📖 Sentence Counter
Count sentences and average sentence length in your text free. Improve readability with instant analysis, no upload.
📖 Sentence Counter
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About the Sentence Counter Tool
Sentence length is one of the strongest predictors of how easy a piece of writing is to read. Long sentences carry more clauses, more subordination, and more for the reader to hold in mind before reaching the point.
Counting sentences and calculating average length gives you an objective measure of that. Most readability guidance suggests an average of 15–20 words for general audiences, with variation between sentences to avoid monotony. Analysis runs entirely in your browser.
How to Use Sentence Counter
- Paste your text into the input area.
- The sentence count and average length are calculated immediately.
- Compare the average against your target readability level.
- Break up overlong sentences and re-check.
When to Use This Tool
- Checking readability of web copy for a general audience
- Analysing academic writing for excessive sentence complexity
- Editing content down to a target reading level
- Assessing whether a draft varies its sentence rhythm
- Preparing content for readers who are not native speakers
Things Worth Knowing
- Sentence detection uses terminal punctuation, so abbreviations like Dr. and e.g. can be miscounted.
- An average of 15–20 words suits general web content; academic writing typically runs longer.
- Variation matters as much as the average — uniformly medium sentences read monotonously.
Quick Facts
| Tool name | Sentence Counter |
| Category | Text Tools |
| Price | Free — no account, no trial, no watermark |
| Where it runs | Entirely in your browser (client-side) |
| Files uploaded | None — your data never leaves your device |
| File size limit | None imposed; limited only by device memory |
| Works offline | Yes, once the page has loaded |
| Platforms | Windows, macOS, Linux, Android, iOS |
Frequently Asked Questions
How are sentences detected?
By terminal punctuation — full stops, question marks, and exclamation marks. Abbreviations containing full stops can occasionally be counted as sentence ends, which is a known limitation of simple detection.
What is a good average sentence length?
Around 15–20 words for general web content. Below 12 can feel choppy; above 25 becomes demanding. Technical and academic writing conventionally runs longer.
Does sentence length affect SEO?
Not directly. It affects readability, which affects how long people stay on your page and whether they finish reading — and those engagement signals do matter.
Should every sentence be short?
No. Uniform length is monotonous regardless of what that length is. Good prose varies deliberately, using short sentences for emphasis after longer ones.