Readability Score Calculator
Readability Score Calculator: free, instant and private. Scores run 0–100: 60–70 is plain English, most news writing sits at 55–65, and legal text falls below 30.
How the Readability Score Calculator works
The Readability Score Calculator takes Your text and returns the answer instantly — no button to hunt for, no page reload. Scores run 0–100: 60–70 is plain English, most news writing sits at 55–65, and legal text falls below 30. Aim for 55–70 for blog posts; 30–50 is fine for technical documentation.
Enter your own numbers to replace the example values; the result panel updates as you type. Everything runs in this single page, so nothing you enter leaves your device.
Formula used
Flesch reading ease = 206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words)
| Symbol | Meaning |
|---|---|
| words ÷ sentences | average sentence length — the strongest lever you control |
| syllables ÷ words | average word length in syllables, estimated from vowel groups |
Scores run 0–100: 60–70 is plain English, most news writing sits at 55–65, and legal text falls below 30. Aim for 55–70 for blog posts; 30–50 is fine for technical documentation.
Inputs used: Your text.
Worked example
Take the default example — your text of The sun rises and the birds begin to sing. We pack some food, fill our bottles and walk to the lake. It is a short trip, but it always feels like a small holiday.:
- score: 88.3
- grade: 4
- words: 34
- sentences: 3
- avgWordsPerSentence: 11.3
Frequently asked questions
- What formula does the Readability Score Calculator use?
- It uses Flesch reading ease = 206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words), where words ÷ sentences is the average sentence length — the strongest lever you control; syllables ÷ words is the average word length in syllables, estimated from vowel groups.
- Is the Readability Score Calculator free?
- Yes. There is no signup, no usage limit and no watermark — the checker runs entirely in your browser.
- How do I read the result?
- Scores run 0–100: 60–70 is plain English, most news writing sits at 55–65, and legal text falls below 30. Aim for 55–70 for blog posts; 30–50 is fine for technical documentation.
- Does the Readability Score Calculator store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.