations
- This page does not average several assignments or compute GPA.
- Partial credit, extra credit, and curved scores need a different entry.
- The live chart lists every row through 100 questions. Longer tests show letter changes and the rows near your score.
- The plus/minus preset is a common set of cuts, not a rule from your school.
How to use the grade calculator
Enter the total questions
Use the number of items on the quiz or test. The count has to be a whole number of at least 1.
Enter the wrong answers
Count only the items marked wrong. This cannot be higher than the total.
Check the letter scale
Leave the default 90/80/70/60 cuts, or type the minimum percent your class uses for A, B, C, and D.
Read the percent, letter, and chart
The chart lists wrong-answer counts. Long tests show the letter changes and the rows near your score instead of every row.
Quiz score examples
10 questions, 2 wrong
Input
Total 10, wrong 2Output
80%, letter B8 ÷ 10 × 100 = 80. Eighty meets the B minimum and is not an A.
A perfect paper
Input
Total 25, wrong 0Output
100%, letter ANo wrong answers means every question is correct.
Who uses Quiz Grade Calculator?
Common real-world scenarios where this tool saves time.
Students
Check a quiz before the grade book updates
Count the items marked wrong on a returned paper and read the percent without opening a spreadsheet.
Teachers
Show how many misses change the letter
Use the chart to show the class which wrong-answer counts still earn an A, B, C, or D on the scale you set.
Tutors
Score a short practice set
Enter the number of questions in a practice packet and the misses, then copy the percent for a session note.
Common mistakes to avoid
Typing the number correct into the wrong-answers field
The second field is misses, not correct answers. Correct answers are calculated as total minus wrong.
Treating 89 as an A on the default scale
The default A starts at 90. Eighty-nine is a B until you lower the A minimum.
Using this page for a weighted course average
Each question is equal here. Use the average grade calculator when assignments have different weights.
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Frequently Asked Questions
How do you calculate a test grade from the number wrong?
Divide the correct answers by the total questions and multiply by 100. Correct answers are the total minus the number wrong. Three wrong on a 20-question quiz is 85%.
What grade is 3 wrong out of 20?
Seventeen correct out of 20 is 85%. On the default scale that is a B, because A starts at 90.
What percent is 2 wrong out of 10?
Eight correct out of 10 is 80%.
Can I change the A, B, C, and D cutoffs?
Yes. Edit the minimum percent for each letter. F stays at 0 so every score still has a letter. The default cuts are a common US scale, not your school's official policy.
How many questions can I miss on a 20-question quiz and still get a B?
Four. Four wrong is 16 correct, and 16 ÷ 20 × 100 = 80%, the lowest B on the default scale. Five wrong is 75%, a C.
How many points is each question worth?
Divide 100 by the number of questions. A 20-question quiz gives 5 points per question. A 25-question quiz gives 4. A 40-question quiz gives 2.5.
Is this the same as the GPA calculator?
No. This page scores one quiz from a wrong-answer count. The GPA calculator turns course grades and credits into a grade point average.
Privacy, accuracy, and trust
Privacy
Question counts stay in your browser and are not uploaded.
A class curve, extra credit, or an official grade book can differ from this result.
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Reviewed on 2026-10-24.
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