Sentence Counter
Sentence length is one of the most important factors in readability. Short, punchy sentences keep readers engaged, while overly long sentences can lose them. Our free Sentence Counter instantly counts every sentence in your text by detecting period, exclamation mark, and question mark endings. Beyond the raw count, you get the average number of words per sentence and can see which sentence is the longest and which is the shortest. This makes it easy to spot run-on sentences and fine-tune your writing rhythm. If you need a broader overview of your text structure, try the Paragraph Counter for paragraph-level analysis. All processing happens locally in your browser, so your text stays private. Results update in real time as you type or paste. Writers, editors, students, and content strategists use this tool to hit readability targets and improve their prose. For a complete word and character breakdown, the Word Counter complements this tool perfectly.
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Sentences
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Total Words
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Avg Words / Sentence
How to Use This Tool
- Paste or type your text into the editor above.
- View the sentence count, total words, and average words per sentence in the stats cards.
- Check the highlighted longest and shortest sentences to find areas for improvement.
- Review the numbered sentence list to verify accuracy and identify patterns.
Examples
| Input | Sentences | Avg Words |
|---|---|---|
| "The sun rose. Birds sang. A new day began." | 3 | 2.7 |
| "Is this a question? Yes! It is." | 3 | 2.3 |
| "No punctuation at the end" | 0 | 0 |
What This Tool Is Useful For
- Improving readability by identifying and shortening run-on sentences.
- Meeting style guide requirements for average sentence length in journalism or marketing copy.
- Analyzing student essays to check sentence variety and complexity.
- Editing speeches and presentations to maintain an engaging speaking rhythm.
- Benchmarking content against readability standards like the Flesch reading ease score.
Frequently Asked Questions
- How does the tool detect sentence boundaries?
- The tool identifies sentences by splitting on terminal punctuation marks: periods (.), exclamation marks (!), and question marks (?). Consecutive punctuation like '...' or '?!' is treated as a single boundary. This approach works well for standard English prose.
- Does it handle abbreviations like 'Dr.' or 'U.S.'?
- Common abbreviations with periods may be counted as sentence endings. For the most accurate count, consider spelling out abbreviations or reviewing the sentence list below the stats to verify accuracy. The tool prioritizes simplicity and speed over handling every edge case.
- What is a good average sentence length?
- Most readability guidelines recommend an average of 15 to 20 words per sentence for general audiences. Academic writing often averages 20 to 25 words. If your average exceeds 25 words, consider breaking longer sentences into shorter ones for clarity.
- Can I see which sentence is the longest?
- Yes. The tool highlights the longest and shortest sentences in color-coded cards below the summary stats. This helps you quickly identify sentences that may need to be shortened for readability or expanded for clarity.
- Is my data processed on a server?
- No. All sentence detection and counting happens in your browser using JavaScript. Your text never leaves your device, ensuring complete privacy for drafts, confidential documents, and sensitive content.
More Text Tools
- All Text Tools — browse the full collection of text utilities
- Paragraph Counter — count paragraphs and see per-paragraph breakdowns
- Reading Time Calculator — estimate reading and speaking time for your text
- Character Counter — count characters for Twitter, SMS, and SEO limits
- Yantrasagaram homepage
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