Two-syllable verbs turned into three syllables because of –es or –ed.To get the PHW, you must first count all the words in the sample passage with three or more syllables, provided that they are NOT: The formula for the FOG Index you need to use is:ĪSL is calculated by dividing the total number of words by the total number of sentences in the sample passage. Count exactly how many words and sentences you have. In a time where computers were not so commonplace, the Gunning FOG Readability Index was an easy and convenient method to use.īefore using the formula, you will need to choose a sample passage from your text, at least 100 words long or more. What makes the Gunning FOG Test so beloved by many is because it has a simplified formula and an equally simple method. If you want the general public to comprehend your text, it is a good idea to aim for a score of 8 since 8th grade English is the benchmark for conversational English. That means, if your text scored a 6 in the Gunning FOG Index, it could be understood by people who are in 6th Grade and above. Using the Gunning FOG formula, you can directly estimate the number of years of formal education a person needs to understand the text. It is best to get a sample passage of at least 100 words for this test. Gunning’s FOG Index highlights the number of words and syllables present in a text. So he and his associates devised a formula to test the readability of texts and called it the FOG Index. ![]() Newspapers and business documents use up a lot of 'fog' and needless complexity. Gunning has observed that many high school graduates had problems with reading, and a big problem with that was because of writing. Gunning was a well-known businessman who has knowledge about newspapers and publishing. ![]() It was formulated by Robert Gunning in the 1960s. A boom in readability tests occurred during the late 1900s, and one such test developed was the FOG Index.
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