Start with the label
A book page may show several kinds of reading data, but they do not belong to one shared scale. Compare a Lexile Text Measure with another Lexile value, an ATOS Book Level with another ATOS value, or a Fountas & Pinnell Text Level with another F&P level.
A measure describes one feature of the text. It is not a test score for your child, and it cannot decide by itself whether a book will be a good fit.
Compare like with like
A Lexile Text Measure describes text complexity, while an ATOS Book Level describes readability on the ATOS scale. Fountas & Pinnell Text Level places a text on an A to Z gradient using several text characteristics. The values are not interchangeable, and there is no simple conversion that preserves every difference between the systems.
Format still matters. Illustrations, vocabulary, sentence structure, and how much a child already knows about the subject can all change the reading experience.
What the AR fields mean
AR Interest Level is an age or grade-band guide based on a book's content. It is not a measure of reading difficulty. A child may be able to read the words in a book even when its subject matter is intended for older readers.
AR Points show how many points a book is worth in Accelerated Reader. The points a student earns depend on the quiz score. They are not a reading level, quality score, or recommendation. Word Count tells you the length of the text. It is useful context, but it does not measure difficulty on its own.
Where CEFR fits
CEFR describes language proficiency and is most useful for books chosen by English learners. It is not a Lexile, ATOS, or Fountas & Pinnell equivalent.
Use the number with the book
A blank field means that no number appears for the book here. It does not tell you whether the book is easy or difficult.
Use the description, format, and reading-list context alongside any available measures. A few pages read together will usually tell you more than one number can.