Grading Scale Calculator
Generate a complete grading scale for any number of questions. See every possible score, find out how many you can miss, and print a grading chart for your desk.
Grading Scale Calculator
Grade Results
Grade Boundary Analysis
What-If Scenarios
Complete Grading Table
Visual Analysis
Score Breakdown
Grade Scale Position
Grade Distribution
Score Curve
Impact Analysis
You May Also Need
EZ Grader
The fastest way to grade tests. Enter total questions and wrong answers for instant percentage scores and a printable grading table.
Test Grade Calculator
Calculate test scores from questions or points earned. Supports point-based scoring for mixed assessments.
Grading Scale
View complete grading scales with letter grades, percentages, and GPA equivalents across systems.
Grading Scale Percentages Comparison
| Percentage | Standard (10-pt) | Plus / Minus | 7-Point Scale |
|---|---|---|---|
| 97-100% | A | A+ | A+ |
| 93-96% | A | A | A |
| 90-92% | A | A- | A- |
| 88-89% | B | B+ | B+ |
| 85-87% | B | B | B |
| 83-84% | B | B | B- |
| 80-82% | B | B- | C+ |
| 77-79% | C | C+ | C |
| 73-76% | C | C | C- |
| 70-72% | C | C- | D |
| 67-69% | D | D+ | D |
| 60-66% | D | D / D- | F |
| Below 60% | F | F | F |
The grading scale calculator generates a complete grading chart for any number of questions on your test, quiz, or assignment. Enter your total questions to see every possible score with percentages and letter grades, or use the reverse lookup to find out how many questions you can miss and still reach your target grade.
How to Generate a Grading Scale by Number of Questions
Creating a grading scale for a specific test length takes seconds with this calculator. Start by entering the total number of questions on your assessment into the Total Questions field. This works for anything from a 6-question pop quiz to a 200-question final exam.
Next, enter how many questions were answered incorrectly into the Number Wrong field. Your percentage, letter grade, and a complete grading table generate instantly as you type — no button needed. The table shows every possible score from 0 wrong to all wrong, so you can use it as a reference sheet for the entire class.
Teachers commonly need grading scales for specific test lengths. Whether you have an 8-question quiz, a 10-question pop quiz, a 12-question worksheet, a 13-question vocabulary test, a 14 or 15-question chapter review, a 16-question unit quiz, an 18-question midterm section, a 20-question test, a 25-question exam, a 30-question unit test, a 40-question midterm, or a 50-question final, enter the number above to instantly generate the complete grading scale with percentages and letter grades for every possible score.
Switch to Reverse Lookup mode if a student asks “how many questions can I miss and still get a B?” Select the target grade, and the calculator tells you the exact number of wrong answers allowed. Select your grading scale from the tabs — Standard 10-point, Plus/Minus, or 7-Point — to match your school or district policy. Toggle half-points for tests that use partial credit.
Grading Scale Formula: How Each Wrong Answer Affects Your Percentage
Every question on a test carries equal weight. The grading scale calculator uses this formula to convert wrong answers into a percentage score and letter grade.
Percentage = ((Total Questions – Number Wrong) ÷ Total Questions) × 100
Per Question Value = 100 ÷ Total Questions
Example: 22 correct out of 25 = (22 ÷ 25) × 100 = 88.0% = B+
The per-question value is what makes test length so important. On a 10-question quiz, each question is worth 10 percentage points. One wrong answer drops you from 100% to 90%. On a 50-question test, each question is worth only 2%, so one mistake barely changes your grade.
Tests with 10, 20, 25, or 50 questions produce clean percentage breaks at every score. A 15-question quiz creates awkward percentages like 93.3% and 86.7%, making it harder to set clean grade boundaries. Check the EZ grader for instant grading of individual papers, or use the test grade calculator for assessments where questions carry different point values.
How Many Questions Can You Miss and Still Pass?
This is the question students ask most before an exam, and the answer depends entirely on test length and which grading scale your school uses. The reverse lookup mode above gives you the answer instantly, but understanding the math helps you plan ahead for any assessment.
On the standard 10-point scale, passing starts at 60%. That means you need to get at least 60% of the questions correct. On a 25-question test, 60% of 25 is 15 correct answers, so you can miss up to 10 questions and still pass with a D. For a B (80%), you can miss only 5 out of 25.
The grading scale also matters more than most students realize. On a 20-question test, missing 2 gives you 90%. That is an A on the standard scale but only an A-minus on the plus/minus scale, and the difference can affect your GPA. Students aiming for a specific cumulative GPA should check how their school’s grading scale converts letter grades to grade points.
Half-point scoring changes the grading scale as well. When teachers award partial credit, a student might miss 2.5 questions instead of a whole 3, which can mean the difference between a B and a C on shorter assessments. Toggle the half-point option above to see how partial credit affects the complete grading table for your test length.
For courses where homework, quizzes, and exams count differently toward your final grade, use our grade calculator to see how individual test scores combine with other weighted categories. If you already know your current grade and need to find out what score you need on the final, the quick grader gives you an instant answer.
📚 How to Cite This Page
Using this for a project? Copy a citation: