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Readability Checker

The Readability Checker tells you how easy a web page is to read. It reports the reading grade level and Flesch score, the average sentence length, how much of the text is passive voice, and how large your paragraphs are. Use the results to find the long sentences, the passive phrasing and the heavy paragraphs worth fixing first.

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How to read the result

The headline is the reading grade of the page text. Under it you get the word and sentence counts, the Flesch score (higher is easier to read) and the average words per sentence.

The page needs at least 80 words of text. Below that the tool says there is not enough to measure.

What each check looks for

CheckPassWarning
Reading gradeGrade 10 or lowerGrade 11 to 13
Sentence length20 words or fewer on average21 to 25 words
Very long sentencesAbout 5% of sentences or fewer run past 28 wordsMore than that
Active voicePassive phrasing in 10% of sentences or fewerMore than that
ParagraphsAt least 1 substantial paragraph per 150 wordsFewer than that

Fixing a high grade

The grade comes mostly from sentence length and word length. For business writing the tool suggests aiming for grade 8 to 10.

  1. Split any sentence over 28 words into two.
  2. Swap long words for short ones where the meaning stays the same.
  3. Rewrite passive phrasing so the person or product doing the thing comes first.
  4. Break paragraphs that run past 5 or 6 lines.
  5. Run the page again and compare the grade.

When a high grade is fine

Pages with product names, technical terms or legal wording often score higher than the writing deserves. Lists and headings without full stops can also skew the numbers. Use the score to find the heaviest passages, then judge them yourself.

Common questions

The readability checker treats grade 10 or lower as a pass and suggests 8 to 10 for business writing. Technical pages can run higher if the audience expects it.
Google has not said reading grade is a ranking factor. Use the score to find passages that are hard to read.
A page can score a high reading grade and still read fine, since the score is based on sentence length and word length. Long product names, headings without full stops and lists can push it up.

Related study: What Do the Pages ChatGPT Cites on Specific Questions Look Like?

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