Readability Score
Calculate readability with 6 formulas, highlight difficult sentences, and get improvement suggestions.
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About this tool
- 1
Paste your content
Enter the text you want to analyze - articles, marketing copy, documentation, or any written content.
- 2
Review readability scores
See results from multiple formulas including Flesch-Kincaid Grade Level, Gunning Fog Index, and SMOG Index.
- 3
Understand the grade levels
Each score maps to a U.S. school grade level indicating the education needed to easily understand the text.
- 4
Simplify where needed
Use the sentence-level breakdown to identify complex sentences and difficult vocabulary to revise.
- Aim for a Flesch-Kincaid grade level of 7-8 for general web content - this is comfortable reading for most adults.
- Break long sentences (over 25 words) into shorter ones to instantly lower your readability grade level.
- Replace multi-syllable jargon with simpler synonyms when writing for a broad audience.
- Technical documentation naturally scores higher - adjust your target grade level based on your audience.
- Flesch-Kincaid Grade Level and Reading Ease scores
- Gunning Fog Index for gauging text complexity
- SMOG Index optimized for health and educational content
- Sentence-by-sentence difficulty highlighting
- Word count, sentence count, and average syllable statistics
- Ensure marketing copy is accessible to a general audience before launch
- Check patient-facing healthcare documents for plain language compliance
- Evaluate student essays or educational materials for grade-appropriate language
- Optimize help documentation to reduce support ticket volume
Flesch-Kincaid is the most widely used for general content. Gunning Fog is better for business writing, and SMOG is preferred for healthcare and government documents.
Not necessarily. Match the level to your audience. Legal documents, academic papers, and technical specs may require higher grade levels to maintain precision.
Reading Ease scores 0-100 (higher is easier). Grade Level maps to U.S. school grades (lower is easier). They use the same inputs but different formulas.