Flesch-Kincaid Grade Level
A number estimating the US school grade needed to read a passage, based on sentence length and syllables per word.
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What it is
Flesch-Kincaid Grade Level estimates the US school grade needed to read a passage. Its formula combines average sentence length with average syllables per word. A result near 8 points to roughly an eighth-grade reading level, not a reader's intelligence or the quality of the ideas. It was built in 1975 for the US Navy, which needed to know whether its technical manuals matched the reading level of the sailors issued them.
Reach for it when you need a repeatable readability target across help content, public information, onboarding, or policy copy. Microsoft Word reports it in its readability statistics, and most writing tools run the same arithmetic. It is useful for comparing drafts because it exposes two common sources of friction: long sentences and multisyllabic words.
Gotcha: the number cannot judge meaning, structure, or whether a necessary technical term is explained. Different tools can also count sentences and syllables differently. Use the score as a smoke alarm, then read the passage like a person.
Ask AI for it
Calculate this passage's Flesch-Kincaid Grade Level with the standard formula: 0.39 x words per sentence + 11.8 x syllables per word - 15.59. Report the word, sentence, and syllable counts, then rewrite the passage to grade 8 or below without removing necessary technical terms or facts. Recalculate the revised score and show both versions in a table. Flag any word whose syllable count is uncertain. Show the syllable count per word in a list before summing, then confirm the result with the textstat Python library's flesch_kincaid_grade.