Sentence Counter

Count sentences and check their average length.

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What does Sentence Counter do?

Count the sentences in a piece of writing and see the average sentence length, the longest sentence, and how the lengths are distributed. Long sentences are the single biggest driver of poor readability.

How to Use Sentence Counter

1
Paste your textA paragraph or a whole document.
2
Read the summarySentence count and average length appear immediately.
3
Find the long onesThe listed longest sentences are the ones to split.

Key Features

Accurate sentence detection that ignores abbreviations such as Dr. and e.g.
Average, shortest and longest sentence lengths
Distribution chart showing where the long sentences cluster
Highlights sentences over 25 words, the usual readability threshold
Words per sentence feeds directly into the readability scores

Frequently Asked Questions

How are sentences detected?

By splitting on full stops, question marks and exclamation marks that are followed by whitespace or the end of the text, with a list of common abbreviations excluded so "Dr. Smith" is not two sentences.

What is a good average sentence length?

15–20 words for general writing. Above 25 the reader has to hold too much in mind at once. Varying the length matters as much as the average — a run of same-length sentences reads as monotonous.

Does it handle abbreviations correctly?

Mostly. Titles, e.g., i.e., etc. and common business abbreviations are recognised. Unusual abbreviations followed by a capital letter may still be miscounted — no rule-based splitter is perfect.

Why does my count differ from Word?

Different tools apply different rules to ellipses, quoted sentences, headings and list items. Differences of a few percent on a long document are normal.