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Sentence Length Analyzer

List every sentence with its word count and see the average, the longest, the shortest and a readability note.

Sentence length analyzer

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Sentence splitting and scoring run locally in your browser.

How to use the Sentence Length Analyzer

  1. Paste the text you want to check into the input box.
  2. Set the word count above which a sentence is flagged as long.
  3. Read the per-sentence list, the averages and the readability note.

Features

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Frequently Asked Questions

Common questions about the free online sentence length analyzer.

The text is split after a full stop, question mark or exclamation mark when the next word starts with a capital or a number.
Most plain-English guidance suggests an average of 15 to 20 words, with anything over 25 words treated as a long sentence.
It uses the Flesch reading ease formula, which combines average sentence length with average syllables per word to score the text.
It estimates the US school grade level of the text. A grade of 8 means roughly eighth-grade reading level, which suits most readers.
Contractions such as it is and don't count as one word, while hyphenated words count as two or more separate words.
Yes. Tick Sort by length to list the longest sentences first, which is handy when you are trimming a bloated paragraph.
No. All splitting and scoring happen locally in your browser, so your text is never sent anywhere.
Yes. The analyzer is fully responsive and works in any modern browser on desktop, tablet and phone.
Yes. The sentence length analyzer is completely free, with no account, no sign-up and no usage caps.

Last updated: October 10, 2026