Readability Score Checker
Calculate the Flesch Reading Ease score of your text.
About Readability Score Checker
The Readability Score Checker calculates the Flesch Reading Ease score of your content — the most widely used readability metric in the world. A higher score means easier to read. The tool also shows average sentence length and syllables per word, helping you fine-tune your writing for your target audience, whether that's a 5th grader or a medical professional.
What the Flesch Reading Ease Score Measures
This tool calculates the Flesch Reading Ease score, the most widely used readability formula in the world. It produces a number from 0 to 100 based on two measurable properties of your text: the average number of words per sentence and the average number of syllables per word. Shorter sentences and shorter words produce a higher (easier) score; longer sentences and longer words produce a lower (harder) score.
The exact formula, developed by readability researcher Rudolf Flesch in 1948, is:
Score = 206.835 − 1.015 × (words ÷ sentences) − 84.6 × (syllables ÷ words)The first variable, words ÷ sentences, is your average sentence length. The second, syllables ÷ words, is your average syllables per word. The constants weight these two factors so that they combine into a single 0–100 score that correlates with how difficult a text is to read.
How to Interpret the Score
Higher scores mean easier text. The table below maps score ranges to reading levels and the kinds of writing that typically fall in each band.
| Score | Reading level | Typical audience |
|---|---|---|
| 90–100 | Very Easy | 5th grade — children's books, basic instructions |
| 80–90 | Easy | 6th grade — popular fiction, consumer guides |
| 70–80 | Fairly Easy | 7th grade — conversational blog content |
| 60–70 | Standard | 8th–9th grade — most web content and news writing |
| 50–60 | Fairly Difficult | 10th–12th grade — aimed at educated readers |
| 30–50 | Difficult | College level — professional, academic, technical writing |
| 0–30 | Very Confusing | Graduate level — academic journals, dense legalese |
For most general-audience web content, aim for a score between 60 and 70 — the "Standard" range. This is the band that most successful consumer-facing articles and news writing fall into, and it is the target many SEO and content tools (such as Yoast) recommend.
A Worked Example
Consider this two-sentence passage: "The cat sat on the mat. It was a sunny day." It has 12 words, 2 sentences, and 14 syllables. Plugging those into the formula:
206.835 − 1.015 × (12 ÷ 2) − 84.6 × (14 ÷ 12) = 206.835 − 6.09 − 98.7 ≈ 102The raw result exceeds 100, so it is clamped to 100 — "Very Easy," appropriate for young readers. Compare that to a dense academic sentence full of long words and clauses, which might score in the 30s. The score is a fast, objective way to see how your sentence length and vocabulary complexity combine.
How to Improve Your Readability Score
Because the formula depends on only two variables, improving your score comes down to shortening sentences and simplifying words.
- Shorten your sentences. Aim for an average of 15–20 words. Break long sentences into two wherever there is a natural pause.
- Use shorter words. Replace multisyllabic words with simpler equivalents — "use" instead of "utilize," "help" instead of "facilitate."
- Cut the passive voice. Active voice is usually shorter and more direct.
- Break up long paragraphs. Short paragraphs improve perceived readability even though the score does not measure them directly.
- Read it aloud. If you run out of breath, the sentence is too long.
Why Readability Matters for SEO and Engagement
Readable content keeps visitors on the page longer and reduces bounce rate, both of which are positive engagement signals. Search engines increasingly reward content that matches the comprehension level of the searcher. For accessibility, readable content also reaches a broader audience, including non-native speakers and readers with cognitive differences.
Common Mistakes
- Treating a high score as the only goal — complex topics genuinely require complex vocabulary, and dumbing them down can hurt credibility.
- Chasing the number by chopping every sentence to under 10 words, which produces choppy, unnatural writing.
- Ignoring formatting — short paragraphs, subheadings, and bullet points improve perceived readability without changing the score.
- Using Flesch as the sole measure; it does not account for tone, structure, or technical accuracy.
Syllable counting is approximate
English syllable counts are estimated by a heuristic, not a dictionary lookup, so words with unusual pronunciations may be miscounted. Use the score as a directional guide — a shift of a few points is rarely meaningful, but a jump from 45 to 65 is.Frequently Asked Questions
What is a good readability score?
For general web content, target 60–70. For technical or professional audiences, 50–60 is acceptable. Children's content should be 80+.
Does readability affect search rankings?
It is an indirect signal. Readable content tends to engage readers longer and earn lower bounce rates, which correlate with better rankings over time.
Can I trust the syllable count for unusual words?
The estimate is accurate for most common English words but may be off for rare or irregularly pronounced words. Treat the overall score as a guide, not an exact measurement.
How to Use This Tool
- 1Paste your text into the input area.
- 2The Flesch Reading Ease score updates in real-time.
- 3Check the reading level label (e.g., 'Standard', 'Difficult').
- 4Use the average sentence length and syllable data to adjust your writing.