20-Question Test Grade Calculator
20-question tests are common for weekly quizzes and unit checks. Enter how many you missed to see your percentage and letter grade instantly.
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20-Question Test Score Chart
A complete reference table showing all possible scores. Each wrong answer costs exactly 5% (since 100 ÷ 20 = 5). Your current performance is highlighted.
| Wrong | Correct | Percentage | Grade |
|---|
How This Is Calculated
Example: On a 20-question test, you answer 17 correctly (3 wrong):
Score = (17 / 20) × 100 = 0.85 × 100 = 85% (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 20-question test and still get an A?
You can miss at most 2 questions. Missing 3 questions gives you 17/20 = 85%, which is a B. Missing 2 or fewer gives you 90% or higher, which is an A.
What is 18 out of 20 as a percentage and letter grade?
18 out of 20 is 90%, which is an A. You can check the score chart above to verify this and see all other possible scores.
On a 20-question test, is 70% a passing grade?
70% is typically considered a passing grade at most schools (it's a C). On a 20-question test, 70% means you got 14 questions correct and missed 6. However, check your school's or instructor's minimum passing grade, as some require 60% or 75%.
Can I use this calculator for other test sizes?
Yes. Although this page is optimized for 20-question tests, the calculator is fully editable. You can change the total questions field to any number from 1 to 500 and use it for any test size.
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.