Sentence counter
Count sentences, paragraphs and average sentence length. Results update as you type.
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How the sentence counter works
The sentence counter detects sentences by identifying ending punctuation — periods, exclamation marks, and question marks. It intelligently handles common exceptions to avoid false counts. Abbreviations like Mr., Dr., and U.S.A. are recognized and not counted as sentence endings. Decimal numbers like 3.14 and 99.9 are handled correctly. Ellipses are treated as single sentence endings rather than three separate periods. The result is an accurate sentence count even for complex professional text.
Sentence length distribution
The distribution chart shows how your sentences break down by length category. Short sentences of 1 to 10 words are punchy and easy to read but too many can make text feel choppy. Medium sentences of 11 to 20 words carry most of the content in well-written prose and are the ideal target range. Long sentences of 21 to 30 words add complexity and nuance but should be used sparingly. Very long sentences of 31 or more words are difficult to follow and should almost always be broken into shorter ones.
Good writing varies sentence length to create rhythm. A mix of short, medium, and occasional long sentences reads more naturally than text where every sentence is the same length. If your distribution shows mostly very long sentences, the reading level checker will likely show a high difficulty score — break them up to improve both readability and comprehension.
What is the ideal sentence length
Most readability guidelines recommend an average sentence length of 15 to 20 words for general web content. The US government's plain language guidelines recommend no more than 20 words per sentence. Hemingway's famous style averaged around 10 words per sentence. Academic writing often averages 25 to 30 words per sentence. For blog posts and marketing copy targeting a general US audience, aim for 15 to 18 words average with significant variation between sentences.
Paragraphs and sentence structure
For web content, paragraphs of 2 to 4 sentences work best. Long paragraphs of 6 or more sentences are harder to read on screen, especially on mobile devices where the viewport is narrow. Short paragraphs create visual white space that makes text feel less intimidating and easier to scan. If the sentence counter shows you have paragraphs averaging 6 or more sentences, consider splitting them to improve the mobile reading experience.
Frequently asked questions
How does the sentence counter work?
It detects sentences by looking for ending punctuation — periods, exclamation marks, and question marks — while handling abbreviations, decimal numbers, and ellipses to avoid false counts. Results update instantly as you type.
What is the ideal sentence length for readability?
Most readability guidelines recommend 15 to 20 words average for general web content. Sentences over 30 words are generally too long for comfortable reading.
How many sentences should a paragraph have?
For web content, 2 to 4 sentences per paragraph works best. Long paragraphs are harder to read on screen, especially on mobile.
What is the difference between a sentence and a paragraph counter?
A sentence counter counts sentences ending with punctuation. A paragraph counter counts blocks of text separated by blank lines. Both together give a complete picture of your text structure.
Can I count sentences in multiple paragraphs?
Yes. The counter handles text of any length including multiple paragraphs and shows a complete breakdown of all sentence statistics across the entire text.