FKGL
FKGL stands for Flesch–Kincaid Grade Level, a readability metric designed to estimate the US school grade level needed to understand a piece of English text. It is commonly used in education, publishing, and software to gauge text difficulty and tailor content to a target audience.
The FKGL is calculated from three counts of the text: words, sentences, and syllables. The standard formula
Historically, the Flesch–Kincaid readability tests were developed in the 1970s by Rudolf Flesch and J. Peter
Interpretation guidance suggests that lower FKGL values correspond to easier text, while values around 8–12 are
Limitations include a focus on syntactic and lexical features rather than content quality or reader motivation,