40-Question Test Grade Calculator
40-question tests are standard for full-period exams and comprehensive assessments. Each question is worth exactly 2.5%. Enter how many you missed to instantly see your percentage and letter grade.
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40-Question Test Score Chart
This complete reference table shows your grade for every possible number of wrong answers on a 40-question test. Each wrong answer costs 2.5% of your total score. Your current score is highlighted.
How This Is Calculated
or equivalently
Score = ((40 − Questions Wrong) / 40) × 100%
Example: On a 40-question test, you answer 32 correctly (8 wrong):
Score = (32 / 40) × 100 = 0.80 × 100 = 80.0% (B−)
On a 40-question test, each question is worth exactly 2.5 percentage points (100 ÷ 40 = 2.5). 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 always verify with your course syllabus for the exact thresholds used in your class.
Frequently Asked Questions
What is 36 out of 40 as a percentage and letter grade?
36 out of 40 is 90%, which is an A. You missed 4 questions, and each question on a 40-question test is worth 2.5 percentage points.
What is 34 out of 40 as a percentage and letter grade?
34 out of 40 is 85%, which is a B. You missed 6 questions. You can check the score chart above to see how 85% fits into the grading scale.
How many questions can I miss on a 40-question test to get a 90?
You can miss at most 4 questions on a 40-question test to get a 90% (A). Missing 5 questions gives you 87.5%, which is a B.
Why is each question worth 2.5% on a 40-question test?
A 40-question test is worth 100 total percentage points. Dividing 100 by 40 questions gives you 2.5 percentage points per question. So each wrong answer costs exactly 2.5%.
Sources
Grading scale note: This calculator uses the most common US standard (A: 90–100%, B: 80–89%, C: 70–79%, D: 60–69%, F: <60%). However, grading scales vary significantly by school, district, and instructor. The scale shown here is a default reference, not an official conversion. Always verify with your course syllabus.