Readability Score

Analyse text readability with Flesch-Kincaid, Gunning Fog, and SMOG scores.

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How it works

Paste your text and the tool counts sentences, words, and syllables (using a heuristic vowel-group counter). From those counts it computes four standard formulas: Flesch Reading Ease (higher = easier to read), Flesch-Kincaid Grade Level (US school grade), Gunning Fog Index (years of education needed), and SMOG Index (also grade-based, focusing on polysyllabic words). Everything runs in your browser — your text is never uploaded.

Common use cases

  • Simplifying a blog post or email so a general audience can follow it.
  • Checking that patient-facing health content meets plain-language guidelines.
  • Verifying that legal or government text hits a target reading level.

Frequently asked questions

What reading ease score should I aim for?

Flesch Reading Ease of 60-70 is considered standard plain English, readable by most adults. Above 80 is very easy (children's books); below 30 is very difficult (academic journals).

How accurate is the syllable count?

The tool uses a heuristic (counting vowel groups) which is accurate for most common English words. Unusual words, acronyms, and non-English text may be counted slightly incorrectly.

Why do different tools give different scores?

All readability formulas are approximations based on word and sentence length. Minor differences in syllable counting or sentence boundary detection lead to small score variations.