Readability Score
Calculate Flesch-Kincaid, Gunning Fog and Coleman-Liau readability scores.
How to Use the Readability Score Calculator
Paste your text to get readability scores from four established formulas: Flesch-Kincaid Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, and Coleman-Liau Index. Each score includes an explanation and grade level indication.
Understanding the Scores
- Flesch Reading Ease — Scale 0-100. Higher = easier. Aim for 60-70 for general audiences.
- Flesch-Kincaid Grade — US school grade level. Lower = easier. Web content should target grades 7-8.
- Gunning Fog — Years of education needed. Under 12 is accessible to most readers.
- Coleman-Liau — Based on character and sentence counts. Similar interpretation as FK Grade.
Frequently Asked Questions
What readability score should I aim for?
For web content, aim for a Flesch Reading Ease of 60-70 and a grade level of 7-8. Newspapers target grade 8, scientific papers grade 14+. Match your audience.
How are syllables counted?
Syllables are estimated using English vowel patterns. While not 100% precise for every word, the estimates are accurate enough for reliable readability scoring.
How many words do I need for accurate results?
At least 100 words for reliable results. The formulas work best with several paragraphs of natural prose. Very short texts may produce skewed scores.
Should I only write simple sentences?
No. Vary your sentence length and structure. The goal is clarity, not oversimplification. Mix short punchy sentences with longer explanatory ones.
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