Originally Posted by polarbear
Is Diary of a Wimpy Kid considered a 5th grade book?

The Wimpy Kid series have accelerated reader ratings ranging from 5.2 to 5.8 and lexile measures of 950 to 1060. This does make them 5th grade books. Kind of (there are plenty of different ways to map grade level expectations to AR/Lexile, most of them slightly contradictory: http://library.springbranchisd.com/sbisd_library/reading_levels_comparison_chart.htm).

They are also short, clocking 3.0 AR point each (or about 20,000 words) which makes them sort of HiLo books -- they are harder than they look, but because they are short slower readers will be able to enjoy them.

Originally Posted by polarbear
By the time they were in 5th grade they'd moved on to books with much smaller font and less white space like Percy Jackson (although those were also 4th grade books for in-class reading at school too)

But Percy Jackson *is* a 4th grade book -- the Lightning Thief has an AR rating of 4.7 and a lexile measure of 740. The difference is the length, over four times longer than the Wimpy Kid books.