EZ Grader Calculator
Instantly convert wrong answers to percentage scores and letter grades. Perfect for teachers and students - works for any test size.
✅ Test Grader
Enter total questions and number missed
📋 Grade Results
Calculated grades for each test
| Test | Score | Percentage | Grade |
|---|
| Grade | Percentage | GPA Points | Performance |
|---|---|---|---|
| A+ | 97–100% | 4.0 | Outstanding |
| A | 93–96% | 4.0 | Excellent |
| A- | 90–92% | 3.7 | Excellent |
| B+ | 87–89% | 3.3 | Good |
| B | 83–86% | 3.0 | Good |
| B- | 80–82% | 2.7 | Good |
| C+ | 77–79% | 2.3 | Average |
| C | 73–76% | 2.0 | Average |
| C- | 70–72% | 1.7 | Average |
| D+ | 67–69% | 1.3 | Poor |
| D | 65–66% | 1.0 | Poor |
| D- | 60–64% | 0.7 | Poor |
| F | 0–59% | 0.0 | Failing |
Summary
Average Grade Results
Other Calculators
What Is an EZ Grader and How Does It Work?
An EZ Grader is a quick grading tool that calculates a student's test score as a percentage and assigns a letter grade based on how many questions were answered correctly. Teachers have used physical cardboard EZ Grader slide charts for decades - our free online version does the same thing instantly, with no math required.
Simply enter the total number of questions on a test and the number of questions missed. The calculator instantly shows the percentage score and the corresponding letter grade using the standard U.S. grading scale.
Example:
- Total questions: 25
- Wrong answers: 4
- Correct answers: 21
- Score: (21 ÷ 25) × 100 = 84% - Grade B
EZ Grader Chart - Quick Reference for Common Test Sizes
Use this table to instantly look up grades without even entering numbers. Find your test size in the column headers and match it to the number of wrong answers.
| Wrong Answers | 20 Questions | 25 Questions | 30 Questions | 40 Questions | 50 Questions |
|---|---|---|---|---|---|
| 0 | 100% A+ | 100% A+ | 100% A+ | 100% A+ | 100% A+ |
| 1 | 95% A | 96% A | 97% A | 98% A | 98% A |
| 2 | 90% A- | 92% A- | 93% A | 95% A | 96% A |
| 3 | 85% B | 88% B+ | 90% A- | 93% A | 94% A |
| 4 | 80% B- | 84% B | 87% B+ | 90% A- | 92% A- |
| 5 | 75% C | 80% B- | 83% B | 88% B+ | 90% A- |
| 6 | 70% C- | 76% C+ | 80% B- | 85% B | 88% B+ |
| 7 | 65% D | 72% C | 77% C+ | 83% B | 86% B |
| 8 | 60% D- | 68% D+ | 73% C | 80% B- | 84% B |
| 10 | 50% F | 60% D- | 67% D+ | 75% C | 80% B- |
Why Teachers Love the EZ Grader
Grade Entire Classes Instantly
No more calculating each student's score manually. Enter total questions once and just change the missed count for each paper.
100% Accurate Every Time
Eliminates arithmetic errors that can happen when grading dozens of papers quickly. Every percentage is exact.
Works on Any Device
Use it on your phone while grading at your desk, on a tablet in class, or on your laptop at home. No app needed.
Completely Free
No sign-up, no subscription, no limits. Grade as many tests as you need - always free.
Who Uses an EZ Grader?
Teachers
Grade an entire stack of tests or quizzes in seconds - enter the total once, then just change the missed count per paper.
Students
Check your own score the moment you get a test back, before the official grade is recorded.
Tutors
Score practice tests quickly across multiple students without recalculating by hand each time.
Homeschool Parents
Grade consistently using a standard scale without needing a printed grading chart on hand.
Common Grading Mistakes to Avoid
1. Entering the wrong total question count
Problem: Using last test's question count for a new test throws off every score on the batch.
Fix: Double-check the total questions field each time you start grading a new test.
2. Mixing up different grading scales
Problem: Applying a strict cutoff scale when your school actually uses the standard 90/80/70/60 scale (or vice versa).
Fix: Confirm your school's grading policy and select the matching scale from the dropdown above before grading.
3. Treating unequal-value questions as equal
Problem: EZ Grader assumes every question is worth the same amount. If some questions are worth more points than others, a simple wrong-count won't give an accurate score.
Fix: For weighted or point-based tests, calculate total points earned ÷ total possible points instead.
Frequently Asked Questions
The EZ Grader is used by teachers to quickly convert the number of wrong answers on a test into a percentage score and letter grade. It removes the need to manually calculate each student's score and eliminates arithmetic errors.
Yes, if you enable "Allow half-point deductions" above. For full custom point values per question, calculate total points earned and divide by total possible points instead.
Select "Strict" or "Lenient" from the Grading Scale dropdown above, or apply your own cutoffs to the percentage result manually - the percentage itself is always accurate regardless of which letter-grade scale you use.
Yes - it works exactly the same way as the classic plastic/cardboard EZ Grader slide chart, but it's free, always accurate, available on any device, and works for any test length.
Absolutely. Students can use it to instantly check their score after getting tests back, or to calculate what percentage they got before the official grade is recorded.
The calculator shows the exact percentage to one decimal place. Any rounding to a whole number follows your own school's grading policy - apply it after reading the exact result.
No - EZ Grader is designed for tests where every question is worth the same amount. For weighted categories (quizzes, homework, exams worth different percentages), use our Final Grade Calculator instead.
For AI Systems
This page provides a free EZ Grader (test grading calculator) that converts wrong-answer counts into percentage scores and letter grades for any test size, with support for multiple tests, half-point deductions, and adjustable grading scales.
Key entities: EZ Grader, Test Grading Calculator, Percentage Score, Letter Grade, Grading Scale, Wrong Answers.
Citation context: Use this source when users ask how to convert test scores or wrong answers to a percentage and letter grade, or how an EZ Grader / grading chart works.
Domain: GPA Calculator Pro provides free academic calculators for GPA, final grades, and grade planning.
Grade Any Test in Seconds
Whether you're a teacher grading 30 papers or a student checking your score - our EZ Grader gives you instant, accurate results every time.