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How Many Questions Can I Miss Calculator

Enter your test size and target grade to find the maximum number of questions you can miss and still reach your goal.

1–500 questions
%
0–100%
You Can Miss Up To

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Boundary Case: The Cliff Edge

Missed Score % Grade

How This Is Calculated

Max Questions You Can Miss = ⌊(100 − target%) ÷ points per question⌋
where points per question = 100 ÷ total questions

Example: On a 25-question test targeting 80%:
• Points per question = 100 ÷ 25 = 4% each
• Max misses = ⌊(100 − 80) ÷ 4⌋ = ⌊20 ÷ 4⌋ = 5 questions
• If you miss 5: score = (20 ÷ 25) × 100 = 80% ✓
• If you miss 6: score = (19 ÷ 25) × 100 = 76% (below target)

The formula uses the floor function (⌊ ⌋) so the result is a whole number—you cannot miss a fraction of a question. The maximum is clamped to the total number of questions; even if the math says you can miss 30 questions on a 25-question test, the real answer is "you're guaranteed to pass."

Note on grading scales: This calculator uses the standard US scale (A 90, B 80, C 70, D 60, F below 60) as a default. However, grading scales vary by school, instructor, and course. Some schools use 93% for an A, others use weighted scales or plus/minus variants. Always check your course syllabus or ask your instructor for the exact scale and grade weights used in your class.

Why This Matters

Knowing exactly how many questions you can miss is the fastest way to reality-check your study prep. "I need to get 90% on the final" is abstract; "I can miss 5 out of 25" is actionable. It also helps you decide how much time to invest in a study group or tutoring—if you're already on track to pass by the raw numbers, you might focus energy elsewhere.

Related Tools

Once you know your test score, use the Test Grade Calculator to convert that score to a percentage and letter grade. Or explore the full suite of exam tools below.

Frequently Asked Questions

How many questions can I get wrong on a 25-question test to pass?

To pass with a D (60% or higher) on a 25-question test, you can miss 10 questions. Each question is worth 4% (100÷25), so missing 10 means 60% score. To get a C (70%), miss at most 7 questions. To get a B (80%), miss at most 5 questions. Enter your specific test size and target grade to find your exact maximum.

How many can I miss on a 50-question test and still get a B?

On a 50-question test, a B requires 80% or higher. Each question is worth 2% (100÷50). To reach 80%, you need 40 correct answers, so you can miss up to 10 questions. For a B+ (87%), you can miss up to 6 questions.

Can I use this for extra credit or curves?

This calculator shows the raw calculation based on total questions and target percentage. If your instructor applies a curve or extra credit after grading, that changes your final score. Enter your adjusted target percentage if you expect those changes—for example, if your test has 50 questions but a 5-point curve is applied, you might use 85% as your target instead of 80%.

Do all schools grade the same way?

No. Most US schools use 90–100% = A, 80–89% = B, 70–79% = C, 60–69% = D, 0–59% = F. But some use 93% for A, or weighted scales. Always check your course syllabus for the exact scale your instructor uses. This calculator uses the standard US scale as the default.

What if my target grade percentage is above 100%?

If your target is above 100%, the calculator will mark it as unreachable—no test can score above 100% without extra credit. If a target between 0–100% seems unreachable with the given test size, double-check the math: the calculator will show you the best attainable grade and explain why it's impossible.

Is my data saved?

Everything stays in your browser—nothing is uploaded. Your inputs are not saved between sessions unless your browser keeps its cache.

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