Questions Right Calculator Formula

Understand the math behind the questions right calculator. Each variable explained with a worked example.

Use the Questions Right Calculator

Formulas Used

Questions Needed Correct

needed = ceil(total_questions * target_pct / 100)

Questions You Can Miss

can_miss = total_questions - ceil(total_questions * target_pct / 100)

Exact Number Needed

exact = total_questions * target_pct / 100

Variables

VariableDescriptionDefault
total_questionsTotal Questions50
target_pctTarget Percentage70

How It Works

How to Calculate Questions Needed Right

Determine the minimum number of correct answers to meet a target percentage.

Formula

Questions Needed = ceil(Total Questions x Target % / 100)

We round up because you cannot answer a fraction of a question correctly.

Worked Example

A test has 50 questions and you need 70% to pass.

total_questions = 50target_pct = 70
  1. 01Exact number = 50 x 70 / 100 = 35
  2. 02Questions needed correct = ceil(35) = 35
  3. 03Questions you can miss = 50 - 35 = 15

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