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Readability checker

Readability checker is a text tool that scores prose against established readability metrics. It computes Flesch Reading Ease, Flesch-Kincaid grade level, Gunning Fog, and SMOG indexes, updates as you type, and includes estimated reading time. The tool runs in your browser.

Paste some text above to see readability stats.

Analysis modes

Direct links for each readability metric.

How to check text readability

  1. Paste your article, document, or copy into the input area.
  2. The tool calculates readability scores instantly, including Flesch Reading Ease and Grade Level.
  3. Review the metrics to understand how easy or difficult your text is to read.
  4. Edit your text and watch the scores update in real time.

Common uses

Technical specification

Frequently asked questions

What readability formulas are used?
The tool calculates Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, and SMOG Index, the four most widely used readability metrics.
What score should I aim for?
For general web content, a Flesch Reading Ease score of 60 to 70 is ideal. Academic writing typically scores lower, while children's content scores higher.
Is my text sent to a server?
No. All calculations run entirely in your browser.
How much text do I need for an accurate score?
Readability formulas work best with at least 100 words. Very short texts can produce unreliable scores.

Reviewed and tested May 25, 2026.