Readability Calculator — Browser Text Analysis

Text

Readability Calculator is a browser text tool that calculates flesch reading ease and flesch-kincaid grade.

Readability Calculator

Runs in this browserInput and recent results are processed only in this browser tab. They are not sent to or stored on a server.

Flesch scores use English word, sentence, and syllable counts. Treat non-English input as supporting statistics only.

English text

ResultRule shown

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What is it

Readability Calculator helps with search content checks, editorial review, and accessibility-adjacent text preparation. Input is capped at 20,000 characters to keep the browser responsive.

Flesch = 206.835 - 1.015(words/sentences) - 84.6(syllables/words)

How to use

1Paste or type text.
2Choose an option when available.
3Review the analysis or transformed output.

Reference

Readability Calculator — Browser Text Analysis Reference
Input	Result
The quick brown fox jumps.	Flesch Reading Ease + supporting stats

Sources & standards

MDN Web Docs: Client-side web APIs - MDN Web Docs

FAQ

Is Readability Calculator input sent to a server?

No. The input is processed locally in your browser and is not sent to a server.

Do Korean and English texts use identical rules?

No. Word and sentence counts are shared helpers, but English-only formulas should be interpreted only for English prose.

Does Flesch-Kincaid apply to Korean text?

No. The formula is designed for English syllables and sentence structure. For Korean, treat the extra counts as supporting statistics only.