Readability Score

Readability scoring answers one question: roughly what school grade can comfortably read this passage. This tool grades pasted text live, pairs the number with a plain-language band from elementary to graduate level, and suggests concrete fixes when sentences run long.

Two formulas, honestly separated

English uses the standard Flesch-Kincaid grade — a weighted mix of average sentence length and average syllables per word — alongside the 0-to-100 Reading Ease scale. Chinese cannot use that formula, so it is graded by average sentence length instead: around 8 characters per sentence reads as early elementary, 25 to 35 as secondary school, 50-plus as university. The page always tells you which formula is scoring, and English-only extras like syllable counts hide themselves on Chinese text.

The supporting numbers

Four cards show sentence count, word or character count, average sentence length and the share of long sentences — over 25 words in English, over 40 characters in Chinese. Warnings name the exact problem: very long sentences, a high long-sentence share, or a sample too short to judge.

When you would use it

It settles debates in three places:

• Smooth a help-center article before release
• Check whether a translated page kept its reading level
• Settle an editing argument about a paragraph everyone finds heavy

Honest limits

Chinese grading is a sentence-length approximation without dictionary parsing, English syllable counts are heuristic, and mixed-language passages are graded as Chinese. Grades describe difficulty, never quality.

Privacy

Privacy is straightforward here: scoring happens in the browser on every keystroke, and your text is never sent to a server.