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Readability Checker

Test your readability score with Flesch, Flesch-Kincaid, Gunning Fog, Coleman-Liau and SMOG. Free and instant.

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This free readability checker analyzes your text using five established readability score formulas. All calculations run in your browser — your content stays completely private.

Frequently Asked Questions

What is the Flesch Reading Ease score?
The Flesch Reading Ease score rates text on a scale from 0 to 100. Higher scores (70–100) indicate easy-to-read text aimed at general audiences. Scores below 30 are very difficult and typically academic. Most web content should target a score of 60–70.
What readability score should I aim for?
For general web content and blogs, aim for a Flesch Reading Ease score of 60–70 (plain English, readable by most adults). For marketing copy, 70+ is ideal. Academic papers typically score 30–50. A Flesch-Kincaid Grade Level of 7–9 is recommended for most online content.
What is the Flesch-Kincaid Grade Level?
The Flesch-Kincaid Grade Level maps your text to a US school grade level. A grade of 8 means an 8th grader (roughly 13–14 years old) can read it. Most popular newspapers target grade 6–8. This readability checker shows the grade level instantly.
How do I improve my text readability?
The most effective ways to improve readability are: (1) shorten your sentences — aim for under 20 words each, (2) use simpler words with fewer syllables, (3) break up long paragraphs, and (4) use active voice instead of passive constructions.
What is the Gunning Fog Index?
The Gunning Fog Index estimates the years of education needed to understand a text. It is calculated using sentence length and the percentage of complex words (3+ syllables). A score of 12 corresponds to high school level. Most business writing targets a Fog Index of 10–12.