Education calculator
Test Score Percentile Calculator
Estimate percentile rank from a score, average, and 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.
FAQs
Is percentile exact?+
No. It is an estimate based on a normal distribution.
How does the Test Score Percentile Calculator calculate the result?+
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?+
Estimate percentile rank from a score, average, and standard deviation.
How accurate is the Test Score Percentile Calculator?+
Test Score Percentile Calculator applies the formula and assumptions shown on this page. Results may be rounded for readability, so verify changing rates, thresholds, medical guidance, or legal rules with the cited source or a qualified professional.
What should I check before using the Test Score Percentile Calculator result?+
Check that the units, dates, rates, and assumptions match your situation. Change one input at a time to understand which values have the largest effect on the result.
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
Enter your details
Enter a score, average, and standard deviation, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the normal percentile estimate: z = (score - mean) / standard deviation.
- 3
Compare scenarios
Change one or more inputs to see how they affect the test Score Percentile Calculator result before you use the estimate.
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