Fry Readability Formula

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A rendition of the Fry Graph.
A rendition of the Fry Graph.

The Fry Readability Formula (or Fry Readability Graph) is a readability metric for English texts, developed by Dr. Edward Fry.

The grade reading level (or reading difficulty level) is calculated by the average number of sentences and syllables per hundred words. These averages are plotted onto a specific graph; the intersection of the average number of sentences and the average number of syllables determines the reading level of the content.

The formula and graph are often used to provide a common standard by which the readability of documents can be measured. It is sometimes used for regulatory purposes, such as in healthcare, to ensure publications have a level of readability that is understandable and accessible by a wider portion of the population.

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