30-Question Test Grade Calculator
30-question tests are common for comprehensive chapter exams and full-period assessments. Enter how many you missed to see your percentage and letter grade instantly.
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30-Question Test Score Chart
A complete reference showing all possible scores. Each wrong answer costs exactly 3.33 percentage points (since 100 ÷ 30 = 3.333…). Your current performance is highlighted.
How This Is Calculated
Example: On a 30-question test, you answer 24 correctly (6 wrong):
Score = (24 / 30) × 100 = 0.8 × 100 = 80.0% (B grade)
The letter grade cutoffs follow the standard US grading scale: A (90–100%), B (80–89%), C (70–79%), D (60–69%), F (below 60%). However, grading scales vary by school and instructor, so verify with your syllabus.
Frequently Asked Questions
How many questions can I miss on a 30-question test and still get an A?
You can miss at most 3 questions. Missing 3 questions gives you 27/30 = 90.0%, which is exactly an A. Missing 4 or more drops you below 90%, into B territory.
What percentage is 27 out of 30 questions?
27 out of 30 is 90.0%, which is an A grade. The score chart shows that each missed question on a 30-question test costs 3.33 percentage points.
What is 25 out of 30 as a grade percentage?
25 out of 30 is 83.3%, which is a B grade. Missing 5 questions on a 30-question test puts you solidly in the B range (80–89%).
Why is the score chart split into two columns?
The left column shows results for missing 0–15 questions, and the right column shows 16–30. This two-column layout keeps the full 31-row table readable on all screen sizes, especially phones, without requiring horizontal scrolling of the page itself.
Sources
Grading scale note: This calculator uses the standard US grading scale: A (90–100%), B (80–89%), C (70–79%), D (60–69%), F (<60%). Some schools use different thresholds, so check your course syllabus for your instructor's exact scale.