Sentence Counter

How to Use the Sentence Counter

1. Paste your text. A paragraph, a section or a whole essay all work, and the results update as you edit.
2. Read the four headline figures. Sentence count, average words per sentence, and the lengths of your longest and shortest sentences.
3. Check the length breakdown. Sentences under 10 words are short, 10 to 25 are medium and over 25 are long. A page made of only one band reads as monotonous or heavy.
4. Open the notable sentences. The longest and shortest are quoted in full (cut to 200 characters), so you can find and rework them.

How This Counter Finds a Sentence

A sentence is counted when a full stop, exclamation mark or question mark, with any closing quotation mark or bracket that follows it, is followed by a space and then a capital letter or an opening quotation mark. A line that ends in one of those marks also ends a sentence. Abbreviations are protected so they do not split a sentence. Titles and references such as Mr., Mrs., Ms., Dr., Prof., Sr., Jr., St., vs., fig., pp., vol., dept., govt. and approx. never end one. Words that can end a real sentence, such as no., etc., max., min. and est., split only when a capital letter follows, so "No. 5" is safe and "I said no. Then I left." counts as two. A dotted abbreviation such as U.S. or e.g. splits only before a word that usually opens a sentence (The, He, It, They), and a single capital letter, as in J. K. Rowling, is read as an initial.

Decimals such as 3.5 and web addresses such as example.com have no space after the point, so they do not split either. Those rules make the count reliable for ordinary prose, and they also set its limits.

If a text is full of unusual abbreviations or lower-case sentence starts, add or remove a full stop to correct a count, or compare with a word processor. For a quick check of whether your sentences are the right size, the tool is accurate enough.

A Worked Example

Paste this: Sleep matters. Students who sleep fewer than seven hours a night tend to score lower on memory tests. Although the effect is modest in any single study, the pattern appears across so many samples, age groups, and testing conditions that researchers now treat chronic sleep loss as a genuine risk to learning. The counter reports 3 sentences of 2, 16 and 34 words, so the average is 17.3 words, the shortest is 2 and the longest is 34. The breakdown shows 1 short, 1 medium and 1 long sentence.

That is a healthy spread: a short sentence for emphasis, a medium one that carries the claim, and one long sentence to read again. The long one is the candidate for splitting if your reader is skimming.

How Long Should Sentences Be?

There is no single right length, and academic writing runs longer than a news story. Plain-language guides, including ones adapted from the US federal plain-language guidelines, commonly suggest an average of about 20 words or fewer. What matters more than the average is the mix. A paragraph of ten 18-word sentences reads flat; a few short sentences among longer ones give the reader somewhere to rest.

Sentence length also drives readability scores. The Flesch and Gunning formulas both include words per sentence, so shortening your longest sentences is the quickest way to lower a grade level. Run the result through the Readability Score Checker after you edit.

Which Tool Do You Need?

Frequently Asked Questions

How does the sentence counter decide where a sentence ends?

It looks for a full stop, exclamation mark or question mark, plus any closing quotation mark or bracket, followed by a space and a capital letter or opening quote, or for one of those marks at the end of a line. Common abbreviations such as Dr. and U.S. are skipped so they do not cut a sentence short, but "no." and "etc." count as a sentence end when a capital letter follows.

Why does my sentence count differ from Microsoft Word?

Each program has its own rules for abbreviations, quotation marks and lower-case starts, and no rule set is perfect. A difference of a few sentences usually comes from those rules, not from an error in your text.

What is a good average sentence length?

For general readers, about 15 to 20 words is a common target, and academic prose often runs a little higher. Look at the spread as well as the average: a mix of short, medium and long sentences usually reads better than a uniform length.

What counts as a long sentence here?

Any sentence with more than 25 words. Medium sentences have 10 to 25 words and short ones fewer than 10. These bands are rules of thumb for editing, not grammar rules, and a long sentence can be perfectly clear if it is well built.

Does it count questions and exclamations?

Yes. A question mark or exclamation mark ends a sentence in the same way as a full stop, provided a space and a capital letter follow.

Why did it not split after U.S. or Dr.?

Abbreviations are skipped so they do not cut a sentence short. After a dotted abbreviation such as U.S. the counter breaks only if the next word is one that normally opens a sentence, such as The or He, so a sentence that ends in U.S. and goes straight on with a name is counted as one. Add or remove a full stop if you need to correct a count.

Is my text stored or sent anywhere?

No. The counting runs in your browser and the text is not uploaded or saved.