EZ Grader & Test Grade Calculator: Score to Grade
Type the total questions and how many were wrong — get the percentage and letter grade instantly, plus a full printable grading chart.
Grade a test
Match this to your school policy — it decides borderline cases like 89.6%.
How it works: the formula and method
Percentage = (Total − Wrong) ÷ Total × 100. The percentage is then matched to a letter grade on the scale you choose: the standard 10-point scale (90–100 = A, 80–89 = B…) or a plus/minus scale (93–100 = A, 90–92 = A−, 87–89 = B+…). This is the same sliding-scale idea as the classic cardboard EZ Grader wheel.
How to use this calculator
- Enter the total number of questions on the test.
- Enter how many the student got wrong (half points are allowed, e.g. 2.5).
- Pick your grading scale and rounding policy to match your school.
- Read off the percentage and letter grade — or print the full chart for the whole stack of papers.
Worked examples
Example 1 — grading a quiz
A 20-question quiz with 3 wrong: (20 − 3) ÷ 20 × 100 = 85%, a B on the standard scale.
Example 2 — why rounding matters
On a 250-question exam, 26 wrong gives 89.6%. With rounding off that is a B; with rounding to the nearest whole percent it becomes 90% — an A. Neither is 'wrong'; your school policy decides, so the calculator makes the setting visible.
Frequently asked questions
How does an EZ grader work?
It subtracts the number wrong from the total, divides by the total and multiplies by 100. That percentage is then matched to a letter grade on your chosen scale.
Which grading scale should I use?
Most US schools use the standard 10-point scale (90–100 = A). If your school awards A−, B+ and so on, choose the plus/minus scale.
What does the rounding setting do?
With rounding on, 89.6% becomes 90% and earns an A. With rounding off, the exact percentage is used and 89.6% stays a B. Set it to match your school or department policy.
Can I grade with half points?
Yes. Enter wrong answers in half-point steps, for example 2.5 wrong on a 20-question test, and the percentage is calculated exactly.