Sentence Counter — Free Online Tool
Last updated: January 2025
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What is Sentence Counter?
Sentence Counter counts the number of sentences in your text and calculates the average sentence length.
When to use Sentence Counter?
Use it to analyze writing style, check readability, ensure varied sentence lengths, and improve content quality.
How to use this tool
- 1Paste your text in the input area
- 2Click 'Analyze' to count sentences
- 3View sentence count and average length
Examples
| Input | Output |
|---|---|
| Hello. How are you? I am fine! | 3 sentences |
| One sentence only. | 1 sentence |
| Short. Medium length sentence. This one is considerably longer than the others. | 3 sentences | Avg: varies |
| (500-word article) | Approx. 25-33 sentences at ideal avg length |
| Multiple! Types? Of punctuation. | 3 sentences detected |
Rules & Behavior
- Sentences detected by . ! ? end punctuation
- Average sentence length shown in words
- Ideal average sentence length: 15-20 words for readability
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Frequently Asked Questions
How are sentences detected?
Sentences are identified by period (.), exclamation mark (!), and question mark (?) followed by whitespace. Abbreviations may occasionally be counted incorrectly.
What is a good average sentence length?
For clear, readable writing, aim for 15-20 words per sentence. Shorter is better for web content; academic writing often uses longer sentences.
Why is my sentence count off?
Abbreviations (Mr., Dr., etc.) can be misidentified as sentence ends. Also, sentences without terminal punctuation may not be counted.
How does sentence length affect readability?
Varied sentence lengths improve reading flow. Very long sentences (30+ words) reduce readability. Short sentences (under 10 words) create emphasis but can feel choppy.
Can it analyze multiple paragraphs?
Yes, paste any amount of text and the tool will analyze all sentences across all paragraphs.