Skip to content
TextArray
100% local

Sentence counter

Count sentences, paragraphs and average sentence length, and flag overlong sentences.

Input
Output
Related tools
Word and character counterBasic tools
Readability score checkerBasic tools
Reading time calculatorBasic tools
Word frequency counterBasic tools
Pangram checkernewBasic tools
Find and replaceBasic tools
Sentence counter
Paste your text and get an instant structural report: sentences, words, paragraphs, non-empty lines, the average number of words per sentence, the average number of sentences per paragraph, and the longest and shortest sentence by word count. Everything recalculates as you type, so you can rework a paragraph and watch the averages settle exactly where you want them.
The sentence counter is for writing where structure matters as much as length. Essays and exam answers often come with sentence limits — summarise in five sentences, one paragraph of no more than eight. Translators and copywriters quote work by volume and need a sentence count next to the word count. Teachers use the report to check the shape of a student's text at a glance: twelve short statements read very differently from three sprawling run-ons, even at the same word count.
Average sentence length is the quickest readability signal there is. General prose sits comfortably around 15 to 20 words per sentence; a consistently higher average is worth an editing pass. Set "Flag sentences over N words" and every sentence above the threshold is listed under the report with its word count, so run-on sentences are easy to find and fix. The splitter is pragmatic: sentences end at a full stop, exclamation mark, question mark or ellipsis followed by a space, while decimal numbers such as 3.14, initials such as J. K. and common titles such as Dr. do not break a sentence.
Your text is processed entirely in your browser and never uploaded anywhere, so drafts, client copy and confidential documents are safe here. Copy the report or download it as a .txt file when you are done.
FAQ
How are sentences detected?
A sentence ends at a full stop, exclamation mark, question mark or ellipsis followed by a space or the end of the text. Decimal numbers like 3.14, initials like J. K. and common titles like Dr. do not split a sentence, and a full stop followed by a lowercase letter is treated as an abbreviation. Unusual abbreviations can still shift the count by a sentence or two.
What if my text has no sentence punctuation?
The whole text counts as one sentence. Headings without a closing full stop merge into the sentence that follows them, so add punctuation where you want boundaries.
What does "Flag sentences over N words" do?
Every sentence longer than the threshold is listed under the report with its word count in brackets. Very long sentences are shortened to about 120 characters in the list so the report stays readable.
What is a good average sentence length?
General prose reads comfortably at around 15 to 20 words per sentence. Technical and legal writing runs longer, marketing copy shorter — treat a consistently higher average as a hint to edit, not a hard rule.
Is my text uploaded anywhere?
No. The tool runs entirely in your browser and your text never leaves your device.