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Readability Checker

Score your text against every major readability formula at once.

Text Tools Reviews Free · no sign-up

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consensus grade level across six formulas

Formula Score What it counts

Your longest sentences

  • Paste some text.

Most frequent long words

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Quick Tool Overview

The Readability Checker runs six established formulas at once — Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau and ARI — and reports a consensus grade alongside them. Where they disagree, the reason is named, and the sentences dragging the score down are listed.

What it does
Scores text against six readability formulas
You give it
An article, page, report or email
You get back
A consensus grade, six scores and the problem sentences
Best for
Editing for a specific audience reading level
Text Tools Free, unlimited use No sign-up Runs in your browser

About the Readability Checker

Readability formulas disagree, and that disagreement is informative. They measure different things: some count syllables, some count letters, some count words per sentence. A text that scores well on one and badly on another usually has a specific, fixable problem.

This runs six established formulas together — Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog, SMOG, Coleman-Liau and the Automated Readability Index — and reports a consensus grade alongside the individual scores. Underneath, it names the sentences that are dragging the score down and the words that are doing it, because a number on its own tells you there is a problem without telling you where.

Key features of the Readability Checker

Six formulas, one consensus

An average across established measures is far more stable than any single score.

Disagreements explained

Where syllable-based and character-based formulas diverge, the reason is named rather than left as noise.

Hardest sentences listed

The specific sentences costing you the most, ranked — because a number alone does not tell you where to edit.

Audience benchmarks

Your score against newspapers, health guidance and academic writing, so the grade means something.

Sample size warning

Below a hundred words the tool says the result is unreliable rather than presenting it as fact.

How to use the Readability Checker

  1. 1

    Paste your text

    An article, a page, a report or an email — at least a hundred words for a reliable score.

  2. 2

    Read the consensus grade

    The average of six formulas, which is more stable than any single one.

  3. 3

    Compare the individual scores

    Where they disagree, the reason is named — long sentences, long words or both.

  4. 4

    Fix what is flagged

    The hardest sentences and the longest words are listed, so you know where to edit.

Frequently asked questions

Grade 8 to 10 for general web content, which is roughly what a popular newspaper uses. Grade 6 to 8 for health and government information. Anything above grade 12 excludes a large part of the adult population.

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