Free Sentence Counter – Count Sentences, Words & Paragraphs

What a Sentence Counter Measures and How Sentences Are Detected

This counts the sentences in your text, along with words, paragraphs and characters, and adds two figures that matter more than the raw count: your average words per sentence and the length of your longest one. Students meeting an assignment requirement need the count. Editors and bloggers need the averages, because sentence length is the single biggest lever on how readable a piece feels. A page of 35-word sentences exhausts a reader regardless of how good the argument is. Nothing here needs a submit button; the numbers move as you type. Detection splits the text on terminal punctuation — full stops, question marks and exclamation marks — where the mark is followed by whitespace or the end of the text. Empty fragments and stray whitespace between sentences are discarded so they do not inflate the count. Words come from splitting on whitespace, paragraphs from blank lines between blocks. The average is simply the word total divided by the sentence total, and the longest-sentence figure is the highest word count among the individual sentences. That last number is often the more useful of the two, because one 60-word monster can drag a comfortable average up and hide the fact that a single sentence is doing all the damage. A worked example. Paste this: The library opens at nine. Members can borrow up to six books at a time, and renewals are handled online through the member portal without any need to visit the front desk in person. Are late fees still charged? Three terminal marks mean three sentences. The word total is 39, so the average is 39 ÷ 3 = 13 words per sentence, which reads as comfortable. But look at the individual lengths: 5 words, 29 words, 5 words. The middle sentence is nearly six times the length of its neighbours, and that is exactly the imbalance a healthy-looking average conceals. Specific uses. A university student checks a reflective piece against a 20-sentence minimum before submitting. A content editor reviewing a guest post finds a 52-word sentence in the opening paragraph and splits it in two. A UX writer keeps microcopy under 15 words per sentence so it fits on a phone screen without wrapping awkwardly. A press officer drafting a quote for a release checks it is one clean sentence a journalist can lift whole. A teacher marking primary-school writing uses the average to show a pupil that every sentence in their story is the same length. A translator checks that their target text has not silently merged two source sentences into one, since the sentence count should usually match the original within a sentence or two. A copywriter reviewing an ad script confirms the whole message fits into four short sentences a voice artist can deliver inside a thirty-second slot. Aim for an average between 15 and 20 words for general and web writing, and treat any single sentence past 40 words as a candidate for splitting. Varying length matters as much as the average — alternating short and long sentences is what makes prose feel alive, and a uniform 18 words throughout reads as flat as a uniform 40. The genuine limitation is abbreviations. A full stop in Dr. Sharma, 4 p.m. or Ltd. looks identical to a sentence ending, so those inflate the count. If precision matters, spell abbreviations out or check the figure manually. Semicolons and dashes also join what a reader experiences as two separate sentences into a single one by this count, which nudges your average upwards. Analysis runs in your browser, so drafts and confidential text are never uploaded, stored or logged.

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