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Reading Level Analyzer
Paste any passage and get its Flesch Reading Ease and Flesch-Kincaid Grade Level, computed live as you type. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
- Words
- Sentences
- Avg. words/sentence
- Flesch-Kincaid grade
Reading ease
How it works
- Paste in any passage of text.
- Words, sentences, and syllables are counted, then run through the Flesch Reading Ease and Flesch-Kincaid Grade Level formulas.
- Both a grade-level score and a plain-English ease description are shown.
The formula
Flesch Reading Ease = 206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words). Flesch-Kincaid Grade Level = 0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59.
FAQ
What is the Flesch-Kincaid Grade Level?
A readability formula that estimates the US school grade level needed to understand a passage, based on average sentence length and syllables per word.
How is syllable count estimated?
This uses a vowel-group heuristic (counting clusters of vowels, adjusting for silent endings like a trailing "e") — it's a close approximation, not a dictionary lookup, so it can be off by one on unusual words.
What reading level should I aim for?
General audiences and marketing copy typically target grade 6-8; technical or academic writing often runs grade 12+. Lower grade levels are generally easier and faster to read.
Is my text sent anywhere?
No — word, sentence, and syllable counting all happen locally in your browser as you type.
Does this work for languages other than English?
The Flesch formulas were designed for English text, so running non-English passages through them will still produce a number, but it won't reflect true difficulty since syllable and word-length patterns differ by language.
How we compare
| Feature | Online Tool Store | Microsoft Word readability stats | Hemingway App |
|---|---|---|---|
| No document required | ✓ | ✗ | ✓ |
| Instant live scoring | ✓ | ✗ | ✓ |
| No sign-up | ✓ | ✓ | ✓ |
If you're checking a passage's grade level without opening Word, this gives you the same formula instantly, right in the browser.