Long sentences tire readers. Our free Average Sentence Length Calculator measures your average words per sentence, helping you write clearer, more readable copy.
Sentences are detected at full stops, exclamation marks and question marks. Abbreviations like e.g. may be split — treat the result as a guide. Everything runs in your browser; nothing is uploaded.
How to Use
- Paste or type your text into the box.
- The average words per sentence updates instantly.
- Aim for an average of 15–20 words for general writing.
- Shorten any very long sentences you spot.
- Re-check after editing to see your new average.
Key Features
- Instant average words-per-sentence calculation.
- Sentence and word counts included.
- Detects full stops, exclamation and question marks.
- Updates live as you type.
- 100% private — everything runs in your browser.
FAQs
What is a good average sentence length?
15–20 words suits most general writing. Web copy and news often aim lower (12–17), while academic writing runs higher. Variety matters more than any single number.
Why does sentence length matter?
Shorter sentences are easier to parse and remember. Very long sentences increase cognitive load and lose readers — especially on screens.
How are sentences detected?
At full stops, exclamation marks and question marks. Abbreviations such as e.g. or Mr. can be misread as sentence ends, so treat the result as a guide rather than gospel.
Should all my sentences be short?
No — monotonous short sentences feel choppy. Mix short punchy sentences with longer flowing ones, and keep the average in a comfortable range.
Is my text sent anywhere?
No. The calculator runs entirely in your browser with JavaScript, so your text never leaves your device.
Related Tools
You may also like our Sentence Counter, Readability Checker and Average Word Length Calculator.