Dale-Chall Readability Formula
Also known as: Dale-Chall readability, Dale-Chall readability score,
The Dale-Chall readability formula computes a raw score, called the Reading Grade Score (RGS), which rates text on a U.S. grade-school level based on the average sentence length and the number of unfamiliar words, using the list of 3,000 words commonly known by 4th grade students.