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What a Lexile measure means

By Jasa Todorovich. Last updated Oct 2, 2026

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The short answer

A Lexile measure is a number followed by an L, such as 880L or 1010L. It places a reader and a text on one shared scale. That shared scale is the whole idea: the same number describes how well a student reads and how hard a book is, so the two can be matched directly.

It is published by MetaMetrics, not by the assessment that reports it. NWEA MAP Growth, among others, prints a Lexile range alongside the RIT score, which is where most teachers and families first meet one.

Reader measure and text measure

  • A reader measure comes from a reading test. It describes the student.
  • A text measure comes from analysing a book, article or passage for complexity. It describes the material.

Both are expressed in the same units, which is why a 880L reader and an 880L book are a meaningful pair. Two numbers on one scale is the entire product.

The range, and the code you may see instead of a number

A student measure runs from below 0L for early readers to above 2000L for advanced ones. A reader who scores below 0L is reported as BR, for Beginning Reader, rather than as a negative number.

So a BR result is not a missing score or an error. It is the scale's way of saying the student is at the earliest end of it.

The number to actually use: the reading range

A single Lexile is a centre point, not a target. MetaMetrics recommends looking for material in a band around the reported measure, from 100L below it to 50L above it, which they describe as the comprehension "sweet spot".

The asymmetry is the useful part. The band reaches further down than up, because reading slightly below your measure builds fluency, while reading far above it stalls comprehension. A student measured at 800L is best served somewhere between 700L and 850L.

This is also why a report showing a range rather than one number is showing you the more usable figure.

The Lexile range on a MAP Growth report

On an NWEA MAP Growth reading test, the Lexile range appears on most class and student reports. NWEA describes the Lexile measure there as an estimate based on the student's RIT score, so it is not a separate test, and it moves when the reading RIT moves.

The range is the same reading band described above. To get the single measure back from a report that prints only the range, add 100L to the low end, or subtract 50L from the high end. NWEA's own example is a range of 20L to 170L, which is a Lexile measure of 120L.

A BR code reads the opposite way from an ordinary number. The figure after BR counts how far below 0L the reader sits, so in NWEA's example a reader at BR160L is more advanced than a reader at BR400L.

A student who also takes NWEA's MAP Reading Fluency gets a second Lexile figure, and the two are meant to differ. MAP Growth reports a reading comprehension measure; MAP Reading Fluency reports an oral reading measure, which reflects reading aloud and does not measure comprehension. Both sit on the same scale, so NWEA suggests comparing them: an oral reading measure above the comprehension measure can point to a student who reads quickly and accurately without attending to meaning.

What a Lexile does not tell you

It is not a grade level. Lexile measures text complexity and reading ability, not age-appropriateness. A book can sit comfortably inside a nine-year-old's Lexile range and be entirely wrong for a nine-year-old on subject matter. The measure says nothing about content, theme or maturity, and it was never meant to.

It is not a reading list. Matching on the number alone ignores interest, background knowledge and motivation, which move comprehension at least as much as complexity does.

It is not comparable to a RIT score. A RIT is NWEA's own achievement scale; a Lexile is MetaMetrics' reading-and-text scale. A test may report both, but they are separate measurements and cannot be averaged or converted by eye.

Frequently asked questions

What is a Lexile score?

A measure of reading ability, written as a number followed by L, on the same scale used to measure how difficult a text is.

What is a good Lexile score?

There is no single good number, because a Lexile is not a grade level. Compare it to the range the student's own school or assessment reports for their grade, and watch whether it moves over time.

What does BR mean on a Lexile report?

Beginning Reader. It is what the scale reports instead of a negative number for a reader measuring below 0L.

What is the highest Lexile measure?

Student measures run above 2000L at the advanced end of the scale.

What books should my child read at their Lexile measure?

MetaMetrics recommends a band from 100L below the measure to 50L above it. Inside that band, choose on interest and subject matter. The measure cannot tell you whether a book is appropriate, only how hard it is to read.

What is the Lexile range on a MAP test?

The reading band MAP Growth reports beside a reading result, an estimate based on the student's RIT score. It runs from 100L below the student's Lexile measure to 50L above it, so adding 100L to the low end gives the measure itself.

Why do MAP Growth and MAP Reading Fluency give different Lexile measures?

They measure different things. MAP Growth reports reading comprehension, MAP Reading Fluency reports oral reading. A gap between the two describes the student, it is not an error in either test.

Who publishes Lexile measures?

MetaMetrics Inc. Assessments such as NWEA MAP Growth report a Lexile range; they do not define the scale.

Sources

Lorsey is not affiliated with or endorsed by MetaMetrics or NWEA. Lexile is a trademark of MetaMetrics Inc.; MAP Growth and MAP Reading Fluency are trademarks of NWEA. Both are used here to describe measures a school already receives.