Readability Checker
Analyze text readability with multiple scoring systems. Get detailed insights and suggestions to improve content accessibility.
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What You'll Get
All Readability Scores
Flesch Reading
Gunning Fog
SMOG Index
Coleman-Liau
Text Overview
Improvement Recommendations
How to Use the Readability Checker
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Understanding Readability Scores
What is Readability?
Readability measures how easy or difficult it is for readers to understand written text. It considers factors like sentence length, word complexity, and syllable count.
- • Flesch Reading Ease: 0-100 scale (higher = easier)
- • Flesch-Kincaid Grade: US school grade level
- • Gunning Fog: Years of education needed
- • Coleman-Liau: Character-based formula
Why Readability Matters
Good readability improves user engagement, SEO rankings, and ensures your content reaches the widest possible audience effectively.
- • SEO Benefits: Better user engagement signals
- • Accessibility: Inclusive content for all readers
- • Engagement: Readers stay longer on easy-to-read content
- • Conversion: Clear writing drives action
Flesch Reading Ease Score Interpretation
The classic 0–100 scale from Rudolf Flesch (1948). Higher scores are easier to read.
| Score | Readability | Grade Level | Typical Audience |
|---|---|---|---|
| 90–100 | Very easy | 5th grade | Children's books, simple marketing |
| 80–90 | Easy | 6th grade | Popular fiction, consumer content |
| 70–80 | Fairly easy | 7th grade | Magazines, most blog posts |
| 60–70 | Plain English | 8th–9th grade | Newspapers, general web content |
| 50–60 | Fairly difficult | 10th–12th grade | Business and technical writing |
| 30–50 | Difficult | College | Academic papers, legal documents |
| 0–30 | Very difficult | College graduate | Scientific journals, law reviews |
The Algorithms, Compared
Flesch Reading Ease — 206.835 − 1.015 × (words/sentences) − 84.6 × (syllables/words). The higher, the easier. Best for a quick general-audience gauge.
Flesch-Kincaid Grade Level — 0.39 × (words/sentences) + 11.8 × (syllables/words) − 15.59. Outputs a US school grade directly. Widely used in education and the military.
Gunning Fog Index — 0.4 × ((words/sentences) + 100 × (complex words/words)), where "complex" means 3+ syllables (excluding proper nouns). Emphasizes long words.
Coleman-Liau Index — 0.0588 × letters per 100 words − 0.296 × sentences per 100 words − 15.8. Counts characters instead of syllables, so it is more reliable for automated processing.
Target Scores by Content Type
- • Web copy & landing pages: Flesch 60–80, grade 7–9 — visitors scan, they don't study
- • News & blogs: Flesch 50–70 — plain language with room for topic-specific terms
- • Technical documentation: Flesch 40–60 is acceptable; clarity of structure matters more than the raw score
- • Academic & legal: Flesch 30–50 is normal, but always question whether the density is necessary
- • Marketing & UX writing: aim for Flesch 70+; every added grade level costs readers
Real-time Analysis
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Multiple Algorithms
Get comprehensive analysis using Flesch-Kincaid, Gunning Fog, Coleman-Liau, and more.
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Readability Checker FAQ
What is a good Flesch Reading Ease score?
For general web content, aim for 60–80 (plain English, roughly grade 7–9). Technical documentation can sit lower (40–60), while marketing copy should push higher. The interpretation table above breaks down every band.
Which readability formula should I trust?
Use Flesch Reading Ease as your primary gauge, then sanity-check with Flesch-Kincaid Grade Level. If they disagree strongly, your text probably mixes very short and very long sentences — the comparison table above explains each formula's bias.
Do readability scores affect SEO?
Indirectly. Search engines reward content that satisfies readers — dwell time and return visits correlate with clear writing. Scores are a diagnostic, not a ranking factor: optimize for humans first.
Why does my score change when I paste the same text twice?
It shouldn't. Syllable counting in English is heuristic (e.g., how "read" vs "reader" are counted). This tool uses a consistent algorithm, so identical input always yields identical output within the same browser.
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