📊 Readability Score Calculator

Calculate Flesch-Kincaid Grade Level, Gunning Fog, SMOG, and Coleman-Liau readability scores with interpretation.

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Words

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Syllables

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Flesch-Kincaid Grade Level

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Gunning Fog Index

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SMOG Index

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Coleman-Liau Index

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Readability Score Calculator

Analyze your text with four standard readability formulas. Each score estimates the education level needed to understand the text.

Flesch-Kincaid: 0.39×(words/sentences) + 11.8×(syllables/words) - 15.59
Gunning Fog: 0.4×((words/sentences) + 100×(complex_words/words))
SMOG: 1.043×√(30×polysyllables/sentences) + 3.1291
Coleman-Liau: 0.0588×L - 0.296×S - 15.8 (L=avg letters/100 words, S=avg sentences/100 words)

What is Flesch-Kincaid Grade Level?

It estimates the US school grade level needed to understand the text. A score of 8 means roughly an 8th grader can read it.

What is a good readability score?

For general audience writing, aim for grade level 7-9. Academic writing typically scores 10-14. Simple communication should be 5-7.