Free Readability Score Calculator

🟢 Runs Locally — verified: your files are processed in this browser. No uploads.

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. Visit counting (see the note at the foot of this page) is separate from your text and never receives it.

  • No uploads, no accounts, no sign-up
  • Your text is processed locally in your browser and never stored.
  • 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 — no request ever carries your text. You will also see the Google Analytics request that counts the visit; it carries a page view and never anything you typed, and no cookie or identifier is stored until you accept analytics.

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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