Readability Score Calculator
Analyze text readability using Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, SMOG Index, and more. Helps writers optimize their content for the right audience.
Parameters
Supports English text analysis.
Results
Very Confusing — college graduate level
Other results (8)
U.S. school grade needed to understand this text
Years of formal education needed
U.S. grade level based on characters per word
Years of education needed (best for health materials)
U.S. grade level based on characters and words
Why Choose Readability Score Calculator
The Readability Score Calculator evaluates text complexity using six established formulas: Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog Index, Coleman-Liau Index, SMOG Index, and Automated Readability Index. It counts syllables using a vowel-group algorithm with silent-e and suffix handling to produce accurate grade-level estimates.
- ✓Six readability formulas for comprehensive text analysis
- ✓Accurate syllable counting with silent-e and suffix handling
- ✓Grade-level interpretation for each score
- ✓Total sentence, word, and syllable counts
How to Use
- 1Paste at least 100 words of natural prose into the text area.
- 2Review the Flesch Reading Ease score for overall readability.
- 3Check the Flesch-Kincaid Grade Level for U.S. school grade equivalence.
- 4Compare multiple indexes to get a well-rounded readability picture.
- 5Use the word and syllable counts to adjust text complexity as needed.
Frequently Asked Questions (FAQ)
What is a good Flesch Reading Ease score?
A score of 60–70 is considered standard plain English suitable for most adult audiences. Scores above 80 are very easy to read, while below 30 indicates college-graduate complexity.
How are syllables counted?
The tool counts vowel groups (a, e, i, o, u, y) and applies adjustments for silent e, -ed endings, and -le endings to approximate syllable count without a dictionary.
Why are there multiple readability formulas?
Different formulas weight different factors. Flesch-Kincaid emphasizes syllables per word, Gunning Fog focuses on complex words, and Coleman-Liau uses character counts. Using multiple formulas gives a more robust estimate.
What is the SMOG Index?
SMOG (Simple Measure of Gobbledygook) is designed for evaluating health education materials. It estimates years of education needed to understand a text based on polysyllabic word frequency.
How much text do I need for accurate results?
At least 100 words is recommended. Shorter texts may produce unreliable scores since readability formulas are calibrated for longer passages.
Authoritative References & Sources
Wikipedia — Flesch-Kincaid readability tests
View SourceWikipedia — Gunning fog index
View SourceWikipedia — SMOG
View SourceRelated Tools
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