Readability Analysis: Making Your Content Easier to Read
A readability score can prompt you to inspect long sentences and vocabulary. It cannot check facts, detect a missing condition in an instruction or prove that a reader understands the text. Here we separate the formulas, this tool’s implementation and human review, using complete examples that you can recalculate.
What does Flesch Reading Ease measure?
The English formula uses words per sentence and syllables per word:
FRE = 206.835 − 1.015 × (W ÷ S) − 84.6 × (Y ÷ W)
W is the word count, S the sentence count and Y the syllable count. Flesch-Kincaid Grade Level uses different coefficients: 0.39 × (W ÷ S) + 11.8 × (Y ÷ W) − 15.59. Neither establishes an individual reader’s ability or a Chinese-language education level.
This tool estimates English syllables, rounds FRE and clips it to 0–100. The raw formula can exceed that range. Syllables are estimated from vowel groups, not a pronunciation dictionary. Names, abbreviations, numbers and mixed-language text can distort the result. Sentence splitting uses punctuation and line breaks and does not fully recognize periods inside abbreviations.
A reproducible example: splitting a sentence may leave the display unchanged
These are complete, constructed examples, not samples from a genre study. Every word is treated as one syllable here. Only punctuation and the capitalization of and change.
| Complete text | W | S | Y | Raw FRE | Tool display |
|---|---|---|---|---|---|
| The cat sat on the mat and the dog slept by the door. | 13 | 1 | 13 | 109.04 | 100 |
| The cat sat on the mat. And the dog slept by the door. | 13 | 2 | 13 | 115.64 | 100 |
Substitute W, S and Y into the formula to reproduce the raw scores. Paste each complete example into the tool to check its sentence count and displayed score. Both display 100 because of the upper limit, not because they are equally suitable for every reader. This demonstrates formula behavior; it does not establish the difficulty of an entire genre.
The Chinese score is a custom heuristic
The tool does not apply English syllable formulas directly to Chinese. Its custom heuristic considers average sentence length, long-sentence share, paragraph length and preset markers for classical characters, abstract suffixes and formal phrases, producing a 0–100 editing prompt.
This scoring method is not independently validated with reader-comprehension tests. It is not an education, language-proficiency or medical assessment. Chinese and English follow different rules, so their scores are not comparable. Comparing revisions of the same draft is a more appropriate use.
A marker list does not understand full context. For example, the classical-character list includes 胡, so the surname in 胡先生到了。 can trigger a difficulty penalty. A short sentence can still contain unexplained jargon, and a low score does not mean necessary information should be removed. Counting Japanese, Korean or other languages does not establish a valid readability assessment for those languages.
Check meaning and action when rewriting
Original constructed example: 請先登入帳號確認收件地址無誤後再送出申請。
Revised example: 請先登入帳號。確認收件地址無誤後，再送出申請。
The revision separates steps while preserving their order: sign in, verify the delivery address, then submit. Paste both versions into the tool to compare indicators, then ask a target reader to explain the next action.
- Identify the reader’s task. Put the answer or required action where the reader can find it.
- Review overloaded sentences. Separate actions while preserving deadlines, exceptions, responsibilities and causal relationships.
- Explain essential terms. Keep an accurate specialist term when needed, then give a plain definition and an example.
- Check with people. Ask intended readers to restate the meaning or complete the task, and record where they struggle. An average sentence length cannot do this for you.
What can this tell you about SEO?
Google’s guidance emphasizes useful, trustworthy content that satisfies people’s needs. A higher tool score does not guarantee better search rankings, dwell time, sharing or impressions. Check factual accuracy, task completion and the actual query and page changes in Search Console separately.
Review a draft with the Word Counter →