ExamTally → Easy Grader
Easy Grader
Enter the number of questions and how many were missed — ExamTally stamps the percentage and letter grade instantly, with a grading chart for every score.
To grade a test, divide the number of correct answers by the total questions and multiply by 100. A 20-question test with 3 wrong is 17 correct: 17 ÷ 20 × 100 = 85%, a B on the standard scale. Enter your own numbers below to stamp the grade.
Grading chart — by items missed
| Wrong | Score | Letter |
|---|
Key takeaways
- Score = correct ÷ total × 100. Subtract wrong from total to get correct.
- 20 questions, 3 wrong → 85% → B.
- 0 wrong is always 100% → A, on any test length.
- Letters use the default US scale (A 90+, B 80+, C 70+, D 60+, F < 60).
- Confirm your school's cutoffs — pluses, minuses, and curves vary.
How the easy grader works
Every test grade is just the share of questions answered correctly, expressed as a percentage. The number wrong is subtracted from the total to find how many were right, and that count is divided by the total. Multiplying by 100 turns the fraction into a familiar percent.
Because the maths only depends on the ratio, the same wrong-answer count means a higher grade on a longer test. One wrong out of 10 is 90% (an A), but one wrong out of 5 is 80% (a B).
Worked example: 20 questions, 3 wrong
Start with 20 questions and 3 wrong. The number correct is 20 − 3 = 17. Divide: 17 ÷ 20 = 0.85, and 0.85 × 100 = 85%. On the standard scale, 85% falls in the 80–89 band, so the stamped grade is a B. Drop to 2 wrong and the score rises to 18 ÷ 20 = 90% — an A.
Standard A–F grading scale
| Letter | Percentage | GPA points (4.0) |
|---|---|---|
| A | 90–100% | 4.0 |
| B | 80–89% | 3.0 |
| C | 70–79% | 2.0 |
| D | 60–69% | 1.0 |
| F | Below 60% | 0.0 |
This is the most common US scale. Your school may use plus/minus grades or different cutoffs — always confirm.
Once you know a single test score, you can roll several together with the average grade calculator, weight them by category with the weighted grade calculator, or work out the score you need next time with the final grade calculator.
Frequently asked questions
How do you calculate a grade from questions and wrong answers?
Subtract the number wrong from the total questions to get the number correct, divide by the total, then multiply by 100. For example, 20 questions with 3 wrong is 17 correct: 17 ÷ 20 × 100 = 85%, which is a B on the standard scale.
What letter grade is each percentage?
On the default US scale: A is 90–100%, B is 80–89%, C is 70–79%, D is 60–69%, and F is below 60%. Many schools add pluses and minuses or use different cutoffs, so confirm your class’s scale.
What grade is 1 wrong out of 20?
One wrong out of 20 is 19 correct, which is 19 ÷ 20 = 95% — an A. The grading chart below the calculator shows the score and letter for every possible number missed.
Does the easy grader work for any number of questions?
Yes. It works for a 5-question pop quiz or a 200-question final the same way — the percentage is always the number correct divided by the total. The grading chart lists each missed-question step up to 20.
How is the percentage rounded?
The score is rounded to one decimal place, and whole-number results are shown without a decimal. For example 17 ÷ 20 is exactly 85%, while 5 ÷ 6 shows as 83.3%. Your teacher may round differently, so treat borderline grades as estimates.
Is this the same as a teacher’s grading chart?
It uses the same maths a printed grading chart (an "EZ Grader") uses: score equals correct over total. The difference is that letter grades depend on your school’s cutoffs, so always check the percentage against your own grading scale.
The grade calculation is mathematical: score equals correct answers divided by total questions, times 100. Letter-grade bands use the common US scale (A 90+, B 80+, C 70+, D 60+, F below 60); individual schools and districts set their own cutoffs, pluses/minuses, and rounding rules.
Last reviewed 2026-06-28