Content Readability Score Calculator
A Score That Predates the Internet But Still Applies
The Flesch Reading Ease formula was developed in 1948 to gauge how difficult a passage of English text is to read, using nothing more than sentence length and syllable count. Decades later it's still one of the most widely used readability metrics for web content, because shorter sentences and simpler words reliably correlate with how easily a general audience can process a page — which matters for both user experience and how long visitors stay on a page.
The Formula
Syllables are estimated with a vowel-cluster heuristic (counting groups of consecutive vowel sounds, with an adjustment for silent trailing "e"), so the count may differ slightly from a dictionary-exact syllable count on unusual words.
Where This Matters
- Editing for a general audience — catching passages that have drifted into dense, jargon-heavy sentence structures before publishing.
- Matching content to its audience — a landing page aimed at consumers benefits from a much easier score than a technical whitepaper aimed at engineers.
- Comparing drafts — running two versions of the same paragraph through the formula to see which one actually reads more easily, rather than guessing.
Reading Ease Score Bands
| Score | Difficulty | Approximate Level |
|---|---|---|
| 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 |
| Below 30 | Very Difficult | College graduate |
How to Use This Calculator
- Paste the content you want to analyze into the text field.
- Select Calculate to get the Flesch Reading Ease score along with word, sentence, and estimated syllable counts.
- Compare the resulting difficulty level against your target audience and revise if the text reads more difficult than intended.
Related Calculations
Check the same draft's keyword usage with the Keyword Density Calculator, or verify your meta description length with the Meta Description Length Calculator.