Test Accuracy Calculator Formula

Understand the math behind the test accuracy calculator. Each variable explained with a worked example.

Use the Test Accuracy Calculator

Formulas Used

Accuracy Percentage

accuracy = (correct / total) * 100

Incorrect Answers

incorrect = total - correct

Error Rate

error_rate = ((total - correct) / total) * 100

Variables

VariableDescriptionDefault
correctCorrect Answers42
totalTotal Questions Attempted50

How It Works

How to Calculate Test Accuracy

Test accuracy is the percentage of questions answered correctly.

Formula

Accuracy = (Correct Answers / Total Questions) x 100

This measures how precisely a student answers questions, focusing on quality rather than completion.

Worked Example

A student answers 42 out of 50 questions correctly.

correct = 42total = 50
  1. 01Accuracy = (42 / 50) x 100 = 84%
  2. 02Incorrect answers = 50 - 42 = 8
  3. 03Error rate = (8 / 50) x 100 = 16%

Ready to run the numbers?

Open Test Accuracy Calculator