The classic EZ Grader chart in printable form: print the grading table for 10, 15, 20, 25, 30, 40 and 50 questions, or run a quick check with the built-in calculator.
| Input | Result |
|---|---|
| 20 questions, 3 wrong | 17/20 = 85.0% (B) |
| 25 questions, 5 wrong | 20/25 = 80.0% (B) |
| 30 questions, 6 wrong | 24/30 = 80.0% (B) |
| 10 questions, 0 wrong | 10/10 = 100.0% (A) |
The original EZ Grader is a cardboard slide chart: you line up the number of questions with the number missed and read the grade through a window. It saved teachers from doing the division 30 times a night. These tables are the same thing in printable form — one table per common quiz length, correct to a tenth of a percent.
| Missed | 10 questions | 15 questions | 20 questions |
|---|---|---|---|
| 0 wrong | 100.0% A | 100.0% A | 100.0% A |
| 1 wrong | 90.0% A | 93.3% A | 95.0% A |
| 2 wrong | 80.0% B | 86.7% B | 90.0% A |
| 3 wrong | 70.0% C | 80.0% B | 85.0% B |
| 4 wrong | 60.0% D | 73.3% C | 80.0% B |
| 5 wrong | 50.0% F | 66.7% D | 75.0% C |
| 6 wrong | 40.0% F | 60.0% D | 70.0% C |
| Missed | 25 questions | 30 questions | 40 questions |
|---|---|---|---|
| 0 wrong | 100.0% A | 100.0% A | 100.0% A |
| 1 wrong | 96.0% A | 96.7% A | 97.5% A |
| 2 wrong | 92.0% A | 93.3% A | 95.0% A |
| 3 wrong | 88.0% B | 90.0% A | 92.5% A |
| 4 wrong | 84.0% B | 86.7% B | 90.0% A |
| 5 wrong | 80.0% B | 83.3% B | 87.5% B |
| 6 wrong | 76.0% C | 80.0% B | 85.0% B |
| 7 wrong | 72.0% C | 76.7% C | 82.5% B |
| 8 wrong | 68.0% D | 73.3% C | 80.0% B |
| Missed | 50 questions |
|---|---|
| 0 wrong | 100.0% A |
| 1 wrong | 98.0% A |
| 2 wrong | 96.0% A |
| 3 wrong | 94.0% A |
| 4 wrong | 92.0% A |
| 5 wrong | 90.0% A |
| 6 wrong | 88.0% B |
| 7 wrong | 86.0% B |
| 8 wrong | 84.0% B |
| 9 wrong | 82.0% B |
| 10 wrong | 80.0% B |
| 11 wrong | 78.0% C |
| 12 wrong | 76.0% C |
The EZ Grader is not a brand of calculator software — it is a physical grading aid sold to teachers since the 1970s, and the name has become generic the way "escalator" did. Two dials and a window: one dial for the number of questions, one for the number missed, and the grade appears in the window. Teachers keep them taped inside a desk drawer or clipped to a clipboard, because they work with no battery and no screen glare.
The reason it survived into the era of phones is speed. A slide chart gives you an answer in under a second without breaking eye contact with a stack of papers; unlocking a phone, opening a browser and typing two numbers takes ten times as long.
Every value in these charts comes from one fraction: questions correct divided by questions total, expressed as a percentage. The EZ Grader itself does not round to a whole number — it shows tenths, which matters at the boundaries. On 30 questions, 6 wrong is 80.0% (B) and 5 wrong is 83.3% (B), but 4 wrong is 86.7% — still a B without plus/minus, and a B+ with it.
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.
| Method | Best for | Weakest at |
|---|---|---|
| Printed EZ Grader chart | Paper quizzes graded in one sitting; no device needed | Totals not on the chart (a 23-question quiz); course averages |
| This page (chart + calculator) | Any total; checking a single paper; printing a fresh chart | Weighting categories or tracking a whole class |
| Spreadsheet / gradebook | Course totals, weights, multiple assignments, trends over a term | Overkill for one 10-question quiz |
If you need the course average rather than a single paper, jump to the grade calculator for a simple average or the weighted grade calculator when your syllabus assigns different weights to homework, quizzes and exams.
It is a printed grading table that converts a number of questions and a number of wrong answers into a percentage and letter grade without any arithmetic. The original version is a physical slide chart sold to teachers; this page is the same table, printable and always correct.
Find the column for the number of questions on your quiz, then follow it down to the row for the number of questions missed. The cell where they meet is the grade. For example, 20 questions and 3 missed is 85% — a B.
Yes. Use the print button above the first table, or your browser's print command. The printable version drops the navigation and keeps only the tables, so it fits on a page for a desk drawer or clipboard.
The original chart shows tenths of a percent, not whole numbers, because the boundaries matter. This page does the same, so you can see the difference between 89.9% and 90.0% rather than losing that information to rounding.
Use the calculator at the top — it accepts any total. The charts cover 10, 15, 20, 25, 30, 40 and 50 questions because those are the most common quiz lengths, not because other totals cannot be graded.
Yes — it is nothing more than the definition of a percentage applied to a quiz, so there is no policy issue. If your teacher hands back a grade that disagrees with the chart, check the rounding rule in your syllabus before assuming the grading was wrong.