Readability Checker
Paste your text to get its Flesch Reading Ease score, reading level, and five grade-level indices instantly.
Start typing or paste some text above to see your readability scores.
Grade-level indices
About the Readability Checker
Readability formulas estimate how hard a piece of writing is to read, based on how long your sentences are and how many syllables your words carry. This tool computes the six most widely used English measures at once: the Flesch Reading Ease score (higher means easier) plus five grade-level indices — Flesch–Kincaid Grade, Gunning Fog, SMOG, Coleman–Liau, and the Automated Readability Index (ARI) — each estimating the U.S. school grade a reader would need.
- Most web and business writing reads best at grade 7–9 (Flesch Reading Ease 60–70).
- Long sentences hurt readability the most — split them to see scores improve fast.
- The indices use different formulas, so a spread of a grade or two between them is normal.
- Syllables are estimated, so use the numbers as a guide, not a verdict.
How it works
Three steps. No sign-up, no upload, no wait.
Paste your writing
Drop an article, email, or paragraph into the box — the more text, the more reliable the scores.
Read your scores
See the Flesch Reading Ease score and reading level, plus five grade-level indices, updated as you type.
Edit and re-check
Shorten long sentences and swap in simpler words, then watch the readability climb.
Private by design.Everything happens right here in your browser. Your files are never uploaded — we never see them.