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Readability Scores
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Flesch Reading Ease
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Flesch-Kincaid Grade
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Gunning Fog Index
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SMOG Grade
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0 Very Difficult30 Difficult60 Standard80 Easy100 Very Easy
Enter text to see the Flesch Reading Ease score on this scale.
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Complex Words Found
Words with 3 or more syllables — consider simplifying where possible:
Target Audience Guide
Readability and SEO
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Google does not use readability scores as a direct ranking factor. However, readability strongly correlates with SEO performance indirectly: easier text has longer dwell time (users stay on page), lower bounce rate, more social shares, and more natural backlinks. For most web content targeting general audiences, aim for Flesch Ease score of 60–70 (Standard) or Flesch-Kincaid Grade 7–8. For technical or professional audiences, higher complexity is appropriate.
Use the Readability Checker above — enter your values and get instant results. This free online tool calculates readability checker free online without any download or signup required. Results update in real time as you type.
Use the Readability Checker above — enter your values and get instant results. This free online tool calculates how to check reading level of text without any download or signup required. Results update in real time as you type.
Flesch Reading Ease (developed by Rudolf Flesch in 1948) scores text on a 0–100 scale based on average sentence length and average syllables per word. Formula: 206.835 − 1.015 × (words/sentences) − 84.6 × (syllables/words). Score interpretation: 90–100 = very easy (5th grade, comic books), 70–80 = easy (7th grade, popular fiction), 60–70 = standard (8th–9th grade, most web content), 50–60 = fairly difficult (10th–12th grade, academic), 30–50 = difficult (college level), 0–30 = very difficult (professional journals).
For general consumer content and blog posts: Grade 6–8 (Flesch Ease 60–70). The average American reads at a 7th–8th grade level. For e-commerce product descriptions: Grade 5–7. For news articles: Grade 7–8 (major newspapers target Grade 8). For technical documentation aimed at professionals: Grade 10–14 is appropriate. For medical or legal content for laypeople: Grade 6–8 despite complex subject matter — plain language laws in many countries require government documents at Grade 8 or below.
The Gunning Fog Index (developed by Robert Gunning in 1952) estimates the years of formal education needed to understand a text on first reading. Formula: 0.4 × ((words/sentences) + 100 × (complex words/words)). Complex words = words with 3+ syllables (excluding proper nouns, compound words, common suffixes like -ed, -es, -ing). Score interpretation: 6 = easily understood (6th grade), 8 = ideal for popular media, 12 = acceptable for high school, 17 = understood by college graduates only, 20+ = very difficult (technical/academic journals).
Most effective techniques: 1) Shorten sentences — aim for average 15–20 words per sentence. Break sentences over 25 words into two. 2) Use simple words — 'use' instead of 'utilise', 'help' instead of 'facilitate', 'show' instead of 'demonstrate'. 3) Use active voice — 'We launched the product' not 'The product was launched by us'. 4) Short paragraphs — 2–4 sentences maximum. 5) Use subheadings frequently. 6) Avoid jargon unless your audience is technical. 7) Spell out acronyms on first use.
Yes — Yoast SEO Premium includes a readability analysis that checks: Flesch Reading Ease (aims for 60+ for general content), passive voice (recommends less than 10% of sentences), sentence length distribution, paragraph length, subheading distribution, and transition word usage. Getting a green light from Yoast readability does not guarantee SEO success, but it helps ensure your content is accessible and structured in a way that both readers and Google can easily parse.