Flesch-Kincaid Grade Level Calculator
Score your text live with six classic readability formulas: Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau and ARI.
Processed entirely in your browser — nothing you enter here is ever uploaded.
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About this tool
This page opens the readability checker with the Flesch-Kincaid Grade card highlighted — paste your text and the grade updates live with every keystroke.
The Flesch-Kincaid Grade Level maps a text to a US school grade: 0.39 × (words per sentence) + 11.8 × (syllables per word) − 15.59. A score of 8 means an average eighth-grader should follow it; most general-audience writing aims for 6-9.
The formula is calibrated for English and syllables are counted heuristically, so treat scores for other languages as indicative. The full tool also shows Flesch Reading Ease, Gunning Fog, SMOG, Coleman-Liau and ARI — all computed locally in your browser.
Example. The cat sat on the mat. is counted as 6 words and 1 sentence, and Flesch Reading Ease is clamped to 100 because the raw score sits above the scale.
Limit. Syllables are vowel groups plus a silent-e rule, so the six English formulas are not recalibrated for other languages.