Free Readability Score Calculator

Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog and Coleman-Liau — the standard English readability metrics.

Word Counter

Runs entirely in your browser — paste text and watch the results update instantly. Nothing is uploaded.

100% Client-Side — Your text stays in your browser. Nothing is uploaded.

How to use this tool

  1. 1

    Paste your text

    A paragraph, article or document you want to gauge.

  2. 2

    Read the four scores

    Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog and Coleman-Liau.

  3. 3

    Interpret the results

    A Flesch band label (e.g. 'Fairly easy') puts the number in context.

Key features

MetricWhat it measures
Flesch Reading Ease0–100, higher = easier
Flesch-Kincaid GradeUS school grade level
Gunning FogYears of education needed
Coleman-LiauGrade level from letters/sentences

Privacy: your text never leaves your browser

Every Toolflect Text Tool is 100% client-side. The moment you type or paste text, it is analyzed by JavaScript running inside this browser tab. Your text is never sent to our servers, never stored in a database, and never shared with any third party or AI service.

  • No uploads, no accounts, no sign-up
  • No cookies or tracking of your text
  • Works offline once the page has loaded
  • Close the tab and your text is gone from memory

You can even verify it yourself: open your browser's developer tools, switch to the Network tab, and type into the tool — the only requests you will ever see are this page's own static files (HTML, CSS, JavaScript). Nothing you type is ever transmitted.

Frequently asked questions

Which formulas are used?
The standard English heuristics: Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog and Coleman-Liau — each shown in the report with its exact formula.
How are syllables counted?
By an English vowel-group heuristic (vowel runs minus silent final e, minimum one per word). It is approximate — fine for aggregate scores, not a dictionary.
Do the scores work for Arabic?
The formulas are English heuristics; non-Latin text gets a best-effort syllable estimate, so interpret scores as indicative only.
Private?
Fully — all scoring runs locally in your browser.

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