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Readability Score Calculator

Text

Score pasted text with Flesch Reading Ease, Flesch-Kincaid Grade Level, and Gunning Fog Index

Paste a paragraph of documentation, marketing copy, or a blog draft and get three standard readability scores back at once: Flesch Reading Ease, Flesch-Kincaid Grade Level, and the Gunning Fog Index, along with the word, sentence, and syllable counts behind them. It's a quick sanity check before publishing something meant for a general audience, since a piece that scores in the college-graduate range often just needs shorter sentences or simpler word choices, not a full rewrite. Syllables are counted with a heuristic vowel-group approach rather than a dictionary lookup, so scores are a close estimate rather than a linguistically exact count, the same tradeoff most readability tools make in exchange for running instantly on any text with no external word list.

readabilitygrammarwritingfleschgrade-level

How to use Readability Score Calculator

  • 1.Paste a paragraph of documentation or marketing copy to see its Flesch Reading Ease, Flesch-Kincaid Grade, and Gunning Fog scores at once.
  • 2.Use the grade-level scores to decide whether a piece needs shorter sentences or simpler words before it goes out to a general audience.
  • 3.Compare two drafts of the same paragraph to confirm an edit actually made the text easier to read, not just shorter.

Frequently asked questions

How accurate is the syllable counting?
It uses a heuristic vowel-group counter with adjustments for silent trailing 'e' and '-le' endings, which is accurate for the vast majority of English words but isn't a dictionary lookup, so unusual words can be off by a syllable.
What's a good Flesch Reading Ease score to aim for?
60-70 reads as 'standard, easy to understand' for most general audiences; technical documentation often lands lower, and that's fine as long as the audience expects it.
Is my text sent to a server?
In the browser tool, no, scoring runs entirely client-side using pattern matching, nothing is uploaded anywhere.
Does a low score always mean bad writing?
Not necessarily, these formulas measure sentence and word length, not clarity or correctness, so a technical explainer can score 'difficult' while still being well-written for its intended audience.

Use via API, SDK, or MCP

cURLcurl "https://api.utilix.tech/v1/tools/readability-score" \
  -H "Authorization: Bearer utx_live_..."
# Free: 1,000 req/day · Pro: 10,000 req/day

Get an API key from your dashboard · Full API docs →

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