Sentence Counter
Count the number of sentences, words, and paragraphs in any block of text instantly.
Free online sentence counter
A sentence counter tells you how many sentences are in a passage of text, along with the number of words and paragraphs. ProseTool's sentence counter works live as you type, making it easy to meet assignment requirements, tighten your prose, or balance the length of your sentences.
Counting sentences matters because sentence length is one of the strongest signals of readability. Long, winding sentences tire readers and bury your point; a steady stream of very short sentences can feel choppy. Seeing the count — and the average words per sentence — helps you find the right balance.
How to use the sentence counter
- Type or paste your text into the box above.
- Read the live stats: sentences, words, paragraphs, and average words per sentence.
- Use the average to spot sentences that are running too long.
- Click Copy stats to save a quick summary, or Clear to reset.
Features
- Accurate sentence detection across periods, question marks, and exclamation points.
- Words and paragraphs counted at the same time for full context.
- Average words per sentence to gauge readability at a glance.
- Live updates with every keystroke — no button required.
- Private and free — runs in your browser, with no limits.
Benefits of counting sentences
Teachers and editors often set requirements in sentences as well as words. Students writing summaries, professionals drafting concise emails, and copywriters crafting tight ad copy all benefit from knowing the exact sentence count. The average-words-per-sentence figure is especially useful: keep it in the mid-teens and most readers will find your writing effortless to follow.
Sentence variety is the secret behind prose that flows. Use the counter to audit a draft, then break up the longest sentences and combine the shortest. Small adjustments to sentence length can transform a dense paragraph into something clear and persuasive.
Frequently asked questions
How does the tool count a sentence?
A sentence is counted each time the text ends with a terminating punctuation mark — a period, question mark, or exclamation point (including grouped marks like "?!"). Trailing text without punctuation is still counted as one sentence so nothing is missed.
Why does my abbreviation count as a sentence?
Periods inside abbreviations like "e.g." or "Dr." look like sentence endings to any automatic counter. For the most accurate count, the tool merges adjacent periods, but heavy abbreviation use can still nudge the number slightly.
What is a good average sentence length?
For clear, readable prose aim for an average of 15–20 words per sentence. Mixing short and long sentences creates rhythm. Averages above 25 words often signal text that is hard to follow.
Is anything I type stored?
No. The sentence counter runs entirely in your browser. Your text is never uploaded or saved anywhere.