🔎 SEO

Readability Score Checker

Score text with Flesch Reading Ease and Flesch-Kincaid Grade Level.

Results

Result

📊 Readability Score Checker chart

Visual summary of your results.

What is the Readability Score Checker?

Score text with Flesch Reading Ease and Flesch-Kincaid Grade Level. Flesch Reading Ease and Flesch-Kincaid grade level estimate how easy text is to read, helping writers match their audience.

Readability Score Checker – free online seo tool illustration
Readability Score Checker — free, exact and private.

How to use the Readability Score Checker

  1. Paste or type your your text into the box (a sample is pre-filled so you can see how it works).
  2. Results update automatically as you type; you can also press Calculate.
  3. Read the output: result.
  4. Use the 📊 chart to see the result visually, then copy or share it.

Formula and method

FRE = 206.835 − 1.015 (words/sentences) − 84.6 (syllables/words) FKGL = 0.39 (words/sentences) + 11.8 (syllables/words) − 15.59

Where the Readability Score Checker helps in real life

You wrote a landing page and want customers to understand it quickly. The score highlights whether sentences and words are too long.

You are preparing safety instructions for a broad audience. Checking the grade level helps keep wording accessible.

Common mistakes to avoid

  • Chasing a perfect score at the expense of meaning.
  • Ignoring your audience’s expertise.
  • Over-simplifying technical terms that readers need.
  • Writing long sentences joined by commas.

💡 Practical tip: Readability scores are guides — clarity for your specific readers matters more than the number.

Illustration: a website owner’s desk with a laptop showing search traffic
Readability Score Checker in everyday work — illustration.

Tips for better results

  • Split long sentences into two.
  • Prefer common words over jargon.
  • Use headings and bullet points to break up text.

Frequently asked questions

What does the Readability Score Checker do?

Score text with Flesch Reading Ease and Flesch-Kincaid Grade Level.

How is it calculated?

The Readability Score Checker uses this method: FRE = 206.835 − 1.015 (words/sentences) − 84.6 (syllables/words); FKGL = 0.39 (words/sentences) + 11.8 (syllables/words) − 15.59.

Is the Readability Score Checker accurate?

Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.

Is this tool free and private?

Yes — the Readability Score Checker is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.

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