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Measure readability using Flesch Reading Ease and grade level estimates with sentence complexity hints.
Generate placeholder text, random strings, and compare plain text quickly.
Evaluate reading complexity with Flesch score, grade level, and sentence metrics.
Flesch Score
45.8
FK Grade
9.2
Fog Index
10.1
Audience
High School
Words
19
Sentences
2
Syllables
34
Complex Words
15.8%
Quick Guidance
Dense content detected. Reduce sentence length and replace complex words where possible.
Complex writing loses readers faster than complex ideas. The Readability Grade Checker scores your text using industry-standard formulas and surfaces sentence-level patterns that reduce accessibility — so you can simplify structure without sacrificing accuracy.
Shorten sentences first, then replace multi-syllable words with simpler equivalents where precision allows. Vary sentence length intentionally — a mix of short punchy sentences and longer flowing ones reads better than uniform simplicity throughout.
Pair with Word Counter to compare readability improvements against overall content length.
It calculates Flesch-Kincaid Grade Level, Gunning Fog Index, Coleman-Liau Index, and Automated Readability Index so you can cross-reference multiple scales.
Most usability guidelines recommend grade 6–8 for general audiences. Technical documentation can target higher, but simpler prose improves engagement and accessibility.
The formulas are designed for English syllable and sentence structures. Results for other languages may be directionally useful but not calibrated.
Check out our technical guides to learn more about how browser-side processing works.
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