Free interactive student tool
Free T-Score and Percentile Converter
Free T-Score and Percentile Converter. Clarify that psychometric T-scores differ from a t-test statistic; support T-score, z-score and percentile relationships.
Immediate resultNo sign-up requiredTransparent methodOptional email copy
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z = (T − 50) ÷ 10; percentile = Φ(z)
How this tool reaches its result
The converter uses the conventional T-score mean of 50 and standard deviation of 10.
z = (T − 50) ÷ 10; percentile = Φ(z)
Worked context
How to interpret the output
T = 60 corresponds to z = 1 and approximately the 84th percentile in a normal distribution.
Important limitation
What the result cannot decide for you
Confirm that the assessment actually uses the conventional T-score scale and that percentile interpretation is appropriate.