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Calculator Answers

Sentence Counter

Blake Boege
Written by Blake Boege · Founder, Calculator Answers

A sentence counter is a writing utility that calculates the total number of sentences in a given body of text. The calculator analyzes the text structure by detecting terminal punctuation marks, such as periods, question marks, and exclamation points, while applying filters to ignore common abbreviations, decimal numbers, and email addresses. Writers, editors, and students use this tool to assess readability, control sentence length, and meet structural writing constraints for essays, academic research papers, and web content publishing guidelines.

Paste any text and we count the sentences, words, and characters, plus the average words per sentence. A quick way to spot run-on paragraphs, oversized openings, or text that needs more rhythm.

See also: Syllable Counter, Paragraph Counter, and Character Counter.

Quick Answer

Count the total number of sentences in your text. Paste your copy to see the sentence count, average sentence length, and readability metrics.

Counts update live. Sentences are split on periods, question marks, exclamation points, and ellipses.

Sentence breakdown

Sentences

4

37 words · 229 characters

Sentences4
Words37
Characters (with spaces)229
Characters (no spaces)193
Avg words / sentence9.3
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Examples

"Hello. This is a test."

2 sentences · 5 words · 2.5 words/sentence

Three short sentences in a row

3 sentences · varies

One long sentence with two clauses, joined by a comma

1 sentence

How it works

We split text on periods, question marks, exclamation points, and ellipses followed by whitespace or end of text. Empty fragments are dropped.

Sentences · text matches /[^.!?…]+[.!?…]+(\s|end)/

Abbreviations with internal periods (e.g., U.S.A.) may inflate the count. Eyeball heavy-abbreviation text after running it.

Related Calculators

More tools from Writing

Syllable CounterEstimate the number of syllables in any text, plus words, sentences, and average syllables per word.Paragraph CounterCount paragraphs, words, and sentences in any text, with average words per paragraph.Character CounterCount characters with and without spaces, plus words, lines, and paragraphs — perfect for limit-bound writing.Word CounterCount words, characters, sentences, and paragraphs in real time, with reading and speaking time estimates.

Frequently asked questions

We split on terminal punctuation: a period, question mark, exclamation point, or ellipsis followed by whitespace or end of text. So "This is one sentence. This is another." counts as two.

Imperfectly. A naive splitter treats every period as a sentence boundary, which over-counts in text with abbreviations. We try to be generous about runs of consecutive terminators (like "...") but won't catch every case. Spot-check long, abbreviation-heavy text by eye.

For most general writing, 15–20 words is comfortable. Plain-language guidelines (used by government and healthcare publications) often recommend 14 or fewer. Higher averages aren't wrong, but consistently long sentences tire readers — vary the length.

Word processors use slightly different splitters and may treat headings, bullets, or trailing newlines differently. The sentence count here is based on terminator punctuation in the visible text. If you're optimizing for a specific tool's metric, copy the result from that tool directly.