Education calculator

Test Score Percentile Calculator

Estimate percentile rank from a score, average, and standard deviation.

Formulaz = (score - mean) / standard deviation

Formula

Normal percentile estimate

This assumes scores are approximately normally distributed.

z = (score - mean) / standard deviation

A score one standard deviation above the mean is around the 84th percentile.

FAQ5 common questions for this calculator.

FAQs

Is percentile exact?+

No. It is an estimate based on a normal distribution.

How does the Test Score Percentile Calculator calculate the result?+

For the Test Score Percentile Calculator, it uses the Normal percentile estimate: z = (score - mean) / standard deviation. A score one standard deviation above the mean is around the 84th percentile.

What information do I need to use the Test Score Percentile Calculator?+

For the Test Score Percentile Calculator, enter a score, average, and standard deviation. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.

How accurate is the Test Score Percentile Calculator?+

Test Score Percentile Calculator is accurate for the scores, weights, credits, and grading scale entered. It applies the Normal percentile estimate. Official school policies may handle rounding, retakes, or credit weighting differently.

What should I check before using the Test Score Percentile Calculator result?+

For the Test Score Percentile Calculator, check a score, average, and standard deviation, grading scale, credit hours, target score, and institutional policy. Small weighting differences can change the final result.

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Education guide

How to use the Test Score Percentile Calculator

Estimate percentile rank from a score, average, and standard deviation. The page also explains the normal percentile estimate and shows a practical example: A score one standard deviation above the mean is around the 84th percentile.

  1. 1

    Enter your details

    Enter a score, average, and standard deviation, then complete any other fields shown in the calculator.

  2. 2

    Check the calculation

    Review the result alongside the normal percentile estimate: z = (score - mean) / standard deviation.

  3. 3

    Compare scenarios

    Change one or more inputs to see how they affect the test Score Percentile Calculator result before you use the estimate.