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A readability formula that estimates the US school grade level required to understand a text, based on average sentence length and syllables per word.
The Flesch-Kincaid Grade Level formula calculates: 0.39 × (total words / total sentences) + 11.8 × (total syllables / total words) − 15.59. A score of 8.0 means the text is understandable by an 8th-grade student. Most web content targets a grade level of 7-9 for maximum accessibility. The companion Flesch Reading Ease score inverts this — higher scores mean easier text. Both are standard metrics in readability analysis tools.