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Readability Score Checker (Flesch-Kincaid & Gunning Fog)

Free client-side text readability checker computing Flesch Reading Ease, Flesch-Kincaid Grade Level, and Gunning Fog index scores in real time.

Presets:
42 words • 4 sentences • 285 characters
Flesch Reading Ease
49.1 / 100
Difficult (College Level)
Flesch-Kincaid Grade
Grade 9
Approx. Age 14
Gunning Fog Index
9.9
Years Formal Education
Coleman-Liau Index
Grade 14.6
Character Density Metric

Structural Text Statistics

Avg. Sentence Length10.5words / sentence
Avg. Word Length1.74syllables / word
Complex Words (3+ syl)6 (14.3%)polysyllabic count
Reading Duration1 minat 200 WPM

Optimize Your Academic Writing & Readability

Readability tests assess the syntactic and vocabulary complexity of written text. Whether preparing an academic thesis, technical documentation, or publishing a web article, checking your readability scores ensures your writing resonates with its intended audience.

Understanding Readability Test Metrics

  1. Flesch Reading Ease (0 – 100):

    • Higher scores indicate text that is easier to read; lower scores denote complex, academic material.
    • 90 – 100: Very Easy (5th grade reading level).
    • 60 – 70: Plain English (standard web and newspaper writing, 8th–9th grade).
    • 30 – 50: Difficult (Undergraduate college level).
    • 0 – 30: Very Difficult (Scientific journals, graduate dissertations, legal briefs).
  2. Flesch-Kincaid Grade Level:

    • Directly maps your text to the U.S. school grade education system.
    • A score of 8.0 means an eighth grader can understand the content without difficulty.
  3. Gunning Fog Index:

    • Estimates the years of formal education required to comprehend a piece of writing on first reading.
    • Weighs complex words (words containing three or more syllables, excluding common suffixes like -ed and -ing).
  4. Coleman-Liau Index:

    • Relies on character count rather than syllable estimation, providing a dependable benchmark against letter-dense technical jargon.

Tips to Improve Writing Clarity

  • Shorten Compound Sentences: Aim for an average sentence length between 15 and 20 words. Avoid combining multiple independent clauses with repetitive conjunctions.
  • Minimize Nominalizations: Replace bureaucratic noun phrases (e.g., “conduct an investigation into”) with direct active verbs (“investigate”).
  • Target Grade 8–10 for General Audiences: Government agencies and major news outlets target an 8th-grade readability score for maximum accessibility.