Sentence Counter Text
Count sentences and see average sentence and word length.
Sentence Counter is a free online tool that count sentences and see average sentence and word length. It runs entirely in your web browser using plain JavaScript, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.
- Price
- Free — no account, no quota, no watermark
- Category
- Text
- Where it runs
- In your browser, on your device
- Files uploaded
- None
- Technology
- plain JavaScript
- Settings
- None — it just works
- Works offline
- Yes, after the first visit
About Sentence Counter
Sentence boundaries are detected from terminal punctuation followed by whitespace, with the common abbreviations excluded — "Dr.", "Mr.", "e.g." and "etc." would otherwise each end a sentence. That heuristic is right for ordinary prose and will miscount technical text dense with decimals, version numbers or unusual abbreviations. Treat the figure as a good estimate, not a parse.
How to use it
- Paste or type your text. Every figure recalculates on each keystroke.
- Use the sample button to see what the numbers look like on real prose.
Under the hood
| Runs on | plain JavaScript — runs the whole thing |
Questions
What counts as a sentence?
A span ending in a full stop, question mark or exclamation mark followed by whitespace or the end of the text. Ellipses are treated as one terminator, not three.
Why does average sentence length matter?
It is the main lever in every readability formula. Under 20 words per sentence reads comfortably for a general audience; over 25 is where comprehension measurably drops.