Readability score (Flesch Reading Ease)
Measure how easy your text is to read with the Flesch Reading Ease score, with average sentence length, syllables per word and the longest sentences to review.
How to useIs your text easy to read?
Longest sentences
Available in: 
Readability score (Flesch Reading Ease): what it is for
Paste your text and the tool counts words, sentences and syllables to calculate the Flesch Reading Ease score. It shows the rating from very easy to very difficult, the average words per sentence and syllables per word, and lists the longest sentences for you to review.
How to use
- Paste the text.
- See the score and rating.
- Review the longest sentences.
When to use it
- Reviewing website and blog copy.
- Simplifying announcements and manuals.
- Adapting text to plain language.
Frequently asked questions
How is the score calculated?
With Rudolf Flesch's Reading Ease formula (1948): 206.835 − 1.015 × words per sentence − 84.6 × syllables per word. The higher the score, the easier the text. Syllables are counted with a heuristic for English, so the result is a close estimate.
What score should I aim for?
80 to 100 is very easy, 60 to 80 is easy (plain English), 30 to 60 is difficult and below 30 is very difficult. Text for the general public, like websites and manuals, works best above 60.
How do I improve the score?
Split long sentences, prefer short, common words and use the active voice. The tool highlights the longest sentences so you can start with them.
Does readability affect SEO?
Not directly: Google doesn't use readability formulas as a ranking factor. But clear text keeps readers engaged, which helps indirectly.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.