Test Grade Calculator
Enter total questions and wrong answers to instantly see your score percentage, letter grade, and a complete EZ Grader chart for every possible result.
Complete EZ Grader Scoring Chart
Your current score is highlighted. Scroll to see all possible results for this test length.
| Mistakes (Wrong) | Correct Answers | Score (%) | Letter Grade |
|---|
How Test Grading Works: Formula, Letter Grades & Passing Scores
Whether you are a teacher grading a stack of quizzes or a student double-checking your score, the math behind test grading is simple. Here is everything you need to know.
The Test Score Formula
Every test score starts with one simple equation:
Example: 18 out of 20 correct → (18 / 20) x 100 = 90% → Letter Grade: A−
Standard Letter Grade Scale
The most common 10-point scale used across US schools:
| Letter | Range | GPA |
|---|---|---|
| A | 93–100% | 4.0 |
| B | 83–92% | 3.0 |
| C | 73–82% | 2.0 |
| D | 63–72% | 1.0 |
| F | Below 60% | 0.0 |
What Score Is Passing?
The passing threshold depends on your school's policy:
- 60% — Passing at most US high schools (grade D)
- 70% — Required for many college major courses (grade C)
- 75% — Passing threshold in some nursing & health programs
- 65% — Common pass mark in Canadian high schools
Always check your syllabus — some instructors set their own cutoffs.
What Is an EZ Grader Chart?
An EZ Grader (also called a grading scale chart or scoring table) lists every possible score for a test of a given length — from 0 wrong answers to all wrong.
Teachers have used printed EZ Grader wheels for decades to avoid recalculating scores by hand. Our digital version is faster: change the Total Questions number above and the entire chart rebuilds instantly for any test from 1 to 500 questions.
Common Score Quick-Reference Chart
Looking up a specific fraction? Here are the most searched score conversions.
| Score (Fraction) | Percentage | Letter Grade | GPA Points |
|---|---|---|---|
| 20 / 20 | 100% | A+ | 4.0 |
| 18 / 20 | 90% | A− | 3.7 |
| 16 / 20 | 80% | B− | 2.7 |
| 45 / 50 | 90% | A− | 3.7 |
| 38 / 50 | 76% | C+ | 2.3 |
| 40 / 50 | 80% | B− | 2.7 |
| 70 / 100 | 70% | C− | 1.7 |
| 85 / 100 | 85% | B | 3.0 |
| 60 / 100 | 60% | D− | 0.7 |
* Letter grades and GPA values follow the standard US academic scale. Results may vary by institution.
Frequently Asked Questions
How do I calculate a test grade percentage?
Divide correct answers by total questions, then multiply by 100.
Example: 18 out of 20 → (18 / 20) x 100 = 90% → A−
Use the calculator above — type your total questions and wrong answers and results update instantly.
What letter grade is 76%?
On the standard US 10-point grading scale, 76% is a C+ (the C range covers 73–76%). Here is how the neighboring scores map:
- 73–76% → C+ (2.3 GPA)
- 70–72% → C− (1.7 GPA)
- 77–79% → C+ or B− depending on your school's +/− policy
Some schools use a 7-point scale where the cutoffs shift slightly. Always verify with your instructor's syllabus.
What is a passing grade on a test?
Most US schools define passing as 60% or above (a D grade or better). Specific programs often set higher bars:
- High school general courses: 60% (D)
- College core/major courses: 70% (C) — below a C may not fulfill prerequisites
- Nursing & Allied Health: Often 75–80%
- Graduate courses: Often 70–75%
Check your syllabus or institution's academic policy for the exact passing threshold in your course.
How do teachers use an EZ Grader chart?
An EZ Grader chart is a pre-calculated table showing the grade for every possible number of wrong answers on a given test. Instead of doing the division for each student individually, a teacher enters the total number of questions once and the chart handles the rest.
Traditional EZ Grader wheels were sold as physical slide-rule devices for classroom use. Our digital version works the same way: set the Total Questions input above and a full scoring chart is generated instantly — from 0 wrong to all wrong — with percentage scores and letter grades for every row.
Need to Calculate Your Overall Course Grade?
This tool grades individual tests. For your overall class standing, try our other free calculators: