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Readability Score Checker

Measure English reading difficulty with six established formulas, then find the sentences and words most worth revising.

6 formulasSentence insightsPrivate in browser
0 words · 0 sentences
Use scores as signals

Readability is more than a single number

Different formulas emphasize syllables, characters, sentence length, or complex words. This checker shows each result and a median consensus rather than pretending one formula is definitive.

  1. Add enough textFor useful results, analyze at least 100 words and several complete sentences.
  2. Compare formulasExpect variation; look for the overall pattern.
  3. Revise and retestShorten difficult sentences and clarify unnecessary jargon.

Understanding the formulas

Flesch Reading Ease

Scores approximately 0–100. Higher values generally indicate easier English prose.

Flesch-Kincaid & ARI

Estimate US grade level using syllables or characters alongside sentence length.

Gunning Fog & SMOG

Emphasize complex or polysyllabic words. SMOG is most stable with 30 or more sentences.

Coleman-Liau

Uses letters and sentences per 100 words, avoiding syllable estimation.

Frequently asked questions

Can readability scores prove that writing is good?

No. They cannot judge factual accuracy, logic, organization, originality, tone, or whether technical terms are necessary.

Why do the six scores disagree?

Each formula measures different surface features and was developed using different assumptions. Small differences are normal.

Why is more text better?

A short sample can be dominated by one unusual sentence or word. Longer samples provide a more stable average.