Readability & Grade Level Calculator
Calculate Flesch Reading Ease, Flesch-Kincaid Grade, Gunning Fog, and reading time metrics.
100% Client-Side · In-Memory Only
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How to Use Readability & Grade Level Calculator
- Paste your article, documentation, or marketing copy into the text editor.
- Inspect the 4 primary readability indexes: Flesch Reading Ease, Flesch-Kincaid Grade Level, Gunning Fog, and Coleman-Liau.
- Review detailed text statistics including word count, sentence count, and syllable counts.
- Check estimated silent reading time and spoken presentation duration.
Features & Guarantees
- Calculates standard academic and industry readability metrics.
- Flesch Reading Ease scoring from 0 (very difficult) to 100 (very easy).
- Flesch-Kincaid Grade Level indicating required years of education.
- Gunning Fog and Coleman-Liau indexes for cross-verification.
- Estimates both silent reading speed (200 wpm) and spoken presentation speed (130 wpm).
Frequently Asked Questions
What is a good Flesch Reading Ease score?
A score between 60 and 70 is considered standard plain English (8th-9th grade level), suitable for general public documentation and consumer websites.
How is the Gunning Fog index calculated?
The Gunning Fog index estimates the years of formal education needed to understand text on a first reading, factoring in average sentence length and the percentage of complex words (3+ syllables).