Readability Checker
Check the reading level of any text using Flesch-Kincaid and Gunning Fog formulas. See grade level, reading ease score, and improvement tips.
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Requires at least 10 words
Why Readability Score Affects SEO and Engagement
Google's search quality guidelines explicitly mention readability as part of 'helpful content.' Pages that are unnecessarily complex or jargon-heavy signal low quality to visitors — they leave quickly (high bounce rate), which is a negative dwell-time signal.
Research by Nielsen Norman Group shows that users typically read only 20–28% of text on a web page. Shorter sentences, common words, and clear structure dramatically increase the portion they retain. Aiming for a Flesch Reading Ease score above 60 (roughly 8th grade level) is the sweet spot for most web content.
Who Uses a Readability Checker
Bloggers & Content Writers
Checking that blog posts hit a readable level (Flesch score >60) before publishing. High readability = lower bounce rates.
Teachers & Educators
Verifying that teaching materials, worksheets, and assignments match the target grade level of their students.
Technical Writers
Simplifying documentation, user guides, and help articles so they're accessible to non-expert users.
SEO Specialists
Auditing existing content for readability as part of a content quality improvement strategy for Google rankings.
How to Check Your Text's Readability
- Paste or type your text into the input area.
- The readability scores update automatically as you type.
- Review your Flesch Reading Ease score (higher = easier to read), Gunning Fog Index, and estimated grade level.
- Check the suggestions panel for specific feedback: sentences that are too long, or words above 3 syllables.
- Revise your text and watch the scores improve in real time.
Target Readability Scores by Content Type
Use these benchmarks to set the right readability targets for your writing:
• Blog posts / marketing copy: Flesch Reading Ease 60–70 (Grade 8–9)
• News articles: Flesch Reading Ease 50–60 (Grade 10–11)
• Business reports: Flesch Reading Ease 40–50 (Grade 11–12)
• Academic journals: Flesch Reading Ease 20–40 (College+)
The fastest way to improve readability: break long sentences (>25 words) into two shorter ones, replace complex words with simpler synonyms, and use active voice instead of passive voice.
How Readability Formulas Are Calculated
Flesch Reading Ease (FRE): 206.835 - (1.015 × avg words per sentence) - (84.6 × avg syllables per word). Higher scores (0–100) mean easier reading. A score of 70+ is considered easy; below 30 is very difficult.
Flesch-Kincaid Grade Level: 0.39 × (avg words/sentence) + 11.8 × (avg syllables/word) - 15.59. Returns an approximate US school grade level (e.g., 8.0 = 8th grade).
Gunning Fog Index: 0.4 × [(words/sentences) + 100 × (complex words/words)]. Complex words = words with 3+ syllables. A score above 12 means the text is difficult for most readers.