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How Many Questions Can I Miss on a Test? (Error Calculator)

Enter your test question count and target score to find out the maximum number of incorrect answers you can afford to get.

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Test Preparation Tool

"How Many Questions Can I Miss?" Calculator

Enter test length and your goal percentage to calculate your maximum error allowance.

Maximum Missed
10
Incorrect Answers Allowed
Must Get Correct
40
Minimum Correct Answers
Each Question Value
2.0%
Weight Per Question

Mistake Thresholds for Common Target Grades

Goal Letter GradeTarget PercentageMax Questions You Can MissMinimum Correct Needed

How to Use This Tool

  1. Enter total questions on your upcoming test or quiz.
  2. Enter your desired score percentage (e.g. 80% for a B or 90% for an A).
  3. Review the exact number of questions you can afford to miss.

Mathematical Formula

\text{Max Missed} = \text{Total Questions} - \lceil \text{Target} \times \text{Total} \rceil

Authoritative References & Academic Standards

Vetted against official government, institutional, and collegiate guidelines

.org sourceOfficial Source
Academic Grading in the United States
Wikipedia (Academic Standards Archive)

Comprehensive historical and institutional documentation of standard 10-point scales, percentage cutoffs, and GPA conversion tables.

.org sourceOfficial Source
Arithmetic Mean and Weighted Averages Overview
Khan Academy Mathematics

Educational mathematical foundations for calculating arithmetic means, category weights, and statistical dispersion.

.gov sourceOfficial Source
Uniform Public School Grading & Passing Policies
Texas Education Agency (TEA)

State education agency standards defining 70% passing cutoffs, secondary course credit minimums, and standard assessment rules.