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Readability Scorer

Check your content's readability with Flesch-Kincaid, Gunning Fog, Coleman-Liau, and Automated Readability Index scores.

Free. No signup required.

How It Works

Paste your text and see readability scores instantly. Aim for Grade 7-9 for most web content.

1

Paste your content

Works with any text. Articles, landing pages, email copy.

2

See four readability scores

Flesch-Kincaid, Gunning Fog, Coleman-Liau, and ARI calculated instantly.

3

Check your grade level

Get an averaged grade level estimate and difficulty rating.

Grade Level
N/A
Difficulty
N/A
0
Flesch-Kincaid
0
Gunning Fog
0
Coleman-Liau
0
ARI
What do these scores mean?
Flesch-KincaidMeasures sentence length and syllable count to estimate grade level. Use it to verify your blog posts target the 7th-9th grade sweet spot for web content.
Gunning FogCounts complex words (3+ syllables) relative to sentence length. High Fog scores mean you're using jargon that will lose casual readers.
Coleman-LiauUses character count instead of syllables for more consistent results across languages. Useful for checking translated or multilingual content.
ARIEmphasizes characters per word and words per sentence. The most lenient of the four. If ARI says it's hard, it's definitely hard.
Total Words0
Total Sentences0
Total Syllables0
Complex Words (3+ syllables)0
Avg. Sentence Length0

Why Readability Matters for Content Marketing

The Average US Reading Level Is 8th Grade

That single stat shapes everything about how you should write for the web.

  • The most successful content reads at a 7th to 9th grade level
  • Plain language keeps readers on page longer and reduces bounce rates
  • Four readability scores let you cross-reference for accuracy
  • AI-generated text often skews more complex than what performs well

Four Readability Formulas, One Clear Answer

Each formula measures different aspects of text complexity.

  • Flesch-Kincaid focuses on syllable count and sentence length
  • Gunning Fog penalizes complex words with 3+ syllables
  • Coleman-Liau uses character count for more consistent cross-language results
  • ARI emphasizes characters per word and sentence length
  • Averaging all four gives a more reliable grade level than any single score

How Readability Affects SEO and Conversions

Google tracks bounce rate, time on page, and engagement — all influenced by readability.

  • Grade level above 10? Split long sentences and simplify complex words
  • Content marketers who check readability before publishing see better engagement
  • Pair with our word counter to check sentence length stats
  • Explore AI writing tools with built-in readability optimization

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