Readability Score
FreeFlesch-Kincaid, Gunning Fog, and Coleman-Liau readability scoring
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How it works
1
Paste
Paste your text into the editor to calculate readability scores automatically.
2
Analyze
Review scores from multiple formulas including Flesch-Kincaid, Gunning Fog, and Coleman-Liau.
3
Simplify
Rewrite flagged sentences to lower the reading level and make your content more accessible.
Frequently asked questions
What readability formulas does this tool use?+
It calculates Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, Coleman-Liau Index, and SMOG Index. Each formula weighs sentence length and word complexity differently, giving you a rounded view.
What grade level should I aim for?+
For general web content, a grade level of 6 to 8 reaches the widest audience. Technical documentation can go higher, but even specialized content benefits from shorter sentences and simpler vocabulary.
Are the scores accurate for non-English text?+
These formulas are designed for English and rely on English syllable patterns. Word and sentence counts will work for other languages, but the grade level and readability scores will not be meaningful.
Is my text processed on a server?+
No. All readability calculations run entirely in your browser using standard algorithms. Your text never leaves your device, so you can safely analyze unpublished or sensitive content.
Why do different formulas give different scores?+
Each formula measures different aspects of complexity. Flesch-Kincaid emphasizes syllables per word, Gunning Fog counts complex words, and Coleman-Liau uses character count. Comparing them gives a more complete picture.