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Score text with Flesch-Kincaid, grade level, and sentence highlights
Enter at least 5 words to analyze
Scores appear here as you type
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Browse SEO TemplatesReadability formulas translate text complexity into objective scores. Flesch Reading Ease combines average sentence length and syllables per word into a 0-100 score. Flesch-Kincaid Grade Level maps to US school grades. Gunning Fog adds complex word ratio.
The tool splits text into sentences and words. Syllables are counted per-word using a vowel-cluster heuristic. Three readability formulas run against the aggregated counts. All computation runs in the browser.
A content marketer checks a blog post before publishing and breaks long sentences to bring the Flesch score above 65.
A technical writer discovers 40% passive voice and rewrites to make instructions clearer.
An email marketer tests copy to ensure it reads at a 7th-grade level for maximum open rates.
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Scores update in real-time as you type or paste
Aim for Flesch Reading Ease 60+ for general audiences
Check highlighted hard sentences and simplify them
About the Readability Checker
60-70 is Standard. 70-80 is Fairly Easy (most blog content). 80-90 is Easy. Scores below 50 are considered difficult and suit academic writing only.
Years of formal education needed to understand the text. Aim for under 12 for general web content.
The tool scans for forms of "to be" followed by past participles. The percentage is passive instances divided by total sentences.
Sentences exceeding 25 words or with 30%+ complex words (3+ syllables) are flagged — comprehension drops sharply beyond these thresholds.
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