Readability Checker
Score your text's reading ease and grade level instantly.
Paste your text to get a readability score in real time: the Flesch Reading Ease (0–100, higher is easier) and the Flesch–Kincaid grade level, along with your average words per sentence and syllables per word.
All analysis runs in your browser — your text never leaves your device.
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Private by design. Your text is processed entirely in your browser — it is never uploaded, logged, or stored on a server.
How the score is calculated
Readability is driven by two things: how long your sentences are and how many syllables your words have. The Flesch Reading Ease formula combines average words per sentence and average syllables per word into a 0–100 score — 60–70 is plain, conversational English; below 30 is dense and academic. The grade level estimates the US school grade needed to read the text comfortably.
Syllables are estimated with a standard English heuristic, which is accurate enough for a useful signal but not a dictionary-perfect count. Use the score to compare drafts and spot passages that need simplifying.
Improving readability
Shorten long sentences — aim for an average around 15–20 words. Prefer shorter, common words over long ones. Break dense paragraphs into smaller chunks. Most web and marketing copy reads best at a grade level of about 7–9; technical documentation can be higher when the audience expects it.
Examples
| Example | Input | Result |
|---|---|---|
| Plain English | Short, clear sentences. | ~80 (Easy) |
| Standard prose | Typical article paragraph | ~60 (Standard) |
| Dense academic | Long, clause-heavy sentences | ~30 (Difficult) |
Frequently asked questions
What is a good Flesch Reading Ease score?
60–70 is plain English suitable for a general audience. Higher is easier; below 30 is difficult and academic.
What does grade level mean?
It's the approximate US school grade needed to read the text comfortably. Grade 7–9 suits most general web content.
Are the syllable counts exact?
They use a reliable heuristic. It's accurate enough to guide editing, though it isn't a dictionary-perfect syllable count.
Is my text private?
Yes. The analysis runs entirely in your browser and your text is never uploaded.