Enter the maximum possible number of test items (e.g., 20, 25, 50, 100).
Enter the total number of incorrect responses.
Correct answers: 18 out of 20 questions — Outstanding performance.
Full Grading Chart for a 20-Question Test
Every possible wrong-answer count for this test, mapped to a score and letter grade — useful when grading a whole stack by hand.
| Wrong | Correct | Score % | Grade |
|---|---|---|---|
| 0 | 20 | 100.0% | A+ |
| 1 | 19 | 95.0% | A |
| 2 | 18 | 90.0% | A- |
| 3 | 17 | 85.0% | B |
| 4 | 16 | 80.0% | B- |
| 5 | 15 | 75.0% | C |
| 6 | 14 | 70.0% | C- |
| 7 | 13 | 65.0% | D |
| 8 | 12 | 60.0% | D- |
| 9 | 11 | 55.0% | F |
| 10 | 10 | 50.0% | F |
| 11 | 9 | 45.0% | F |
| 12 | 8 | 40.0% | F |
| 13 | 7 | 35.0% | F |
| 14 | 6 | 30.0% | F |
| 15 | 5 | 25.0% | F |
| 16 | 4 | 20.0% | F |
| 17 | 3 | 15.0% | F |
| 18 | 2 | 10.0% | F |
| 19 | 1 | 5.0% | F |
| 20 | 0 | 0.0% | F |
All calculations run locally in your browser — no data is uploaded or stored. Need a full-course grade instead of a single test? Try the Final Grade Calculator.
How This Teacher Grading Calculator Works
- Step 1
Enter the total number of test or quiz questions into our test score calculator.
- Step 2
Input the number of incorrect answers for your easy grader calculation.
- Step 3
Instantly view exact percentage scores and letter grades using this premier grader for teachers.
A Worked Example: Using an Easy Grader Calculator for a 25-Question Test
Numbers make this easier to trust than a formula alone. Say a teacher or student uses our test score calculator for a 25-question test with 4 incorrect answers. Here is how this grader for teachers computes the score behind the scenes:
Correct answers = 25 − 4 = 21
Percentage = (21 ÷ 25) × 100 = 84%
Letter grade for 84% = B
Advanced Test Evaluation with a Quiz Grade Calculator
Whether you are evaluating weekly pop quizzes or major midterm exams, deploying a dedicated quiz grade calculator and test grader tool streamlines academic evaluation. For full semester tracking combining homework, quizzes, and exams, make sure to utilize our Weighted Average Calculator and Final Grade Calculator.
Why Teachers and Professors Rely on an EZ Grader Calculator Every Day
Every educator knows the exhaustion of sitting at a desk late into the evening, grading stack after stack of quizzes, spelling tests, and midterm papers. Traditionally, teachers relied on laminated paper sliding charts or manual division. Not only is that process slow, but a single mental slip can result in a miscalculated grade.
This easy grader calculator and test score calculator removes that friction entirely. By instantly mapping total test items and missed answers to a percentage and letter grade, it saves hours of administrative work and ensures consistent, fair scoring across an entire classroom.
Serving as a reliable gradebook calculator for teachers, our platform guarantees accuracy, speed, and privacy, making it an indispensable asset in modern educational technology suites.
Lightning-Fast Batch Scoring
Grade an entire class set of exams in minutes using our reliable test score calculator without flipping through manual lookup charts.
Precise, Consistent Results
Exact percentage calculation on every entry via our easy grader calculator, ensuring results are defensible if a student questions their score.
A Full Academic Toolkit
Move from single-test grading to semester planning with the Final Grade Calculator and Weighted Average Calculator.
Standard Grading Scale & Percentage-to-Letter Conversion
This is the most common U.S. grading scale used by K-12 schools and universities. For a deeper breakdown, see the full Grading Scale Chart Guide.
| Letter Grade | Percentage Range | Academic Evaluation |
|---|---|---|
| A / A+ | 93% – 100% | Outstanding mastery |
| B / B+ | 83% – 92% | Above-average work |
| C / C+ | 73% – 82% | Satisfactory competence |
| D / D+ | 60% – 72% | Minimum passing standard |
| F | Below 60% | Failing / unsatisfactory |
Frequently Asked Questions
What is an EZ Grader and how does it work?
An EZ Grader (also known as an easy grader calculator or test score calculator) is an online percentage calculator for grading tests and quizzes. It subtracts wrong answers from total questions to find the correct total, divides that by the total questions, then multiplies by 100 to produce an exact percentage score and corresponding letter grade.
Is the EZ Grader and Easy Grader calculator free to use?
Yes. EZGraderCalc.com is completely free, requires no account or sign-up, and works instantly as your trusted grader for teachers in any browser on desktop or mobile.
How do I calculate a test grade with 20 questions?
Enter 20 as the total number of questions and the number answered incorrectly. The test score calculator returns the percentage and letter grade instantly — for example, 2 wrong out of 20 equals 90%, or an A-.
What is the best quiz grade calculator tool online?
EZGraderCalc.com offers the ultimate test grader tool and quiz grade calculator designed specifically to help educators process exam scores rapidly and accurately.
Does this tool store or upload student grades?
No. All calculations run locally in your browser. No test data, student names, or scores are ever transmitted or stored on a server.
How do I calculate final semester grades or weighted averages?
Use the Final Grade Calculator to find what score you need on an exam, or the Weighted Average Calculator to combine multiple assignment categories into one course grade.