Readability Score
Calculate readability scores for your text
Readability Score is a free online tool from BrowserUtils that calculate readability scores for your text. It runs entirely in your browser — your data never leaves your device. No account required.
How to use Readability Score
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About Readability Score
Free online readability score calculator. Analyze text with Flesch-Kincaid, Gunning Fog, and Coleman-Liau formulas to determine grade level and reading ease. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
Readability Score specs
- Runtime
- 100% client-side (browser)
- Built on
- WCAG 2.2 contrast formulas (relative luminance per W3C spec) and ARIA 1.2 role mappings
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
What readability score should I aim for?
For general web content, aim for a Flesch Reading Ease score of 60-70 (8th-9th grade level). Government and healthcare content should target 6th-8th grade. Technical documentation can be higher, but simpler language improves accessibility for all users.
How are readability scores calculated?
Readability formulas use statistical measures like average sentence length, word length, and syllable count. Flesch-Kincaid uses syllables per word and words per sentence. Gunning Fog adds complex word percentage. Coleman-Liau uses character counts instead of syllables.
What is the difference between Flesch Reading Ease and Flesch-Kincaid Grade Level?
Flesch Reading Ease gives a score from 0 to 100 where higher is easier to read. Flesch-Kincaid Grade Level converts the same inputs into a U.S. school grade level, so a score of 8.0 means an eighth grader can understand it.
Does the readability score tool support languages other than English?
The formulas were designed for English text and rely on English syllable counting rules. Results may be inaccurate for other languages. Use language-specific readability tools for non-English content.
Is my text stored when I use the readability score tool?
No. All analysis runs locally in your browser. The text you enter is not sent to any server or saved anywhere.
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