The Powers-Sumner-Kearl readability formula is most often used in assessing materials intended for use in the primary grades, through the third grade level.
The formula takes into consideration: (1) the total number of words, (2) the number of syllables, and (3) the total number of sentences.
Both
Readability Calculations and
Readability PLUS display this formulas scoring results on a screen which
may contain other formula results as well.