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What is a Lexile® measure?

A Lexile measure represents the complexity of a text, such as a book or article.  Lexile measures are expressed as numeric measures followed by an 'L' (for example, 850L), and are placed on the Lexile scale.  The Lexile scale is a developmental scale for measuring reader ability and text complexity, ranging from below 200L for beginning readers and beginning-reader materials to above 1600L for advanced readers and materials.

NEW!  Lexile measure is now provided for books at the Grade K-2 level to allow for a greater differentiation at the beginner level.  Our previously Lexiled materials have been updated to meet the new Lexile framework.
Visit for more information.


Text Complexity Grade Band in the Standards Old Lexile Ranges Lexile Ranges Aligned to CCR expectations
K-1 N/A N/A
2-3 450-725 450-790
4-5 645-845 450-790
6-8 860-1010 955-1155
9-10 960-1115 1080-1305
11-CCR 1070-1220 1215-1355