Sentence Counter

What Is a Sentence Counter?

A sentence counter analyzes your text to count the number of sentences and provide insights about sentence length, readability, and writing style. It goes beyond simple counting by calculating average words per sentence, identifying your longest sentence, and computing a readability score. This information helps you write clearer, more engaging content.

What Makes a Good Sentence Length?

Research in readability suggests that the ideal average sentence length for most writing is 15–20 words. Sentences under 10 words feel choppy and fragmented. Sentences over 30 words become difficult to follow and increase cognitive load. The best writing varies sentence length — mixing short punchy sentences with longer explanatory ones creates a natural rhythm that keeps readers engaged.

Flesch Reading Ease Explained

The Flesch Reading Ease score is one of the most widely used readability metrics. It produces a number between 0 and 100, where higher scores indicate easier text. Scores of 80–100 are easily understood by an average 11-year-old. Scores of 60–70 are understood by 13–15-year-olds. Scores below 30 are best understood by university graduates. The formula considers both sentence length and syllable count per word.

Hemingway-Style Writing

Ernest Hemingway was famous for his short, direct sentences. His writing style — characterized by simple words, active voice, and minimal adverbs — consistently scores high on readability tests. The Hemingway Editor app popularized checking writing for readability, highlighting complex sentences and suggesting simplifications. Our sentence counter provides similar insights by flagging sentences over 25 words.

Sentence Length and SEO

While Google doesn't directly measure sentence length, readability affects user experience metrics that influence rankings. Content with shorter, clearer sentences tends to have lower bounce rates, longer time on page, and higher engagement — all positive ranking signals. Yoast SEO recommends keeping at least 75% of your sentences under 20 words for optimal web readability.