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Readability Calculator

Measure how hard a text is to read with six well known readability formulas.

Check readability

Readability scores will appear here.
Paste some text to begin.
Syllables are estimated with a rule-based counter, so scores are close approximations.

How to use the Readability Calculator

  1. Paste the text you want to measure.
  2. Pick the audience you are writing for.
  3. Click Calculate and read the six scores plus the interpretation line.

Features

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Frequently Asked Questions

Common questions about the free online readability calculator.

Paste your text and click Calculate. Six standard formulas are applied at once and each score comes with the scale it uses.
Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, SMOG, Coleman-Liau and the Automated Readability Index.
A rule-based counter groups vowels, removes a silent final e and adds a syllable for endings such as le, with a short list of common exceptions.
It is close but not perfect. Unusual words and names can be counted one syllable out, which shifts the scores slightly.
Sixty to seventy reads as plain English for most adults, while ninety and above suits a young or general audience.
It estimates the years of schooling a reader needs, based on sentence length and the share of words with three or more syllables.
Each one weights sentence length, syllables, letters or long words differently, so small gaps between the scores are normal.
No. Your text is only measured. The scores and the statistics line update while you type or paste.
No. Every calculation runs in your browser, so your writing never leaves your device.

Last updated: October 10, 2026