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Free Readability Score
Calculator

Free private readability calculator with Flesch, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau, ARI, LIX, RIX, language-specific formulas, sentence diagnostics, syllable overrides and before/after comparison.

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About Free Readability Score Calculator

Measure readability with multiple established formulas, see where they agree, inspect the hardest sentences, review syllable counts, compare revisions, and understand which variables are moving the score—all locally in your browser.

Workspace options

  • Interface language
  • Text language
  • Target band
  • Custom min grade
  • Custom max grade

Available actions

  • ☾ Dark
  • Load sample
  • Analyze readability
  • Save baseline
  • Open TXT / MD
  • Formula Lab