Count sentences, paragraphs, and average sentence length. Get an instant readability score and see each sentence highlighted with its word count.
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A sentence counter counts the number of sentences in a piece of text, along with related statistics like average sentence length, paragraph count, and readability score. It's an essential tool for writers, editors, students, and SEO professionals who want to ensure their writing is clear, well-structured, and appropriately complex for their audience.
The Flesch Reading Ease formula calculates readability based on average sentence length and average number of syllables per word. The higher the score, the easier the text is to read. Most web content should aim for a score of 60 or above — roughly the reading level of a 13–15 year old, which covers the vast majority of online readers.
Sentences are detected by looking for end punctuation marks — periods (.), exclamation points (!), and question marks (?). The tool handles common exceptions like abbreviations (Mr., Dr., etc.) and decimal numbers. If no punctuation is found but text exists, it counts the entire text as one sentence.
For most online content, an average sentence length of 15–20 words is ideal. Academic writing typically ranges from 20–25 words. Anything consistently above 30 words per sentence becomes difficult to follow for average readers. Vary your sentence length for the most engaging writing.
The Flesch Reading Ease score (0–100) measures how easy a text is to read. Higher scores mean easier reading. Scores above 70 are easy for most adults. Scores below 30 are typically academic or technical text. The formula considers both average sentence length and average syllables per word.
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