Sentence Counter
Count sentences in any text instantly with a live preview. This free sentence counter also reports your word count, average sentence length, and longest and shortest sentence — so you can see not just how many sentences you have, but how well they read.
Whether you call it sentence counter or sentences counter, this free tool handles it instantly in your browser.
Example usage
Example input
This is one sentence. This is another! Is this the third?
Example output
Sentences 3 Words 11 Average sentence length 3.7 words
Batch Processing
Enter multiple inputs, one per line. Each line will be processed separately.
Why this tool?
Everything runs right in your browser — no uploads, no sign-up, no waiting. Your text never leaves your device.
Quick tips
- •Outputs update live as you type.
- •Use the sticky copy button to grab results quickly.
- •Bookmark this page for fast access.
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How it works
- The tool scans punctuation patterns to identify likely sentence boundaries.
- Common sentence endings such as period, question mark, and exclamation mark are counted.
- Word count, average sentence length, and your longest and shortest sentence are derived from those boundaries.
- The whole breakdown updates instantly as you type or paste text.
Use cases
What actually counts as a sentence?
Counting sentences sounds trivial — split on periods — until real text arrives. Abbreviations like "Dr." and "e.g." contain periods that end nothing. Decimal numbers (3.14) and URLs are full of dots. Ellipses… sometimes end a sentence and sometimes trail into the next clause. Question marks and exclamation points end sentences, but a quoted question inside a statement ("Did she really say ‘why me?’ yesterday") should count once, not twice.
This counter uses boundary rules that handle the common cases — terminal punctuation followed by whitespace and a capital letter — which matches how style guides define sentence boundaries closely enough for essays, articles, and posts.
Using sentence counts to improve writing
Sentence count is most useful as a ratio. Divide your word count by your sentence count to get average sentence length: readability research puts comfortable web writing around 15–20 words per sentence, while academic writing tolerates 25 or more. If your average tops 30, readers will struggle — split compound sentences.
Teachers often set sentence-count requirements ("a paragraph of 5–7 sentences") precisely because beginning writers either fragment or run on. Checking your draft here takes seconds and catches both failure modes: a 200-word paragraph with 3 sentences runs long, and one with 15 is choppy.
Counting and Utility
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Browse every tool for this kind of task, along with helpful guides that show you how to get the most out of them.
Related tools
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Conversion History
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FAQ
How many sentences is this?
Paste your text into the box above and the sentence count appears instantly, with no signup and nothing uploaded. Alongside the total you also get the word count, the average sentence length, and your longest and shortest sentence, so you can see how many sentences you have and how they are balanced.
How does this sentence counter detect sentences?
A sentence boundary is counted at terminal punctuation — a period, question mark, or exclamation point — followed by whitespace or the end of the text. Consecutive marks such as "?!" count once. Abbreviations and decimals are the usual edge cases, so treat the count as accurate for ordinary prose rather than as a parser for legal or scientific notation.
What is a good average sentence length?
For web writing, 15–20 words per sentence reads comfortably; academic prose tolerates 25 or more. Below about 8 words the text starts to feel choppy, and above 30 readers lose the thread. This tool reports your average automatically and flags it when it falls outside the comfortable range.
Can I use it for essays and long documents?
Yes. You can paste long text and get an instant sentence count for essays, articles, and reports.
Does this tool save my text?
No. Processing happens in your browser, so your text is not uploaded or stored.