About the Test Score Calculator
Test score as a percentage, letter grade and position against the class average.
Also known as: quiz score calculator, test grade calculator, score out of total, class rank score.
How to use this calculator
- Enter correct answers, total questions, class average, standard deviation.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
score % = correct ÷ total × 100 · z = (score − mean) ÷ standard deviation
Worked example
Using the values pre-filled in the calculator above:
- Correct answers = 38
- Total questions = 45
- Class average = 72 %
- Standard deviation = 12
the calculator returns:
- Score: 84.44%
- Letter grade: B
- Correct: 38 of 45
- Wrong: 7