The automated readability index (ARI) is a readability test designed to gauge the understandability of a text. Like the Flesch–Kincaid grade level, Gunning fog index, SMOG index, Fry readability formula, and Coleman–Liau index, it produces an approximate representation of the US grade level needed to comprehend the text.
The formula for calculating the automated readability index is given below:
where characters is the number of letters, numbers, and punctuation marks, words is the number of spaces, and sentences is the number of sentences. Sentences were counted by hand as each text was typed...