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Readability Score Calculator

Calculate multiple readability indices including Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, Coleman-Liau, and Automated Readability Index.

Inputs

Results

Flesch Reading Ease

59.64

Flesch-Kincaid Grade Level9.91
Gunning Fog Index12
Coleman-Liau Index4.77
Automated Readability Index6.23
How to Use This Calculator
  1. Enter or paste the text sample (at least 100 words for reliable scoring).
  2. Select the readability formula: Flesch-Kincaid, Gunning Fog, SMOG, or Flesch Reading Ease.
  3. Review the grade level equivalent and reading ease score.
  4. Aim for Flesch-Kincaid grade 6-8 for general public documents and grade 10-12 for professional writing.
  5. Simplify long sentences and multi-syllable words if the score is higher than your target audience's level.

What each input means

Total Words
Total number of words in the text sample.
Total Sentences
Total number of sentences in the text sample.
Total Syllables
Total number of syllables across all words.
Complex Words (3+ syllables)
Words with three or more syllables (excluding common suffixes like -ed, -es, -ing).

What each result means

Flesch Reading Ease
0-30 = very difficult, 60-70 = standard, 90-100 = very easy.
Flesch-Kincaid Grade Level
US school grade level needed to understand the text.
Gunning Fog Index
Years of formal education needed. 12 = high school senior.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total Words = 300, Total Sentences = 15, Total Syllables = 450, Complex Words (3+ syllables) = 30 = 4 input(s) provided
  2. Calculate Flesch Reading Ease
    Flesch Reading Ease = max(-100
    59.64 = 59.64
  3. Calculate Flesch-Kincaid Grade Level
    Flesch-Kincaid Grade Level = max(0
    9.91 = 9.91
  4. Calculate Gunning Fog Index
    Gunning Fog Index = max(0
    12 = 12

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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