How many questions can I miss on a 10-question quiz and still get an A?

One. Each question is worth 10%, so 9 out of 10 is 90%, exactly the A cutoff on the standard scale, and 8 out of 10 is 80%, a B. Short quizzes leave almost no room: a single additional miss drops a full letter.

Do quizzes count as much as tests?

Almost never. A syllabus usually weights quizzes far below tests — for example, all quizzes together might be worth 20% of the course grade while tests are worth 50%. To see how a quiz score moves your course grade, enter it as a category in the category grade calculator.

How do I handle half credit on a quiz?

Enter each half-credit answer as 0.5 missed. Two half-credit answers equal one full miss. Add the partial amounts together first: three half-credit answers are 1.5 missed, and the percent is computed from that total, not from 3.

What is a good quiz score?

There is no universal number: it depends on your scale and on how the quiz is weighted. As a rough guide, 90% and above is an A, 80–89% a B, and 70–79% a C on the standard scale. A single low quiz matters less than the pattern across the term, especially if your syllabus drops the lowest one.

Quiz grade calculator

Quiz Grade Calculator

Enter questions and missesAny quiz size, halves allowed.
See the percent and letter gradePlus the miss allowance table.
Check what one more miss costsBefore the next quiz.

By Muhammad Mansoor Haidar, owner and developer · Last updated October 25, 2026

Questions on the quiz

Questions missed

17 correct out of 20 questions

85% · B

Each question is worth 5% on a 20-question quiz.

Grade	Needs at least	Most questions you can miss	Score at that limit
A	90%	2	90%
B	80%	4	80%
C	70%	6	70%
D	60%	8	60%

Half credit counts as half a missed question: enter 0.5 for one half-credit miss. Your teacher’s scale and rounding rule decide the official grade.

How a quiz grade is worked out

Count the correct answers, divide by the number of questions, and multiply by 100. On a 20-question quiz with 3 wrong, that is 17 ÷ 20 × 100 = 85%. The letter then comes from your scale: 85% is a B on the standard scale and a B on the plus/minus scale too.

The same division gives the value of one question: 100 ÷ number of questions. On a 20-question quiz each question is worth 5 points; on a 10-question quiz each is worth 10. That single number explains why short quizzes feel so unforgiving.

How many can I miss for each grade?

The allowance table under the calculator answers this for every boundary at once. The rule behind it is simple: the most questions you can miss for a grade is the largest whole number of misses that still keeps the score at or above that grade’s cutoff.

On a 20-question quiz the allowances are: A, at most 2 wrong; B, at most 4; C, at most 6; D, at most 8. Change the quiz size above and the whole table recomputes.

Why small quizzes swing grades

A quiz grade is a coarse measurement: with only 10 questions there are just 11 possible scores, and each miss moves the result a full letter step in places. Two students who both understand most of the material can land a full grade apart on one unlucky question.

Teachers handle this by weighting quizzes lightly, dropping the lowest quiz, or averaging several quizzes before the score counts. If your syllabus drops a lowest score, average the rest first and grade that average — grading each quiz separately and then dropping one gives the same result only when every quiz has the same number of questions.

Partial credit on quizzes

A half-credit answer is half a miss: enter 0.5 in the missed field for each question that earned half marks. Two half-credit answers equal one full miss, and the percent follows the same division as always.

If your teacher awards partial credit per question rather than per quiz, add the partial points together first. Three questions at half credit each are 1.5 missed, not 3 — entering 3 would understate the score by a full question’s value.

Worked example: 3 wrong on a 20-question quiz

A 20-question quiz with 3 wrong answers, graded on the standard scale.

Correct answers: 17 of 20
Percentage: 85%
Letter grade: B
Each question worth: 5%
Most misses still an A: 2 wrong (90%)

Three misses on a 20-question quiz cost 15 points, landing at 85% — a B. One fewer miss would have reached 90% and an A.

Charts and examples: Quiz Grade Calculator

Worked example for the quiz grade calculator: Correct answers 17 of 20, Percentage 85%, Letter grade B, Each question worth 5%, Most misses still an A 2 wrong (90%). — Worked example: Worked example: 3 wrong on a 20-question quiz

Checklist of key points for the quiz grade calculator: Percent and letter grade from questions and misses, Miss allowance for every grade boundary, Per-question value shown for any quiz size, Standard and plus/minus scales, Half-credit mis… — Key points: Quiz Grade Calculator

Map linking the quiz grade calculator to related calculators: Test grade calculator, Grading scale charts, How many can I miss, Category grade calculator, Weighted grade calculator. — Related tools for the quiz grade calculator

Quiz grade FAQs

Quiz grade questions

How quiz scores are computed, what each miss costs, and how partial credit works.

Count the wrong answers, subtract from the number of questions, divide by the number of questions and multiply by 100. On a 20-question quiz, 3 wrong is 17 ÷ 20 × 100 = 85%. The calculator above does the same step and adds the letter grade and the miss allowance table.

17 out of 20 is 85%, which is a B on the standard A–F scale and a B on the plus/minus scale. Each question on that quiz is worth 5%, so one more correct answer would have been 90% and an A.

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