UD5 Toolkit
Text Readability Scorer - Online Flesch-Kincaid & ARI Calculator
Compute multiple readability scores (Flesch Reading Ease, Grade Level, ARI, SMOG). Paste any English text and see which grade level it's suitable for. Local.
Readability Analyzer - Online Flesch-Kincaid & SMOG Index
📖 Readability Analyzer
Flesch-Kincaid Reading Ease, Grade Level & SMOG Index
Paste your English text below to instantly analyze its readability score. No data is sent to any server.
0 words
Flesch Reading Ease
—
(0-100, higher = easier)
Grade Level
—
Flesch-Kincaid Grade
SMOG Index
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Years of education
Text Statistics
0 snt
0 wrd
0 syl
0 poly
avg. syl/word: 0avg. words/sentence: 0
Frequently Asked Questions
The Flesch Reading Ease score rates text on a 100-point scale. The higher the score, the easier it is to understand. Scores between 60-70 are considered standard (8th-9th grade). Formula: 206.835 - 1.015 × (words/sentences) - 84.6 × (syllables/words).
It translates the Reading Ease score into a U.S. school grade level. For example, a score of 8.2 means the text can be understood by an average 8th grader. Formula: 0.39 × (words/sentences) + 11.8 × (syllables/words) - 15.59.
SMOG (Simple Measure of Gobbledygook) estimates the years of education needed to understand a text. It uses the number of polysyllabic words (≥3 syllables) and sentence count. Formula: 1.0430 × sqrt(polysyllables × (30/sentences)) + 3.1291.
Readability scores help writers tailor content for their target audience. They're widely used in education, healthcare, legal documents, and web content to ensure clarity and accessibility.
The algorithms are designed for English. They rely on syllable counting rules specific to English. Using other languages will give inaccurate results.
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