This free sentence counter breaks your writing down sentence by sentence as you type. See the total number of sentences, your average sentence length, the longest and shortest sentence, and a Flesch reading-ease score — a fast way to tighten essays, blog posts, and marketing copy for readability.
100% private: all text analysis runs locally in your browser — your text is never uploaded.
Readability Score
Sentence Breakdown
Text Tools
Why Use a Sentence Counter?
Sentence count matters more than most writers realize. Whether you're optimizing blog posts for readability, preparing an essay, or polishing marketing copy, understanding your sentence structure helps you write clearer, more engaging content.
Ideal Sentence Length for Different Contexts
- Web content & blogs: 15–20 words per sentence
- Academic writing: 20–25 words per sentence
- Marketing copy: 10–15 words per sentence
- Social media: 8–12 words per sentence
- Technical documentation: 15–20 words per sentence
- Children's content: 5–10 words per sentence
Understanding Readability Scores
The Flesch Reading Ease score ranges from 0 to 100. Higher scores mean easier reading:
- 90–100: Very easy — 5th grade level
- 80–89: Easy — 6th grade level
- 70–79: Fairly easy — 7th grade level
- 60–69: Standard — 8th–9th grade (ideal for most web content)
- 50–59: Fairly difficult — 10th–12th grade
- 30–49: Difficult — college level
- 0–29: Very difficult — graduate/professional level
Tips for Better Sentence Structure
Mix short and long sentences to create rhythm. Use shorter sentences for emphasis and impact. Use longer sentences to explain complex ideas. Aim for variety — if every sentence is the same length, your writing will feel monotonous.
Related Tools and Guides
Need full text analysis with character counting, keyword density, and more? Use the main Character Counter and Word Counter. Writing to a specific length? Try the 155 Character Counter for meta descriptions or the 4000 Characters in Words page for longer copy. For a deeper SEO walkthrough, read Ideal Meta Description Length in 2026.
Browser-Based Sentence Analysis
All text analysis runs locally in your browser — your text is never uploaded. Sentence counting and readability scoring are computed on your device with JavaScript, so nothing you type is sent to a server, stored, or logged. The page itself may still load normal site services such as analytics, ads, or newsletter features, but those never receive the contents of your text.