Education • Grades

EZ Grader

Quick grading calculator: enter total questions and wrong answers to get percentage and letter.

Direct Answer

An EZ Grader calculates percentage test scores using the formula: Grade % = [(Total Questions − Wrong Answers) ÷ Total Questions] × 100, immediately mapping the result to standard letter grades (A, B, C, D, F) across customizable 10-point or plus/minus scales.

Grading Scale

Total questionsWrong answersCorrect answers

Correct

—

Percentage

—

Letter

—

GPA

—

Grading Table Chart

Wrong	Correct	%	Letter

Formula: % = (total−wrong)/total ×100. Letters: A+97 A93 A-90 B+87 B83 B-80 C+77 C73 C-70 D+67 D63 D-60.

How to use

1Enter the total number of questions on the test or assignment.
2Enter the number of wrong answers (or correct answers, if enabled).
3Your percentage score and letter grade appear instantly, ready to record in your gradebook.

EZ Grader Test Formulas

Grade Percentage = [(Total Questions − Wrong Answers) ÷ Total Questions] × 100

Standard Letter Scale:
90%–100% = A | 80%–89% = B | 70%–79% = C | 60%–69% = D | <60% = F

Variable	Name	Meaning & Example
Q_total	Total Questions	Total number of items on quiz or exam (25)
Q_wrong	Wrong Answers	Incorrect or deducted question count (3)
Score %	Percentage Score	Percentage of earned points: ((Total − Wrong) ÷ Total) × 100 (88.0%)

How EZ Grader Calculates Test Grades:

Total Questions: The total number of points or questions on the quiz, test, or assignment.
Number Wrong: The count of incorrect or deducted points.
Total Correct: Total Questions − Number Wrong.
Percentage Score: (Total Correct ÷ Total Questions) × 100.
The tool generates a complete reference chart for every possible wrong answer count from 0 to total questions.

Examples

35-Question Test with 4 Wrong Answers

Step 1: Total questions = 35. Wrong answers = 4.
Step 2: Correct answers = 35 − 4 = 31 correct.
Step 3: Calculate percentage: (31 ÷ 35) × 100 = 88.57%.
Step 4: Standard letter grade = B+.

Score: 88.57% (Grade B+)

50-Question Exam with 7 Wrong Answers

Step 1: Total questions = 50. Wrong answers = 7.
Step 2: Correct answers = 50 − 7 = 43 correct.
Step 3: Calculate percentage: (43 ÷ 50) × 100 = 86.00%.
Step 4: Standard letter grade = B.

Score: 86.00% (Grade B)

About

The EZ grader is a fast grading aid for teachers, tutors, and parents. Enter the total number of questions and the number of wrong answers, and it instantly returns the percentage score and letter grade — no manual table lookup required. It is perfect for quickly marking quizzes, exams, and homework by hand, where an EZ grader chart is traditionally used. Because it accepts answers either way, it suits both scoring methods. The standard letter scale is applied automatically, so you can record grades immediately and move on to the next paper.

Frequently asked questions

What is an EZ Grader?

An EZ Grader is an educational slide chart and online grading calculator used by teachers and instructors to calculate percentage grades and letter scores quickly without manual arithmetic.

Does this EZ Grader support half points?

Yes, you can enter fractional or half points in the wrong answer field to accurately score quizzes with partial credit.

What grading scales does this EZ Grader support?

You can toggle between the Standard Plus/Minus scale (93+ A, 90-92 A-), the Standard 10-Point scale (90-100 A, 80-89 B), and the traditional 7-Point scale (93-100 A, 85-92 B).

Can I generate a full printable grading chart for my classroom?

Yes. The interactive chart displays every possible wrong answer count from 0 to total questions with corresponding percentage and letter grade equivalents.

Can I input partial points or half-credit questions?

Yes. You can enter decimal values for wrong answers (e.g., 2.5 missed points) to calculate exact fractional percentage scores.

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