Readability Calculator
Scores your text through 8 popular readability formulas and provides an average grade level
About this readability calculator
Free Readability Calculator Online
Analyze text readability with 8 popular formulas including Flesch-Kincaid, Gunning Fog, SMOG, Dale-Chall, and more. Get grade level scores and improve your writing.
Features & Benefits
- 8 readability formulas in one tool
- Instant grade level calculation
- Flesch Reading Ease and Flesch-Kincaid Grade Level
- FORCAST formula for technical and form-based texts
- Dale-Chall and Spache for educational materials
- Lexical density and diversity analysis
- No sign-up required - completely free
Common Uses
- Improve content accessibility for target audiences
- Match writing complexity to reader education level
- Ensure compliance with readability standards (ADA, Plain Language)
- Analyze academic papers and technical documents
- Optimize marketing copy and web content
- Evaluate children's reading materials
FAQ
What is the best readability formula to use?
There's no single best formula - each has strengths. The Consensus Calculator averages 8 formulas for a balanced score. Use Flesch-Kincaid for general content, FORCAST for technical/procedural documents, Dale-Chall for educational materials, and Spache for primary grade texts (grades 1-3).
What grade level should I target for my writing?
For general public audiences, aim for 6th-8th grade level (Flesch Reading Ease 60-70). Web content typically targets 7th-9th grade. Health information should be 6th grade or below. Academic writing is usually 12th grade and above. Always consider your specific audience's education level.
How accurate are readability formulas?
Readability formulas provide estimates based on surface-level features like word and sentence length. They don't account for reader familiarity with the topic, motivation, or context. Use them as guidelines to improve clarity, not as absolute measures of comprehension.
What is lexical density and why does it matter?
Lexical density measures the ratio of content words (nouns, verbs, adjectives, adverbs) to total words. Higher density (>60%) indicates information-rich, academic text that may be harder to process. Lower density (<40%) suggests conversational writing. It helps you balance information load with readability.
What is the difference between Fry and Raygor?
Both use graphs to determine grade level, but Fry counts syllables while Raygor counts long words (6+ letters). Raygor is faster to calculate manually and works well for quick assessments. Fry is more widely used and validated. Both produce similar results for most texts.
Why does FORCAST only count single-syllable words?
FORCAST was designed for technical documents, forms, and military manuals where sentence structure varies greatly. By focusing only on single-syllable words in a 150-word sample, it provides reliable results regardless of sentence complexity. It's particularly accurate for procedural and form-based content.