Enter how many questions the quiz had and how many were missed to get the percentage and letter grade instantly, plus the full questions-wrong grading chart.
| Input | Result |
|---|---|
| 20 questions, 3 wrong | 17/20 = 85.0% (B) |
| 25 questions, 4 wrong | 21/25 = 84.0% (B) |
| 10 questions, 1 wrong | 9/10 = 90.0% (A) |
| 50 questions, 12 wrong | 38/50 = 76.0% (C) |
This is the table behind every easy grader. Find your quiz length across the top, the number of questions missed down the left, and read the grade where they meet. Values are computed exactly — no rounded shortcuts.
| Missed | 10 questions | 15 questions | 20 questions | 25 questions | 30 questions | 40 questions | 50 questions |
|---|---|---|---|---|---|---|---|
| 0 wrong | 100.0% A | 100.0% A | 100.0% A | 100.0% A | 100.0% A | 100.0% A | 100.0% A |
| 1 wrong | 90.0% A | 93.3% A | 95.0% A | 96.0% A | 96.7% A | 97.5% A | 98.0% A |
| 2 wrong | 80.0% B | 86.7% B | 90.0% A | 92.0% A | 93.3% A | 95.0% A | 96.0% A |
| 3 wrong | 70.0% C | 80.0% B | 85.0% B | 88.0% B | 90.0% A | 92.5% A | 94.0% A |
| 4 wrong | 60.0% D | 73.3% C | 80.0% B | 84.0% B | 86.7% B | 90.0% A | 92.0% A |
| 5 wrong | 50.0% F | 66.7% D | 75.0% C | 80.0% B | 83.3% B | 87.5% B | 90.0% A |
| 6 wrong | 40.0% F | 60.0% D | 70.0% C | 76.0% C | 80.0% B | 85.0% B | 88.0% B |
| 7 wrong | 30.0% F | 53.3% F | 65.0% D | 72.0% C | 76.7% C | 82.5% B | 86.0% B |
| 8 wrong | 20.0% F | 46.7% F | 60.0% D | 68.0% D | 73.3% C | 80.0% B | 84.0% B |
| 9 wrong | 10.0% F | 40.0% F | 55.0% F | 64.0% D | 70.0% C | 77.5% C | 82.0% B |
| 10 wrong | 0.0% F | 33.3% F | 50.0% F | 60.0% D | 66.7% D | 75.0% C | 80.0% B |
| 11 wrong | — | 26.7% F | 45.0% F | 56.0% F | 63.3% D | 72.5% C | 78.0% C |
| 12 wrong | — | 20.0% F | 40.0% F | 52.0% F | 60.0% D | 70.0% C | 76.0% C |
An "easy grader" exists because grading a 27-question quiz by hand is genuinely error-prone. Dividing 24 by 27 in your head is not the hard part — the hard part is the boundary: 23/27 is 85.2% (B) and 24/27 is 88.9% (B), but 25/27 jumps to 92.6% (A). One question can move a student a whole letter, so teachers (and students checking their own work) use a lookup table instead of arithmetic.
The calculation is a plain proportion: the questions you got right, divided by the questions that existed, times 100. Wrong answers are simply subtracted — there is no penalty beyond the point lost, which is why "wrong" and "missing" produce the same result. So 3 wrong out of 20 is identical in grade terms to leaving 3 blank.
Almost every school publishes a rounding rule, and it decides whether an 89.4% becomes a B+ or an A−. The two policies you will meet:
| Policy | What happens to 89.4% | What happens to 89.5% |
|---|---|---|
| Round half up (most common) | 89% → B | 90% → A |
| Truncate / always round down | 89% → B | 89% → B |
| Round to nearest whole, no half-up | 89% → B | 90% → A only if the school treats .5 as up |
If your score lands on a boundary, check your syllabus before assuming anything — a single point at 89.4% versus 89.5% is the most common grade dispute in middle and high school.
Percentages are convenient for quick quizzes, but most secondary and university courses run on points, not percentages. A 20-point quiz and a 200-point exam both convert to the same percentage, but the 200-point one moves your course average far more. If your grades are already recorded as percentages and you need the course total, use the grade calculator or the weighted grade calculator instead.
Enter two numbers: how many questions were on the quiz or test, and how many were answered incorrectly. The calculator returns your score as a fraction, as a percentage, and as a letter grade — the same result a printed easy grader chart would give you.
Functionally yes. An easy grader asks for questions wrong, while a test grade calculator asks for points earned and points possible. Both produce the same percentage — pick whichever matches the numbers you already have.
17 out of 20 is 85.0%, a B on the standard 10-point scale and a solid B with plus/minus grading. Two wrong would be 90.0% (A), and four wrong would be 80.0% (B).
No. Only the point for that question is lost — there is no additional deduction for choosing the wrong option, which is why guessing on a question you do not know never lowers a score below leaving it blank on a standard percentage-based test.
Enter any total. The chart below covers 10, 15, 20, 25, 30, 40 and 50 questions; the calculator itself accepts any number, including odd totals like 23 or 37, which you will see on unit tests and finals.
Because each question is worth a bigger slice of a small total. On a 10-question quiz each question is worth 10 percentage points, on a 20-question quiz 5 points, and on a 50-question quiz only 2. That is why a short quiz grade is noisier than an exam grade.