There are numerous claims about the readability of various English Bible translations. The chart below is the result of my own calculations using the standard Flesch-Kincaid grade level formula. Many other readability calculations do not specify whether sentence lengths are based on punctuation or verse divisions. This tool allows you to see it either way. In some sections, the results are wildly different.
This tool also makes it easy to find readability levels for each author, book and chapter (on the advanced tab), unlike the more general readability comparisons you may have seen already. Due to copyright restrictions, it is difficult to obtain electronic versions of the entire text of translations other than the KJV, so at the moment we do not have a simple tool available for comparing readability accross different versions.
(chart may take a moment to load)