Readability Analyzer — Flesch Scores & Grade Level
Paste any English text and get instant readability metrics: Flesch Reading Ease, Flesch-Kincaid Grade Level, sentence count, word count, syllable count, and average words per sentence. Everything runs in your browser — no server, no storage.
What the Scores Mean
Flesch Reading Ease (0–100)
| Score | Level | Audience |
|---|---|---|
| 90–100 | Very Easy | 5th grade |
| 80–89 | Easy | 6th grade |
| 70–79 | Fairly Easy | 7th grade |
| 60–69 | Standard | 8th–9th grade |
| 50–59 | Fairly Difficult | 10th–12th grade |
| 30–49 | Difficult | College level |
| 0–29 | Very Confusing | Professional / academic |
Higher scores mean easier, more accessible text. Most web content targets 60–70.
Flesch-Kincaid Grade Level
The Flesch-Kincaid Grade Level formula converts the same sentence-length and syllable data into a US school grade number. A score of 8 means an 8th-grader can read it comfortably. Aim for grade 6–9 for general audience web copy. Technical documentation and legal text often exceed grade 16.
How the Formulas Work
Flesch Reading Ease:
206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words)
Flesch-Kincaid Grade:
0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59
Both formulas penalize long sentences and polysyllabic words. Short sentences and common single-syllable words produce high ease scores.
Practical Tips to Improve Readability
- Break long sentences — aim for an average of 15–20 words per sentence
- Use common words — prefer “use” over “utilize”, “start” over “commence”
- Avoid nominalizations — “to decide” reads better than “to make a decision”
- Active voice — “We fixed the bug” scores better than “The bug was fixed by us”
- Short paragraphs — readers scan; short blocks lower perceived complexity
Who Uses Readability Scores?
Content writers use readability scores to match audience expectations. SEO professionals use them because readable content correlates with lower bounce rates. Educators assess whether study materials are grade-appropriate. Legal teams review contracts for plain-language compliance. Technical writers ensure documentation stays accessible to non-experts.
Privacy
All text analysis happens entirely in your browser. Nothing is uploaded to any server.