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✦ Free ToolText
Sentence Counter
A free sentence counter that instantly counts sentences and reports average, longest, and shortest sentence length in words.
How the Sentence Counter works
Text is split into sentences at periods, exclamation points, and question marks. Type or paste text and the count updates live.
Why average sentence length matters
Very long average sentence length can hurt readability; a mix of short and long sentences generally reads better. This tool surfaces the longest and shortest sentence so you can spot outliers.
Common Mistakes to Avoid
Missing sentences that end in abbreviations
Solution:
Periods after abbreviations (e.g., "Dr.", "U.S.") can be miscounted as sentence endings by simple splitting rules — review the result for accuracy in text with many abbreviations.
Confusing sentence count with clause count
Solution:
A sentence can contain multiple clauses joined by commas or conjunctions — this tool counts full sentences (ending in . ! or ?), not individual clauses.
Treating one very long sentence as ideal
Solution:
A single long sentence often hurts readability more than several shorter ones — check the "longest sentence" stat to spot run-on sentences.
Frequently Asked Questions
Yes — live, no button required.
By splitting text at periods, exclamation points, and question marks.
No — everything runs locally in your browser.
Yes — both are shown in words.
Free Sentence Counter
Count sentences instantly as you type, with average words per sentence and the longest and shortest sentence lengths — useful for checking readability.
What You Get
- Live sentence count
- Average words per sentence
- Longest and shortest sentence length
- No signup, no data stored — everything runs in your browser
Who Uses This Tool
Writers and editors checking sentence variety and readability, and students meeting a sentence-count requirement.