What is an easy grader (EZ grader)?
An easy grader, also called an EZ grader, is a chart that shows the percentage and letter grade for every number of wrong answers on a test. Teachers used to buy it as a cardboard slide chart. This online version works the same way: set the number of questions and read the grade for each paper. It is free, needs no sign-up, and works for quizzes, tests and exams.
An online grader for a stack of tests
Set the number of questions once, then use the grading chart to look up each paper by its wrong-answer count. The free online easy grader shows both the percentage score and letter grade, with no signup required. Teachers can print the chart; students can check a test or quiz result. Use the points calculator instead when questions carry different marks. It works as a simple teacher grader: no account, no class roster, and nothing is sent to our server.
How to use the easy grader for a test or quiz
- Enter the total number of equally weighted questions.
- Choose correct answers or wrong answers, then enter the count.
- Read the test percentage and the letter grade together.
- Match the grade scale and passing threshold to your school policy.
- Use the complete grading chart to mark more papers, or print it for your desk.
- Teachers who used a paper EZ grader slide chart can use this the same way: set the number of questions, then read the grade for each number wrong.
Scoring test calculator formula
Percentage = (Correct answers ÷ Total questions) × 100
How many questions can you miss and still get an A?
| Questions | Most wrong for an A (90%) | For a B (80%) | For a C (70%) | To pass (60%) |
|---|---|---|---|---|
| 10 | 1 | 2 | 3 | 4 |
| 15 | 1 | 3 | 4 | 6 |
| 20 | 2 | 4 | 6 | 8 |
| 25 | 2 | 5 | 7 | 10 |
| 30 | 3 | 6 | 9 | 12 |
| 40 | 4 | 8 | 12 | 16 |
| 50 | 5 | 10 | 15 | 20 |
| 100 | 10 | 20 | 30 | 40 |
Exam grade calculator for midterms and finals
Use it as an exam grade calculator for any multiple-choice or one-mark-per-question exam: set the number of questions, count the wrong answers and read the percentage and letter. As a teacher grade calculator it keeps the same settings for every paper, which makes it an easy grading calculator for a full class set. When questions carry different marks, the online grader calculator for points is the points grade calculator.
An example: 18 out of 20
18 correct answers out of 20 questions gives 18 ÷ 20 × 100 = 90%. With the default boundaries, that is an A. Changing your school’s boundaries can change the letter, but never the percentage.
Use your school’s grading scale
The default A–F scale uses 90, 80, 70 and 60 as minimum percentages. Schools can use different thresholds. Letter grades use the full unrounded percentage; displayed rounding does not change the grade.
Grading scales you can use
- Standard A–F: A 90, B 80, C 70, D 60. Most US schools use this.
- Plus/minus: A+ 97, A 93, A− 90 and so on down to D− 60.
- 7-point scale: A 93, B 85, C 77, D 70, used by some districts and colleges.
- Lenient scale: A 85, B 75, C 65, D 55, used by some teachers for a hard test.
- Custom: type any minimum for each letter in Grade scale, then save it for next time.
Calculator for test grades: common scores
| Correct / total | Wrong answers | Percentage | Default letter |
|---|---|---|---|
| 12 / 15 | 3 | 80% | B |
| 15 / 20 | 5 | 75% | C |
| 16 / 20 | 4 | 80% | B |
| 18 / 20 | 2 | 90% | A |
| 11 / 15 | 4 | 73.33% | C |
Grading charts for common test lengths
Below the calculator, the quick links open a full grading chart for 10, 12, 15, 16, 20, 25, 30, 40 and 50 questions. Each chart lists every score from all correct to all wrong, with the percentage and letter, and prints on one page.
A quick score calculator for tests and quizzes
It also works as a quiz grade calculator. This easy grader assumes every question has the same value and answers are counted as whole correct or wrong responses. For partial marks or questions worth different points, use the points grade calculator. For homework, quizzes and exams with different course weights, use the weighted grade calculator.
Before you record a grade
- Check that correct answers plus wrong answers equal the total questions.
- Use the exact percentage when comparing it with a grade boundary.
- Do not mistake the displayed rounding for your institution’s rounding policy.
- Confirm whether missing work counts as zero or is excluded.
- Save only settings you want stored in this browser; review inputs before sharing a link.
Inputs, units and valid ranges
| Variable | Meaning | Accepted values |
|---|---|---|
| N | Total equally weighted questions | Whole number from 1 to 10,000 |
| C | Correct answers | Whole number from 0 to N |
| W | Wrong answers | N − C |
| p | Percentage score | 100 × C ÷ N |
| T | Passing threshold | Percentage from 0 to 100 |
Why a rounded score can still be below a boundary
For 26 correct answers out of 29, the percentage is 100 × 26 ÷ 29 = 89.655172…%. A whole-number display may show 90%, but the unrounded score is below an A boundary of 90%. This calculator assigns the letter and pass status from the unrounded value. Change a boundary only when your grading policy requires it; display precision does not change the underlying result.
Key terms explained
- Percentage
- Correct answers as a share of all questions, multiplied by 100.
- Grade boundary
- The minimum unrounded percentage for a letter.
- Passing score
- Your selected threshold for a passing result.
References and calculation notes
These references explain the underlying mathematics or policy context. Use your institution’s or provider’s rules for official decisions.