Free Flesch Readability Score Calculator
A Flesch readability score measures how easy your writing is to understand by analyzing sentence length and syllable complexity. Use this free Flesch reading ease calculator to check readability scores, identify hard-to-read sections, and make your content accessible to any audience.
Paste any text, review the Flesch Reading Ease and Flesch-Kincaid Grade Level alongside Gunning Fog and SMOG indexes, then use the targeted suggestions to improve clarity before publishing.
Paste Your Text
Calculate readability scores in the browser
Nothing is uploaded. Every calculation stays client-side.
Suggestions to improve clarity
The tool checks for common patterns that make text harder to read and understand.
Write for your audience
Consider who will read your text. A general audience benefits from shorter sentences and familiar words.
Prefer concrete language
Specific verbs and plain nouns read faster than abstract language and technical jargon.
Break up long paragraphs
Most readers scan content in short bursts. Frequent paragraph breaks make longer text easier to keep reading.
FAQ
Common questions about Flesch readability scores
What is the Flesch Reading Ease score and what do the ranges mean?
Flesch Reading Ease rates text on a scale from 0 to 100. Higher scores mean easier reading. A score of 90 to 100 is considered very easy (5th grade level), 60 to 69 is standard (8th to 9th grade), 30 to 49 is difficult (college level), and 0 to 29 is very confusing (college graduate level). Most web content should aim for 60 or above.
What is a good Flesch-Kincaid Grade Level?
A good Flesch-Kincaid Grade Level depends on your audience. For general web content and blog posts, aim for grade 7 to 9. Marketing copy and consumer-facing emails perform best at grade 6 to 8. Academic and technical writing may land at grade 12 or above, which is acceptable for specialized audiences but too high for general readers.
How is the Flesch readability score calculated?
The Flesch Reading Ease formula is 206.835 minus 1.015 times the average sentence length minus 84.6 times the average syllables per word. Shorter sentences and simpler words produce higher (easier) scores. The Flesch-Kincaid Grade Level uses a related formula that outputs a U.S. school grade instead of a 0 to 100 scale.
What is the difference between Flesch Reading Ease and Flesch-Kincaid Grade Level?
Both formulas use average sentence length and average syllables per word, but they interpret the result differently. Flesch Reading Ease returns a 0 to 100 score where higher means easier. Flesch-Kincaid Grade Level returns a U.S. school grade where lower means easier. A Flesch Reading Ease of 70 roughly corresponds to a 7th grade Flesch-Kincaid level.
Is this readability calculator free?
Yes. This tool runs entirely in your browser, never uploads your text, and gives you instant Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog, and SMOG scores at no cost. There are no sign-up requirements or usage limits.
Can I use this tool for academic or professional writing?
Absolutely. While academic writing naturally scores higher on grade-level formulas, this calculator helps you identify unnecessarily complex sentences and jargon-heavy passages. Even technical documents benefit from clearer phrasing where possible, and the suggestions can guide you toward more accessible academic prose.
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