How to Calculate Test Score
Test scoring is straightforward — divide correct answers by total questions, then multiply by 100:
Test Score = (Correct Answers ÷ Total Questions) × 100
Or equivalently: ((Total − Wrong) ÷ Total) × 100
Quick Example
A student takes a 40-question test and gets 5 wrong:
Correct = 40 − 5 = 35
Score = (35 ÷ 40) × 100 = 87.5% → B+
How to Use the Test Grade Calculator
Enter Total Questions
Type in the total number of questions or points on the test, quiz, or assignment.
Enter Number Wrong
Enter how many questions the student got wrong, or how many points were lost.
View Score Instantly
The calculator shows the correct count, percentage score, and letter grade in real-time.
Generate Grading Chart
Click "Show Full Grading Chart" to see every possible score — perfect for grading multiple papers.
Standard US Grading Scale
This is the most commonly used grading scale at US schools. Your school may use different cutoffs — check with your instructor. For GPA conversion, see our Percentage to GPA Calculator.
| Letter | Range | GPA |
|---|---|---|
| A+ | 97–100% | 4.0 |
| A | 93–96% | 4.0 |
| A− | 90–92% | 3.7 |
| B+ | 87–89% | 3.3 |
| B | 83–86% | 3.0 |
| B− | 80–82% | 2.7 |
| C+ | 77–79% | 2.3 |
| C | 73–76% | 2.0 |
| C− | 70–72% | 1.7 |
| D+ | 67–69% | 1.3 |
| D | 63–66% | 1.0 |
| D− | 60–62% | 0.7 |
| F | Below 60% | 0.0 |
For Teachers: Quick Grading Tips
Use the grading chart
Enter your test's total questions, click "Show Full Grading Chart," and use it as a quick-reference EZ grader while marking papers.
Partial credit
For partial credit, use total points (not questions). If a 50-point test earned 42 points, enter 50 total and 8 wrong.
Custom scales
Our calculator uses the standard US scale. If your school uses 50% passing or different letter cutoffs, adjust accordingly.
Track performance
Use our Grade Calculator to combine test scores with homework and projects for overall course grades.
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Frequently Asked Questions
Expert Validated for Accuracy
This test grade calculator uses the standard percentage formula and US grading scale. Validated by our team of education professionals and trusted by teachers and students.
Last validated: February 22, 2026.
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