The Gunning Fog Index is a readability formula that measures the complexity of a text. It considers sentence length and the number of complex words to determine the grade level needed to understand the text. The formula is as follows: Gunning Fog Index = (Number of words with 3-syllables or more) | ᴺᵂ = number of total words.

https://readabilityformulas.com/the-gunnings-fog-index-or-fog-readability-formula/

https://readabilityformulas.com/the-gunnings-fog-index-or-fog-readability-formula/