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.
Frequently Asked Questions
What is the EZ Grader used for?
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.
Can I use this for tests with partial credit?
Our EZ Grader works for tests where each question is worth equal points. For tests with partial credit or varying point values, you would need to calculate the total points earned and divide by total possible points.
What if my school uses a different grading scale?
Some schools set passing at 70% while others use 60%. The percentage our tool calculates is always accurate — you can apply your own school's letter grade cutoffs to the percentage result.
Is this the same as the cardboard EZ Grader?
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.
Can students use this too?
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.
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.