Easy Grader
Set the number of questions once, then type how many are wrong. The score updates as you type — no button to press, and the full grading chart is right there to print.
Change this for each paper — the question count stays put.
Score
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Grade
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Correct
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Full grading chart
Every possible score on this test. Print it and keep it beside you.
| Wrong | Correct | Score | Grade |
|---|---|---|---|
Sign in or create a free account to save this calculation. Everything else works without one.
Related calculators
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Generate and print a full grading chart for any number of questions, with thresholds you control.
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Turn correct or wrong answers out of a total into a percentage and letter grade.
Grade Calculator
Add up points earned and points possible across assignments to get your course percentage and letter grade.
How to use this calculator
- Set the number of questions on the test. You only do this once for the whole stack.
- Type how many the student got wrong. The score appears immediately.
- For the next paper, change only the number wrong.
If you would rather not type at all, print the chart and read the score straight off it. That is usually faster once you are past a handful of papers.
How the calculation works
Every question is worth the same share of the test. Subtract the wrong answers from the total, divide by the total, and multiply by 100.
On a 20-question test each question is worth 5%, so 3 wrong gives 17 ÷ 20 = 85%. On a 30-question test each is worth 3.33%, and 3 wrong gives 90%. The same number of mistakes means different grades on different tests, which is the thing a chart makes obvious at a glance.
A worked example
A 25-question quiz with 4 wrong:
- Correct: 25 − 4 = 21
- Score: 21 ÷ 25 = 0.84, so 84%
- On a standard scale that is a B
Each question on a 25-question test is worth 4%, so the next mistake would take that student to 80% — still a B-, but only just. The chart above shows every one of those steps without you having to work them out.
What each question is worth
Test length changes how much a single mistake costs. This is worth knowing when you are designing a quiz as much as when you are marking one:
| Questions | Each is worth | One wrong | Two wrong | Three wrong |
|---|---|---|---|---|
| 5 | 20% | 80% | 60% | 40% |
| 10 | 10% | 90% | 80% | 70% |
| 20 | 5% | 95% | 90% | 85% |
| 25 | 4% | 96% | 92% | 88% |
| 50 | 2% | 98% | 96% | 94% |
On a five-question quiz a single mistake is the difference between an A and a B-. On a fifty-question test it barely registers. Short quizzes grade in very coarse steps.
Important notes and limitations
Letter grades depend on your scale
The percentage is simple arithmetic and will not vary. The letter beside it depends on where your school sets its cut-offs, which differ widely. Switch the grading scale above to match yours.
- Whole questions only. For part marks or differently weighted questions, use the Grade Calculator.
- Up to 200 questions. Beyond that the chart stops being something you can read.
- Curves and dropped questions are applied afterwards and are not modelled here.
Frequently asked questions
How do I use an easy grader?
Enter the number of questions on the test once, then type how many a student got wrong. The score appears immediately. For the next paper you only change the second number — the question count stays where it is.
Can I print the grading chart?
Yes. Press Print and the chart comes out on its own, without the site navigation around it. Pinning it next to you is usually faster than typing each paper in.
What if my test has half-point questions?
This grader works in whole questions. For part marks, add up the points and use the Grade Calculator instead, which takes points earned out of points possible.
Why does my school's letter grade differ?
Because percentage cut-offs vary. Switch the grading scale above to match yours — the percentage will not change, but the letter beside it will.
Is this the same as an EZ Grader wheel?
Same idea, same arithmetic. The paper wheel and this both convert "questions wrong out of total" into a percentage; this one also shows the whole chart at once and lets you set your own grading scale.