Tool4SaaS

Readability Checker

Check Flesch-Kincaid grade levels and reading ease scores. Analyze sentence length to write clearer, more accessible copy.

Readability Scores

Flesch Reading Ease

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Flesch-Kincaid Grade Level

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Words
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Syllables
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Avg Words / Sentence
Sentences: 0Avg Syllables / Word: —
Flesch Reading Ease: 206.835 − 1.015×(words/sentences) − 84.6×(syllables/words) · Flesch-Kincaid Grade: 0.39×(words/sentences) + 11.8×(syllables/words) − 15.59 · Syllables approximated via vowel groups.

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About the author

Written and maintained by the Tool4SaaS team. Every tool runs locally in your browser and is tested in-house for accuracy. Last updated: .

Frequently asked questions

Score 0-100: higher means easier. 60-70 is plain English, 90-100 is very easy.

FKGL = 0.39×ASL + 11.8×ASW −15.59, where ASL=avg sentence length, ASW=avg syllables per word.

Yes, it is free, works offline in your browser, and your data never leaves your device.

How to use Readability Checker

  1. Paste text: Paste your essay or article.
  2. View scores: See Reading Ease, grade level and sentence stats.
  3. Improve: Shorten sentences and simplify words to lower grade level.