Test Score Grade Calculator (EZ Grader)
Test score grader (EZ grader) — enter the number of questions and how many were wrong to get the percentage and letter grade instantly, plus a grading chart showing the grade for every number missed. Perfect for teachers and students. Runs in your browser.
Test Score Grade Calculator (EZ Grader)
How to Use the Test Score Grader
Enter total questions
Type how many questions or items the test had.
Enter the number wrong
Type how many were missed, or use the plus and minus buttons while marking.
Read the grade
See the percentage and letter grade instantly, with the matching chart row highlighted.
Use the chart
Mark a whole stack quickly by reading the grade for each number wrong off the chart.
Grading a Test at a Glance
Marking a class set of tests is one of teaching’s most repetitive chores, and for generations the humble cardboard “EZ grader” — a sliding chart that turns a number of wrong answers into a percentage — has made it bearable. This tool is the digital version, and a fraction faster. You tell it how many questions the test had and how many a student missed; it works out the score as the number correct divided by the total, converts that to a percentage, and assigns a letter grade. Crucially, it also prints a full chart showing the grade for every possible number of wrong answers, so once it is on screen you can mark an entire pile by simply reading down the column rather than recalculating each paper.
The arithmetic is deliberately simple — each question is treated as equally weighted — but it carries an insight worth dwelling on: the fewer questions a test has, the more each one is worth. On a fifty-item exam a single mistake costs two per cent and barely dents the grade, while on a ten-item quiz the same mistake costs ten per cent and can knock a student down a whole letter. The grading chart makes this visible at a glance, which is genuinely useful both for teachers setting assessments and for students gauging how much a quiz can swing their mark. It is also a quiet argument for longer assessments when fairness and stability matter.
The letter grades use the common scale where ninety and above is an A, the eighties a B, and so on down to an F below sixty, with plus and minus bands inside each. That convention is widespread but not universal — cut-offs differ between schools and countries — so the letter is best read as a sensible default to adjust to your own scheme. The same goes for the things a simple right/wrong grader cannot see: partial credit, weighted questions and grading on a curve all sit on top of the raw percentage this tool produces. For those, total the actual points and read the percentage, then apply your policy. Treated that way — as a fast, consistent calculation aid rather than the final word — it does exactly what the cardboard card always did, only quicker, and entirely in your browser so nothing you enter is uploaded.
The shorter the test, the heavier each question — on a ten-item quiz, one slip is a whole letter grade.
10 Facts About Grading Tests
Score = (correct ÷ total) × 100.
An “EZ grader” shows the grade for each number wrong.
On a 25-question test, each miss is 4%.
On a 50-question test, each miss is just 2%.
Fewer questions make each one weigh more.
Letter cut-offs (90/80/70/60) vary by school.
Curving adjusts raw scores to a desired distribution.
Partial credit changes the simple right/wrong count.
A grading chart speeds up marking a stack of tests.
This calculator runs in your browser — nothing is uploaded.
Frequently Asked Questions
- Enter the total number of questions and how many a student got wrong. The tool subtracts to find the number correct, divides by the total and multiplies by 100 for the percentage, then maps that to a letter grade. It also builds a chart showing the grade for every possible number of wrong answers, so you can mark a whole pile of papers at a glance.
- It is simply the number of correct answers divided by the total number of questions, times 100. Each question is treated as equally weighted, so on a 20-question test each one is worth five per cent, and on a 50-question test each is worth two per cent.
- Because each question is a larger slice of the whole. On a ten-question quiz, a single wrong answer costs ten per cent and can drop a grade by a whole letter, whereas on a hundred-question exam one mistake costs just one per cent. That is why short quizzes feel so unforgiving — the grading chart makes the effect obvious.
- It uses the common United States scale: 90 and above is an A, 80s a B, 70s a C, 60s a D, and below 60 an F, with plus and minus bands within each. Many schools and countries use different cut-offs, so treat the letter as a default and apply your own scheme where it differs.
- The percentage logic is identical — points earned divided by points possible. If your test is scored in points rather than a simple right/wrong count, enter the points possible as the total and convert the points lost into the “wrong” field, or simply read the percentage and ignore the per-question chart.
- A pure right/wrong grader assumes each question is fully correct or fully wrong. If you award partial credit, the simple count no longer captures it, so total up the actual points earned and possible and use those, treating the percentage as the reliable figure rather than the whole-question chart.
- Curving adjusts raw scores after the fact to fit a desired distribution — for example, shifting everyone up so the class average hits a target, or scaling to the top score. This tool gives the raw, un-curved grade; any curve is applied on top of it according to your own policy.
- When marking many papers, looking up “minus three” on a fixed chart is far faster than recalculating a percentage each time, which is exactly why physical EZ grader cards have been a teacher’s staple for decades. The chart here reproduces that, highlighting the row for the number wrong you entered.
- No — it is a calculation aid. Your institution’s exact cut-offs, rounding rules, weighting and any curve determine the official grade. Use this to mark quickly and consistently, then apply your grading policy.
- Completely free, with no account or usage limit. It runs entirely in your browser, collects no data, and works offline once the page has loaded.
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