A Lexile measure is a number that captures how technically difficult a text is to read, based on word frequency and sentence length. It is not a measure of grade level proficiency, nor of ease of comprehension. I use it to estimate how difficult a text may be to read.
200-300 a very easy first step reader
400-500 more complex with a real story or maybe early chapters
700-800 real chapter books with complex plots, generally for the proficient elementary school reader
>1000 an adult level book
That being said, there are a LOT of outliers. I mostly use Lexiles to rule out books that will be too easy, than to rule out books that may or may not be too hard. This is because a lot of perfectly good early chapter books have complex sentence structure or vocabulary while at the same time having juvenile content and complexity of plot.
See www.lexile.com for more information.
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