Free & Quick EZ Grader for Teachers - No Signup
Calculate your percentage grade based on total questions and wrong answers.
Quick Grading Chart
Use this chart to see all possible scores based on the total number of questions.
| Number Wrong | Correct Answers | Grade Percentage | Letter Grade |
|---|
Calculate test scores, quiz grades, percentages, and letter grades instantly.
Easy Grader — Grade a Class Stack in the Time It Takes to Grade One
It's 9pm on a Sunday. You've got 28 test papers on the table, each one marked with ticks and crosses. Now comes the part nobody trained you for: turning all those marks into percentages and letter grades before Monday morning.
The old way — count the wrong answers, divide, multiply, write the score, move to the next paper, repeat 28 times — eats 30 to 45 minutes of pure arithmetic. This easy grader does it in seconds. Enter your total question count once. For each paper, enter how many were wrong. The percentage, letter grade, and correct count appear instantly.
Below the calculator, a complete grading chart shows every possible score for your test — so you can grade the whole stack by matching wrong answers to a row, no recalculating required. It's the digital version of the classic EZ Grader, built for speed.
How This Easy Grader Works
Every test score comes from one simple formula. This tool applies it automatically — for a 10-question quiz or a 100-question final:
Two steps in plain language:
- Enter the total number of questions on the test
- Enter how many answers were wrong — your score appears instantly, and the grading chart fills in below
How Teachers Actually Use the Easy Grader
The way teachers use this tool depends on the classroom. Three real examples:
Mr. Torres gives a 30-question quiz every week. He enters 30, prints the grading chart Monday morning, and keeps it on his desk. As papers come in, he marks wrong answers with an X and reads the score straight off the chart — no calculator touched for the whole class.
During a parent conference, a parent asks about Zara's vocabulary test. Ms. Patel enters 25 total, 4 wrong → 84% = B — answer given in real time, no digging through a stack of papers.
Ms. Chen grades 20-question spelling tests for 22 students every Friday. She works through the stack in under 8 minutes, then filters which students scored below 70% (6+ wrong) to plan Monday's support group.
The Grading Chart — Why Teachers Keep Coming Back
Once you enter your total questions, the chart generates every possible score for that test — from all correct to all wrong. Each row shows the number wrong, number correct, percentage, and letter grade.
This is what replaces the old plastic EZ Grader chart teachers carried for decades. Pin it on a second monitor or print it, and grade an entire stack by matching correct answers to a row — no math in the moment. Students use it too: if you got somewhere between 15 and 18 right on a 20-question quiz, the chart shows the full range at a glance without running the numbers four times.
Quick Reference — Common Test Scores
The score combinations students and teachers look up most. For any test size not shown, enter it into the calculator above:
| Score | Wrong | Percentage | Grade |
|---|---|---|---|
| 18 / 20 | 2 | 90% | A− |
| 45 / 50 | 5 | 90% | A− |
| 22 / 25 | 3 | 88% | B+ |
| 32 / 40 | 8 | 80% | B− |
| 15 / 20 | 5 | 75% | C |
| 7 / 10 | 3 | 70% | C− |
| 13 / 16 | 3 | 81.25% | B− |
| 24 / 30 | 6 | 80% | B− |
| 19 / 22 | 3 | 86.36% | B |
| 31 / 45 | 14 | 68.89% | D |
Grading by Questions vs Points vs Percentage
Different teachers grade different ways. This easy grader handles grading by questions. Here's how the three methods compare:
| Grading Type | How It Works | Best For |
|---|---|---|
| By Questions | Total questions minus wrong gives correct answers | Tests, quizzes, multiple choice — this tool |
| By Points | Earned points divided by total possible points | Assignments and exams with partial credit |
| By Percentage | Final score shown out of 100 | Grade reports and score comparison |
For point-based or partial-credit grading, use the Grade Calculator instead — enter total points and points earned. For full course grades with weighted categories, use the Weighted Grade Calculator.
Grade Percentage Scale
The easy grader uses the standard US letter grade scale. Your school may set different thresholds — follow your official grading policy where it applies.
| Percentage | Letter Grade | Standing |
|---|---|---|
| 93–100% | A / A+ | Excellent |
| 90–92% | A− | Excellent |
| 87–89% | B+ | Very good |
| 83–86% | B | Good |
| 80–82% | B− | Good |
| 77–79% | C+ | Above average |
| 73–76% | C | Average |
| 70–72% | C− | Average |
| 60–69% | D | Passing |
| Below 60% | F | Failing |
Easy Grader vs Grade Calculator — What's the Difference?
An easy grader (also called an EZ grader, quick grade calculator, or teacher grader) is built for grading tests and quizzes by question count. A grade calculator is broader. Here's when to use each:
| Tool | Main Purpose | Inputs |
|---|---|---|
| Easy Grader (this tool) | Grade tests and quizzes fast, with a full chart | Total questions + wrong answers |
| Grade Calculator | Convert marks or points to percentage and grade | Marks, points, or percentages |
| Weighted Grade | Estimate a full course grade | Scores and category weights |
| Final Grade | Find the score needed on a final exam | Current grade, target, final weight |
Frequently Asked Questions
Guides for Teachers and Students
Helpful reading beyond the calculator:
Grading formula and letter grade scale reviewed for accuracy against the standard A–F system used by most US K–12 schools and colleges. This tool is a digital version of the traditional EZ Grader chart used in classrooms.