Flesch-Kincaid Calculator

Calculate readability from live sentence and word measurements, and see which sentences drive the grade. Free, no sign-up.

0 words

Tested against

  • Turnitin
  • GPTZero
  • Originality.ai
  • Copyleaks
  • ZeroGPT
  • Winston AI
  • Scribbr
  • Writer
  • Sapling
  • Crossplag
  • Content at Scale

Because the formula reduces to those two inputs, a grade level on its own hides everything actionable. The per-sentence view shows which specific sentences are pulling the average, which is what you would change.

Treat the grade as a rough comparator between drafts, not as a target. Writing tuned to hit a number tends toward uniform sentence length, and uniform sentence length is one of the clearest markers of machine-generated prose.

FAQ

It uses the same inputs, words per sentence and word length. Syllable counting differs slightly between every implementation in existence, so treat small differences between tools as noise.

Different sentence-splitting and syllable heuristics. Nobody's implementation is canonical; use one consistently rather than comparing across them.

For general audiences, somewhere around 8 to 10. For academic work, higher is expected and appropriate.

The writing analysis and your Style DNA run in your browser. For a real AI score, the text you check is sent to an AI-detection provider, and we never store it. When you rewrite on a paid plan, the draft is sent to our server, rewritten and sent back without being stored. AI features (rewriting, humanizing and Copilot) send the text to Cloudflare Workers AI, which processes it and doesn't keep it.

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