How many can I get wrong and still pass?

To pass (60%): you can miss up to 40% of questions. On a 50-question test: miss up to 20. On a 100-question test: miss up to 40. On a 25-question test: miss up to 10.

How many wrong for an A on a 50-question test?

For an A (93%+): miss at most 3.5, so 3 wrong maximum. For an A- (90%+): miss at most 5. For a B (83%+): miss at most 8. Use our calculator for any test size.

What percentage is a passing grade?

Most schools: 60% (D) is the minimum passing grade. Some programs require 70% (C) or 80% (B) for certain courses. Graduate programs often require 80%+ (B).

How do I convert my score to GPA?

Standard conversion: A=4.0, B=3.0, C=2.0, D=1.0, F=0.0. With +/- grades: A-=3.7, B+=3.3, etc. Our calculator shows the GPA equivalent automatically.

What if questions have different point values?

This calculator assumes equal-weight questions. For tests with varying point values, use our Grade Calculator instead, which handles different point totals per item.

How many wrong for a B on a 100-question test?

For a B (83%+): miss at most 17. For a B+ (87%+): miss at most 13. For a B- (80%+): miss at most 20. The table shows all possibilities.

What is the difference between this and the Grade Calculator?

Test Grade: simple score-to-grade for a single test. Grade Calculator: weighted averages across multiple assignments. Use Test Grade for quick score checks, Grade Calculator for overall course grade.

Test Grade Calculator - Free Score to Grade Converter (2026)

Your Test Grade

Score to percentage to letter grade

Percentage

90.0%

Letter

A-

Score

45/50

GPA

3.7

How Many Wrong = What Grade?

Wrong	Score	Percentage	Grade

// Lifestyle · ShashaTools

Test Grade

Total Questions 50

1200

Number Wrong 5

0200

How many questions you got wrong (or left blank).

// Results

Test Grade

90.0%

Percentage

90.0%

Letter / GPA

A- (3.7)

Correct

45 out of 50

Wrong

5 incorrect

Pass?

Yes ✅

45/50 = 90.0% (A-)

How to Use This Calculator

Convert any test score to a letter grade

Step 1 Enter Score

Enter total questions

How many questions were on the test. Works for any size: 10, 25, 50, 100, or any custom number.

Enter number wrong

How many you got wrong or left blank. Correct answers are calculated automatically (total minus wrong).

See your grade

Percentage, letter grade, GPA equivalent, and pass/fail status instantly. The doughnut shows correct vs wrong proportion.

Check the grading table

See what grade each number of wrong answers gives. Find exactly how many you could have missed for each letter grade.

💡 Quick math: On a 50-question test: 0-3 wrong = A, 4-5 wrong = A-, 6-8 wrong = B+/B, 9-10 wrong = B-, 15 wrong = C, 20 wrong = D (pass). The table shows your exact test.

Step 2 Use Cases

Quick score check

Teacher hands back the test. You see “42/50” but want to know the letter grade. Enter it here: 84% = B.

Pre-test planning

How many can I get wrong and still get a B? Enter total questions, slide “wrong” until you see your target grade. Plan your confidence level.

Teachers grading

Quickly grade a stack of tests. Enter total questions once, slide wrong count for each student. Faster than calculating each percentage manually.

Practice test scoring

Score practice tests to track improvement. Compare percentages across attempts to see if your study method is working.

💡 Tip: For tests with different point values per question (not all worth 1 point), use our Grade Calculator instead. This calculator assumes equal-weight questions.

// Related Calculators

📊

Grade Calculator

Weighted grade across multiple assignments.

🎯

Final Grade Calculator

What do I need on the final?

🎓

GPA Calculator

Calculate semester or cumulative GPA.

📚

Study Time Calculator

Plan study sessions for better scores.

// Complete Guide — Updated 2026

Test Grading:
The Complete Guide

Converting a raw test score to a percentage and letter grade is simple math, but knowing how many questions you can miss for each grade level is surprisingly useful. This guide covers the grading formula, common test sizes, and strategies for test-taking.

The Formula

// Test Grade

Percentage = (Correct ÷ Total) × 100

45 correct out of 50 = (45/50) × 100 = 90% (A-)

How Many Wrong for Each Grade?

Test Size	A (93%+)	B (83%+)	C (73%+)	Pass (60%+)
20 questions	≤1 wrong	≤3 wrong	≤5 wrong	≤8 wrong
50 questions	≤3 wrong	≤8 wrong	≤13 wrong	≤20 wrong
100 questions	≤7 wrong	≤17 wrong	≤27 wrong	≤40 wrong

Real-World Scenarios

Scenario 1: Quick Check. James gets his biology test back: 38/45. What grade? 84.4% = B. He missed 7 questions. For an A he needed to miss only 3 or fewer. He is 4 questions away from an A. Use our Study Time Calculator to plan targeted review.

Scenario 2: Pre-Test Strategy. Maria has a 100-question final. She wants at least a B (83%). Maximum wrong: 17 questions. That means she needs 83 correct. She identifies 20 topics she is unsure about and focuses study there. If she masters half of those, she gets 90 right = A-.

Scenario 3: Teacher Grading. Mr. David has 30 students with 40-question tests. He enters 40 as total, then slides “wrong” for each student: 2 wrong = 95% A, 5 wrong = 87.5% B+, 12 wrong = 70% C-. Faster than calculating 30 individual percentages.

Scenario 4: Practice Test Tracking. Priya takes practice tests for her certification exam. Attempt 1: 62/80 = 77.5%. Attempt 2: 68/80 = 85%. Attempt 3: 72/80 = 90%. Clear improvement. She is ready for the real exam. Use our Grade Calculator to weight practice vs real scores.

💡 Key insight: On a 50-question test, the difference between an A and a B is just 5 questions. The difference between passing and failing is 20 questions. Small improvements in accuracy (2-3 more correct) can jump you an entire letter grade. Focus on eliminating careless errors first — they are the cheapest points to recover.

Grade Scale

A (93%+)	4.0
B (83-86%)	3.0
C (73-76%)	2.0
D (60-69%)	1.0
F (<60%)	0.0

// Frequently Asked Questions

Common Questions About Test Grades

How do I calculate my test grade? +

(Correct / Total) x 100. Got 42/50: (42/50) x 100 = 84% = B.

How many wrong and still pass? +

Miss up to 40% of questions. 50 questions: miss 20. 100 questions: miss 40. 25 questions: miss 10.

What is the grading scale? +

A: 93-100, A-: 90-92, B+: 87-89, B: 83-86, B-: 80-82, C: 73-76, D: 60-69, F: below 60. Some schools differ.

How many wrong for an A on 50 questions? +

A (93%+): max 3 wrong. A- (90%+): max 5. B (83%+): max 8. Use calculator for any test size.

What percentage is passing? +

Most schools: 60% (D). Major requirements: often 70% (C). Grad programs: usually 80% (B).

How to convert to GPA? +

A=4.0, B=3.0, C=2.0, D=1.0, F=0.0. With +/-: A-=3.7, B+=3.3. Calculator shows this automatically.

Different point values per question? +

This assumes equal weight. For varying points, use our Grade Calculator which handles different point totals per item.

How many wrong for B on 100 questions? +

B (83%+): max 17 wrong. B+ (87%+): max 13. B- (80%+): max 20. Table shows all.

Works for quizzes? +

Yes. Any question count: 5-question quiz, 20-question test, 100-question final. Enter total and wrong.

Difference from Grade Calculator? +

Test Grade: single test score to grade. Grade Calculator: weighted average across multiple assignments. Different tools, different purposes.

Test GradeCalculator

Test Grading:The Complete Guide

The Formula

How Many Wrong for Each Grade?

Real-World Scenarios

Test Grade
Calculator

Test Grading:
The Complete Guide