How to Convert T-Scores to Percentiles

By Kenrick Callwood; Updated April 24, 2017

T-Scores are mostly used on standardized psychological tests and some medical tests. The scores are designed so that a score of 50 is considered average and the standard deviation is 10. These scores are easily converted into other standardized measurements. You may use a standardized score conversion chart to convert T-scores to percentiles for example. These charts are widely available online and make the conversion a simple task that anyone may perform.

Open a score conversion table in your Internet browser (see Resources).

Locate the line that shows the T-score you wish to convert.

Trace the line to the percentile column to see the corresponding percentile.

About the Author

Kenrick Callwood has been involved in Internet marketing since 2007 and his work has appeared in numerous online publications. His main areas of expertise are psychology, travel and Internet marketing. He holds a bachelor's degree in psychology from California Polytechnic University.