Sentence Counter
Count sentences, examine average sentence lengths, and optimize writing readability. Runs 100% locally in your browser.
Character Limit Checker
Set a custom character limit or select a preset below to see live countdown and progress alerts.
Social Media & SEO Character Limits
Tap any preset card to load its character limit directly into the live counter.
What Is a Sentence Counter?
A sentence counter is an editorial text tool that calculates the total number of complete sentence units within a text. In addition to raw sentence counting, it calculates the ratio of words per sentence, which is the foundational variable in readability formulas like Flesch-Kincaid, Gunning Fog, and the Automated Readability Index (ARI).
Need to measure characters or words as well? Return to our primary free character counter or visit the word counter online.
Sentence Length & Readability Benchmarks
How sentence lengths directly impact audience comprehension:
Best for marketing copy, calls-to-action, and bold introductions.
Ideal for blog articles, news stories, and technical guides.
Common in university papers, analysis essays, and literature.
High fatigue risk. Consider splitting into two distinct sentences.
Sentence Counter FAQs
How is a sentence defined in this counter?
A sentence is defined as a grammatical unit ending with terminal punctuation (period, exclamation mark, question mark, or ellipsis) followed by whitespace or the end of the text. Abbreviations (such as "e.g.", "Dr.", or "Inc.") are handled intelligently using standard Unicode sentence break segmentation.
What is the ideal average sentence length for readability?
For general web copy, blog posts, and journalism, writing experts recommend an average sentence length of 14 to 18 words. Sentences averaging over 25 words become difficult for readers to process, reducing overall comprehension.
Does this tool detect the longest and shortest sentences?
Yes! Expand the "Detailed Text Statistics & Reading Metrics" drawer below the main counter to view your average sentence length and inspect your draft's longest sentence.
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