How are Lexile® scores computed?

Document created by Community User on Sep 18, 2017Last modified by Community User on Aug 20, 2018
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How are Lexile® scores computed?

NWEA Research collaborated with MetaMetrics (developers of the Lexile) to develop an algorithm to calculate the Lexile measure and range from the RIT scale. We improved the precision and range of our link to the Lexile scale through a new linking study, effective Fall 2018. The formula to correlate RIT scores and Lexile measures is not publicly available.

How can I determine a students Lexile measure from the Lexile range given in reports?

The Lexile range is a 150 point range. The student's Lexile measure is 100 points from the low end of the range, and 50 points from the high end of the range. For example, if a student's Lexile range is 200-350, their Lexile measure is 300.

See also:
Lexile® is a trademark of MetaMetrics, Inc., and is registered in the United States and abroad.

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