How Many Questions Can I Get Wrong and Still Pass?
Wondering how many questions you can get wrong and still pass a test? The answer depends on three things: the total number of questions, the passing percentage required, and whether every question is worth the same number of points.
For example, if your test has 50 questions and you need at least 60% to pass, you need to answer at least 30 questions correctly. That means you can get 20 questions wrong and still pass.
However, the number changes when the passing grade is 70%, 75%, 80%, or another percentage. A 10-question quiz is also very different from a 100-question exam because every question represents a larger percentage of your final score.
This guide explains exactly how to calculate how many questions you can get wrong and still pass, with examples for common test sizes and passing grades.
Quick Answer: How Many Questions Can I Get Wrong and Still Pass?
The basic formula is:
Maximum wrong answers = Total questions − Minimum correct answers needed
To find the minimum number of correct answers:
Minimum correct answers = Total questions × Passing percentage
For example, suppose you have a 50-question test and the passing grade is 60%.
- Total questions = 50
- Passing percentage = 60%
- Correct answers needed = 50 × 0.60 = 30
- Maximum questions you can miss = 50 − 30 = 20
So, you can get 20 questions wrong and still pass with exactly 60%.
If your school uses a different passing requirement, simply replace 60% with the required percentage.
How Many Questions Can I Get Wrong and Still Pass With a 60%?
If your passing grade is 60%, you need to get at least 60% of the questions correct.
That means you can miss up to 40% of the questions.
Here are some common examples:
| Total Questions | Correct Needed for 60% | Maximum Wrong |
|---|---|---|
| 10 | 6 | 4 |
| 20 | 12 | 8 |
| 25 | 15 | 10 |
| 30 | 18 | 12 |
| 40 | 24 | 16 |
| 50 | 30 | 20 |
| 60 | 36 | 24 |
| 75 | 45 | 30 |
| 100 | 60 | 40 |
For example, on a 25-question test, you need at least 15 correct answers to reach 60%. Therefore, you can miss 10 questions and still receive 60%.
Keep in mind that some schools, courses, professional exams, and instructors use different passing standards. Always check the grading requirements for your specific test.
How Many Questions Can I Get Wrong and Still Pass With a 70%?
If you need a 70% to pass, you can miss up to 30% of the questions.
For a 50-question test:
50 × 0.70 = 35 correct answers
Therefore:
50 − 35 = 15 wrong answers
You can get 15 questions wrong and still earn 70%.
Some examples:
| Total Questions | Correct Needed for 70% | Maximum Wrong |
|---|---|---|
| 10 | 7 | 3 |
| 20 | 14 | 6 |
| 25 | 18 | 7 |
| 30 | 21 | 9 |
| 40 | 28 | 12 |
| 50 | 35 | 15 |
| 60 | 42 | 18 |
| 75 | 53 | 22 |
| 100 | 70 | 30 |
Important Note About Rounding
With certain test lengths, multiplying by a percentage can produce a decimal.
For example:
25 × 0.70 = 17.5
You cannot answer half a question correctly on a standard multiple-choice test. To guarantee at least 70%, you need to round the required correct answers up to 18.
Therefore:
25 − 18 = 7
You can miss 7 questions and score 18/25, which equals 72%.
If you missed 8 questions, you would have 17/25, which is 68%, below a 70% passing requirement.
How Many Questions Can I Get Wrong and Still Pass With an 80%?
An 80% passing grade means you must answer at least 80% of the questions correctly.
Therefore, you can miss approximately 20% of the questions.
For a 50-question test:
50 × 0.80 = 40 correct
So:
50 − 40 = 10 wrong
You can get 10 questions wrong and still score exactly 80%.
Here are more examples:
| Total Questions | Correct Needed for 80% | Maximum Wrong |
|---|---|---|
| 10 | 8 | 2 |
| 20 | 16 | 4 |
| 25 | 20 | 5 |
| 30 | 24 | 6 |
| 40 | 32 | 8 |
| 50 | 40 | 10 |
| 60 | 48 | 12 |
| 75 | 60 | 15 |
| 100 | 80 | 20 |
An 80% requirement gives you much less room for mistakes than a 60% requirement.
How Many Questions Can I Get Wrong and Still Pass With a 90%?
If you need 90% to pass, you can only miss approximately 10% of the questions.
For example, on a 100-question test:
- 90 correct = 90%
- 10 wrong = 10%
- Final score = 90%
Therefore, you can miss 10 questions and still achieve 90%.
On a 50-question test:
50 × 0.90 = 45
You need 45 correct answers, so:
50 − 45 = 5
You can miss 5 questions and still receive 90%.
How Many Questions Can I Get Wrong on a 10-Question Test?
Small tests are less forgiving because each question represents a large percentage of your score.
On a 10-question test, every question is worth:
100 ÷ 10 = 10 percentage points
So:
- 10/10 = 100%
- 9/10 = 90%
- 8/10 = 80%
- 7/10 = 70%
- 6/10 = 60%
- 5/10 = 50%
If your passing grade is 60%, you can miss 4 questions.
If your passing grade is 70%, you can miss 3 questions.
If your passing grade is 80%, you can miss 2 questions.
If your passing grade is 90%, you can miss 1 question.
How Many Questions Can I Get Wrong on a 20-Question Test?
On a 20-question test, each question is worth:
100 ÷ 20 = 5 percentage points
That means:
- 20 correct = 100%
- 19 correct = 95%
- 18 correct = 90%
- 17 correct = 85%
- 16 correct = 80%
- 15 correct = 75%
- 14 correct = 70%
- 13 correct = 65%
- 12 correct = 60%
Therefore, if 60% is the passing score, you can miss 8 questions and still get 12 correct.
If 70% is required, you can miss 6 questions.
If 80% is required, you can miss 4 questions.
How Many Questions Can I Get Wrong on a 25-Question Test?
A 25-question test is useful to understand because every question represents 4 percentage points.
Here is the calculation:
100 ÷ 25 = 4% per question
That means:
- 25 correct = 100%
- 24 correct = 96%
- 23 correct = 92%
- 22 correct = 88%
- 21 correct = 84%
- 20 correct = 80%
- 19 correct = 76%
- 18 correct = 72%
- 17 correct = 68%
- 16 correct = 64%
- 15 correct = 60%
So, if the passing grade is 60%, you can miss 10 questions.
If the passing grade is 70%, you need at least 18 correct answers, meaning you can miss 7 questions.
If the passing grade is 80%, you need 20 correct answers, meaning you can miss 5 questions.
How Many Questions Can I Get Wrong on a 50-Question Test?
A 50-question test is straightforward because every question is worth 2%.
Here are some common scores:
| Correct | Wrong | Percentage |
|---|---|---|
| 50 | 0 | 100% |
| 45 | 5 | 90% |
| 40 | 10 | 80% |
| 35 | 15 | 70% |
| 30 | 20 | 60% |
| 25 | 25 | 50% |
Therefore:
- For a 60% passing grade, you can miss 20
- For a 70% passing grade, you can miss 15
- For an 80% passing grade, you can miss 10
- For a 90% passing grade, you can miss 5
How Many Questions Can I Get Wrong on a 100-Question Test?
A 100-question test makes the calculation especially easy because each question is worth exactly 1%.
For example:
- 95 correct = 95%
- 90 correct = 90%
- 80 correct = 80%
- 75 correct = 75%
- 70 correct = 70%
- 60 correct = 60%
Therefore:
| Passing Grade | Minimum Correct | Maximum Wrong |
|---|---|---|
| 60% | 60 | 40 |
| 65% | 65 | 35 |
| 70% | 70 | 30 |
| 75% | 75 | 25 |
| 80% | 80 | 20 |
| 85% | 85 | 15 |
| 90% | 90 | 10 |
| 95% | 95 | 5 |
This is one of the easiest test formats for calculating the maximum number of mistakes you can make.
How to Calculate How Many Questions You Can Miss
You can calculate your maximum wrong answers in three simple steps.
Step 1: Find the total number of questions
Start by determining how many questions are on your test.
For example:
Total = 40 questions
Step 2: Find the passing percentage
Next, determine the minimum percentage required to pass.
Suppose the requirement is:
Passing grade = 70%
Step 3: Calculate the required correct answers
Multiply the total questions by the passing percentage:
40 × 0.70 = 28
You need at least 28 correct answers.
Now subtract that number from the total:
40 − 28 = 12
Therefore, you can get 12 questions wrong and still score 70%.
The Simple Formula
The easiest general formula is:
Maximum wrong answers = Total questions − Required correct answers
And:
Required correct answers = Total questions × Passing percentage
You can combine both steps:
Maximum wrong answers = Total questions − (Total questions × Passing percentage)
Or:
Maximum wrong answers = Total questions × (1 − Passing percentage)
For example, if you have 80 questions and need 75%:
80 × (1 − 0.75)
80 × 0.25 = 20
You can miss 20 questions and still reach 75%.
What If the Result Is a Decimal?
This is important for smaller tests.
Suppose you have 30 questions and need 80%.
30 × 0.80 = 24
You need 24 correct answers, so you can miss 6.
But suppose you have 33 questions and need 80%.
33 × 0.80 = 26.4
Because you cannot get 26.4 questions correct, you need at least 27 correct answers to reach or exceed 80%.
Therefore:
33 − 27 = 6
You can miss 6 questions.
Your score would be:
27 ÷ 33 × 100 = 81.82%
If you missed 7, you would have 26/33, or about 78.79%, which would be below 80%.
What Percentage Do I Need to Pass?
There is no universal passing percentage for every test.
The required score depends on the school, teacher, course, college, certification, or examination system.
A test might use:
- 50% as a passing score
- 60% as a passing score
- 65% as a passing score
- 70% as a passing score
- 75% as a passing score
- 80% or higher for a particular requirement
Some exams also use scaled scoring rather than simply converting the number of correct answers into a percentage.
For that reason, always check the official grading rules for your specific exam before deciding how many questions you can afford to miss.
Does Every Wrong Answer Count the Same?
Not necessarily.
The simple calculations in this guide assume that every question has equal value and that there is no penalty for incorrect answers.
Many classroom quizzes and basic tests work this way, but some exams use different scoring systems.
For example, an exam may have:
- Questions worth different numbers of points
- Partial credit
- Negative marking
- Bonus questions
- Weighted sections
- A curve
- Scaled scoring
If questions have different point values, counting the number of wrong questions alone may not tell you your final score.
In that situation, calculate your score using the total points earned and total points available.
What If the Test Has Different Point Values?
Suppose a test has 20 questions, but some questions are worth 1 point and others are worth 5 points.
Getting one high-value question wrong could affect your grade more than getting one low-value question wrong.
In that situation, use:
Percentage = (Points Earned ÷ Total Points) × 100
For example, if you earn 42 points out of 50:
42 ÷ 50 × 100 = 84%
Your score is 84%, regardless of how many individual questions you missed.
This is why students should check whether their test is graded by questions or by points.
What If There Is Negative Marking?
Some exams deduct points for incorrect answers.
For example, imagine an exam where:
- A correct answer gives +1 point
- A wrong answer gives −0.25 points
- An unanswered question gives 0 points
In that situation, simply subtracting wrong answers from total questions will not give your actual score.
You need to calculate the points earned after penalties.
Always check the official scoring rules before guessing how many questions you can miss.
How Many Questions Can I Get Wrong and Still Get an A?
If an A begins at 90%, you generally need at least 90% correct.
That means you can miss approximately 10% of the questions.
Examples:
- 10 questions → miss 1
- 20 questions → miss 2
- 50 questions → miss 5
- 100 questions → miss 10
However, letter-grade boundaries vary between schools.
Some grading systems may define an A as 90%, while others may use a different cutoff.
How Many Questions Can I Get Wrong and Still Get a B?
If a B begins at 80%, you generally need at least 80% correct.
Examples:
- 10 questions → miss 2
- 20 questions → miss 4
- 25 questions → miss 5
- 50 questions → miss 10
- 100 questions → miss 20
Check your school’s grading scale because the exact B cutoff can differ.
How Many Questions Can I Get Wrong and Still Get a C?
If a C begins at 70%, you generally need at least 70% correct.
Examples:
- 10 questions → miss 3
- 20 questions → miss 6
- 50 questions → miss 15
- 100 questions → miss 30
Again, the exact cutoff depends on your grading system.
How Many Questions Can I Miss Before I Fail?
The answer depends entirely on your passing requirement.
If your passing score is 60%, you can lose up to approximately 40% of the available points.
If your passing score is 70%, you can lose approximately 30%.
If your passing score is 80%, you can lose approximately 20%.
A useful way to think about it is:
Allowed mistakes = 100% − passing percentage
For example:
100% − 70% = 30%
So you have approximately 30% of the test available for mistakes when every question has equal value.
Why Longer Tests Give You More Room for Individual Mistakes
The number of questions affects how much each mistake changes your percentage.
On a 10-question test, one wrong answer costs 10 percentage points.
On a 100-question test, one wrong answer costs only 1 percentage point.
For example:
10-question test
9/10 = 90%
One mistake drops the score from 100% to 90%.
100-question test
99/100 = 99%
One mistake drops the score from 100% to 99%.
This does not necessarily mean a longer test is easier, but it does mean each individual question has less impact on the percentage.
What If I Don’t Know My Passing Grade?
If you don’t know the passing grade, don’t assume.
Ask your teacher, check your syllabus, review your school’s grading policy, or look at the official instructions for the examination.
Knowing the total number of questions alone isn’t enough.
For example, on a 50-question test:
- At 60%, you can miss 20.
- At 70%, you can miss 15.
- At 80%, you can miss 10.
- At 90%, you can miss 5.
The difference is significant.
Use a Grade Calculator to Check Your Score
Doing the calculation yourself is easy, but a test grade calculator can be useful when the test has an unusual number of questions or when you want to compare several possible scores.
For example, you can enter:
- Total number of questions
- Correct answers
- Wrong answers
- Required passing percentage
The calculator can then show your percentage and help you determine whether you passed.
A calculator is especially useful for tests with 17, 23, 37, 43, 67, or another unusual number of questions where the percentage is less obvious.
Quick Reference: Questions You Can Miss
The following examples assume every question has equal value.
| Test Size | 60% Passing | 70% Passing | 80% Passing | 90% Passing |
|---|---|---|---|---|
| 10 | 4 | 3 | 2 | 1 |
| 20 | 8 | 6 | 4 | 2 |
| 25 | 10 | 7 | 5 | 2 |
| 30 | 12 | 9 | 6 | 3 |
| 40 | 16 | 12 | 8 | 4 |
| 50 | 20 | 15 | 10 | 5 |
| 60 | 24 | 18 | 12 | 6 |
| 75 | 30 | 22 | 15 | 7 |
| 100 | 40 | 30 | 20 | 10 |
For percentages that do not produce a whole number of required correct answers, the minimum correct score must be rounded up to ensure that the passing percentage is actually reached.
Examples of Real Test Situations
Example 1: 40 Questions With a 60% Passing Grade
You need:
40 × 0.60 = 24 correct
Therefore:
40 − 24 = 16
You can miss 16 questions and still pass with exactly 60%.
Example 2: 50 Questions With a 70% Passing Grade
You need:
50 × 0.70 = 35 correct
Therefore:
50 − 35 = 15
You can miss 15 questions.
Your score would be:
35 ÷ 50 × 100 = 70%
Example 3: 75 Questions With an 80% Passing Grade
You need:
75 × 0.80 = 60 correct
Therefore:
75 − 60 = 15
You can miss 15 questions and still score 80%.
Example 4: 30 Questions With a 70% Passing Grade
You need:
30 × 0.70 = 21 correct
Therefore:
30 − 21 = 9
You can miss 9 questions and still pass with 70%.
Example 5: 25 Questions With an 80% Passing Grade
You need:
25 × 0.80 = 20 correct
Therefore:
25 − 20 = 5
You can miss 5 questions and still earn 80%.
What Should I Do If I’m Close to the Passing Score?
If you’re taking a test and you’re unsure about several questions, don’t automatically assume that you’re going to fail.
First, determine how many questions you need correct.
Then prioritize the questions you have the best chance of answering correctly.
If the test allows you to skip questions and return later, consider answering the questions you know first. This can help you avoid spending too much time on one difficult question.
If guessing is allowed and there is no penalty for incorrect answers, answering every remaining question may give you a chance to earn additional points.
If there is negative marking, however, follow the exam’s official strategy and scoring rules rather than assuming guessing is beneficial.
How to Improve Your Chances of Passing
Knowing how many questions you can miss is useful, but your goal should generally be to create a comfortable margin above the passing score.
Here are some practical strategies:
1. Learn the highest-priority material
Focus on concepts, formulas, vocabulary, and topics that are emphasized in your course materials.
2. Practice with similar questions
Practice tests can help you identify areas where you consistently make mistakes.
3. Review your mistakes
Don’t just check whether an answer was wrong. Understand why it was wrong.
4. Read questions carefully
Some mistakes happen because students misunderstand what a question is asking rather than because they don’t know the material.
5. Manage your time
Don’t spend most of the test on one difficult question if other questions are still unanswered.
6. Check your answers
If you have time remaining, review calculations and questions you marked as uncertain.
7. Know the grading system
Before the test, understand the passing score, point values, time limit, and any penalty for wrong answers.
Frequently Asked Questions
How many questions can I get wrong and still pass a test?
It depends on the total number of questions and the passing percentage. For example, with a 60% passing requirement, you can miss approximately 40% of an equally weighted test.
Can I get 20 questions wrong and still pass?
Yes, depending on the test. On a 50-question test with a 60% passing requirement, you can miss 20 questions and still score 60%.
On a different test, 20 wrong answers could result in a failing score.
How many questions can I miss on a 50-question test?
If 60% is required, you can miss 20. If 70% is required, you can miss 15. If 80% is required, you can miss 10. If 90% is required, you can miss 5.
How many questions can I miss on a 100-question test?
If 60% is required, you can miss 40. At 70%, you can miss 30. At 80%, you can miss 20. At 90%, you can miss 10.
How many questions can I get wrong and still get 70%?
You can miss up to approximately 30% of an equally weighted test. For example, on a 50-question test, you can miss 15 and get 35 correct for exactly 70%.
How many questions can I get wrong and still get 80%?
You can miss up to approximately 20% of an equally weighted test. For example, on a 50-question test, you can miss 10 and get 40 correct for 80%.
How many questions can I get wrong and still get 90%?
You can miss approximately 10% of an equally weighted test. On a 50-question test, that means you can miss 5 and still score 90%.
Is 60% usually a passing grade?
A 60% score is a passing grade in some grading systems, but not all. Passing requirements vary by school, course, instructor, exam, and educational system.
What if my test has different point values?
If questions have different point values, calculate your score using points rather than simply counting wrong questions. Use:
Percentage = (Points Earned ÷ Total Points) × 100
What if there is negative marking?
If incorrect answers lose points, the basic wrong-answer formula may not accurately predict your score. You should use the official scoring rules for the exam.
Does every test use the same grading scale?
No. Different schools, teachers, colleges, and examinations can use different grading scales. Always check the grading policy that applies to your test.
Final Answer: How Many Questions Can I Get Wrong and Still Pass?
There isn’t one universal number of questions you can get wrong and still pass. The answer depends on the number of questions and the required passing percentage.
The easiest formula is:
Maximum wrong answers = Total questions − Required correct answers
First calculate:
Required correct answers = Total questions × Passing percentage
For example, if you have a 50-question test and need 70% to pass:
50 × 0.70 = 35 correct
Then:
50 − 35 = 15 wrong
So you can get 15 questions wrong and still pass with exactly 70%.
For an equally weighted test, remember this simple rule:
- 60% passing → approximately 40% can be wrong
- 70% passing → approximately 30% can be wrong
- 80% passing → approximately 20% can be wrong
- 90% passing → approximately 10% can be wrong
However, if your exam uses weighted questions, partial credit, negative marking, curves, or scaled scoring, the calculation can be different.
The safest approach is to check the official passing requirement and calculate your score based on the actual points available. That gives you a much more accurate picture of whether you have enough correct answers to pass.