What is a Lexile® Measure?

A Lexile measure is a valuable piece of information about either an individual's reading ability or the difficulty of a text, like a book or magazine article. The Lexile measure is shown as a number with an "L" after it — 880L is 880 Lexile.

A student gets his or her Lexile reader measure from a reading test or program. For example, if a student receives an 880L on her end-of-grade reading test, she is an 880 Lexile reader. Higher Lexile measures represent a higher level of reading ability. A Lexile reader measure can range from below 200L for beginning readers to above 1700L for advanced readers. Readers who score at or below 0L receive a BR for Beginning Reader.

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.

The idea behind The Lexile Framework for Reading is simple: if we know how well a student can read and how hard a specific book is to comprehend, we can predict how well that student will likely understand the book.

When used together, Lexile measures help a reader find books and articles at an appropriate level of difficulty (visit Find a Book ), and determine how well that reader will likely comprehend a text. You also can use Lexile measures to monitor a reader's growth in reading ability over time.

How to get a Lexile® Measure

Students can receive a Lexile measure from many different reading tests and programs