Lexile Measures

Article about research into the benefits of extensive reading

Lexile Measures

A book, article or piece of text gets a Lexile text measure when it’s analyzed by MetaMetrics. For example, the first “Harry Potter” book measures 880L, so it’s called an 880 Lexile book. A Lexile text measure is based on two strong predictors of how difficult a text is to comprehend: word frequency and sentence length. Many other factors affect the relationship between a reader and a book, including its content, the age and interests of the reader, and the design of the actual book. The Lexile text measure is a good starting point in the book-selection process, with these other factors then being considered. Lexile text measures are rounded to the nearest 10L. Text measures at or below 0L are reported as BR for Beginning Reader.

Typical Reader Measures, by Grade

Grade Reader Measures, Mid-Year
25th percentile to 75th percentile (IQR)
1 Up to 300L
2 140L to 500L
3 330L to 700L
4 445L to 810L
5 565L to 910L
6 665L to 1000L
7 735L to 1065L
8 805L to 1100L
9 855L to 1165L
10 905L to 1195L
11 and 12 940L to 1210L

So a typical Year 6 child (grade 5) would have a lexile measure of 565L to 910L

To find out more about lexile measures, and to access a database of books with lexile measures, go to http://www.lexile.com/


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