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The Flesch Grade Level Readability Formula
Flesch Grade Level Readability Formula improves upon the Flesch Reading Ease Readability Formula. Rudolph Flesch, an author, writing consultant, and the supporter of Plain English Movement, is the co-author of this formula along with John P. Kincaid. Thats why it is also called Flesch-Kincaid Grade Level Readability Test. Raised in Austria, Flesch studied law and earned a Ph.D. in English from the Columbia University. Flesch, through his writings and speeches, advocated a return to phonics. In his article, A New Readability Yardstick, published in the Journal of Applied Psychology in 1948, Flesch proposed the Reading Ease Readability Formula.
** ( Use our free Flesch Grade Level Calculator to grade your text using the Flesch Grade Level formula).
In 1976 the US Navy modified the Reading Ease formula to produce a grade-level score by applying the Flesch Grade-Scale formula, or the Kincaid formula. John P. Kincaid was assisted by Fishburne, Rogers, and Chissom, in his research.
This formula is known by different names, like Flesch-Kincaid Index, Flesch-Kincaid Grade Level Score, Flesch-Kincaid Scale, Flesch-Kincaid Score, Flesch-Kincaid Readability Score, Flesch-Kincaid Readability Statistics, Flesch-Kincaid Grade Level Index, Flesch-Kincaid Readability Index, Flesch-Kincaid readability equation, and so on.
Originally formulated for US Navy purposes, this Formula is best suited in the field of education.
The Flesch-Kincaid Grade Level Readability Formula
Step 1: Calculate the average number of words used per sentence.
Step 2: Calculate the average number of syllables per word.
Step 3: Multiply the average number of words by 0.39 and add it to the average number of syllables per word multiplied by 11.8.
Step 4: Subtract 15.59 from the result.
The specific mathematical formula is:
FKRA = (0.39 x ASL) + (11.8 x ASW) - 15.59
FKRA = Flesch-Kincaid Reading Age
ASL = Average Sentence Length (i.e., the number of words divided by the number of sentences)
ASW = Average number of Syllable per Word (i.e., the number of syllables divided by the number of words)
Analyzing the results is a simple exercise. For instance, a score of 5.0 indicates a grade-school level; i.e., a score of 9.3 means that a ninth grader would be able to read the document. This score makes it easier for teachers, parents, librarians, and others to judge the readability level of various books and texts for the students.
Theoretically, the lowest grade level score could be -3.4, but since there are no real passages that have every sentence consisting of a one-syllable word, it is a highly improbable result in practice.
The US Government Department of Defense uses Flesch-Kincaid Grade Level formula as a standard test.
** ( Use our free Flesch Grade Level Calculator to grade your text using the Flesch Grade Level formula)