Sentence Counter guide
Paste any text to count sentences and see average sentence length, the number of long sentences, questions, and your single longest sentence. It handles abbreviations like Dr. and U.S. and decimals like 3.50 so the count stays accurate.
Why counting sentences is harder than it looks
The naive method counts every period, question mark, and exclamation point. It breaks on real writing. "Dr. Rivera paid $3.50 for coffee at 8 a.m. on Monday." has five periods and one sentence. Run the sample text on this page through a simple punctuation count and you get 9 sentences. The correct answer is 5.
This counter only splits when ending punctuation is followed by a space and then a capital letter, a digit, or an opening quote or bracket. That alone rules out decimals like 3.50 and lowercase continuations like "a.m. on". It then re-joins any split that happened right after a known abbreviation: titles (Mr., Mrs., Dr., Prof.), months (Jan., Sept.), business suffixes (Inc., Ltd., Corp.), Latin shorthand (e.g., i.e., etc.), U.S., and single-letter initials like J. K. Rowling. A blank line always ends a sentence, so headings and list items separated by blank lines are counted on their own.
What the numbers mean
Average words per sentence is total words ÷ sentences. It is the single strongest predictor in most readability formulas. Over 25 words counts sentences an editor would likely flag. Questions and exclamations count sentences ending in ? or !, useful for spotting an overexcited draft or a page with no direct questions to the reader. Shortest and longest show your range; good writing varies it.
The longest sentence is printed in full so you can fix it immediately. Nine times out of ten, it splits cleanly at an "and", "but", or "which".
Worked example: the sample paragraph
The sample on this page has 5 sentences and 62 words, so the average is 12.4 words. That looks healthy, but the breakdown tells a different story: sentence lengths are 13, 5, 6, 35, and 3 words. One 35-word sentence carries more than half the paragraph. It trips the over-25 flag and shows up as the longest sentence.
Split it into two: "Long sentences that keep adding clauses, examples, and asides make readers work harder than they should. Most of them will skim or give up before the end." Now the longest sentence is 16 words and the paragraph reads faster, with nothing lost. (The word counter treats $3.50 as two tokens, 3 and 50, which is why the first sentence counts as 13 words.)
Sentence length and readability scores
The Flesch-Kincaid Grade Level, developed for the US Navy in 1975 and built into Microsoft Word, is 0.39 × (words ÷ sentences) + 11.8 × (syllables ÷ words) − 15.59. Sentence length is the first term, so cutting average length from 25 to 15 words lowers the grade level by 3.9 grades on its own, before you touch a single long word.
For general US audiences, aim for grade 8 or lower. The federal Plain Writing Act of 2010 requires agencies to write clearly, and plainlanguage.gov guidance recommends an average of 20 words or fewer per sentence. Health and consumer materials often target grade 6.
Common mistakes
Chasing a short average by chopping everything into fragments. Five-word sentences in a row read like a telegram. Mix short, medium, and the occasional long sentence.
Pasting text with hard line breaks, such as from a PDF, and expecting line ends to count as sentence ends. They do not, unless there is a blank line. That is deliberate: PDFs break lines mid-sentence.
Relying on the count for bullet lists without punctuation. Each bullet is one "sentence" only if bullets are separated by blank lines or end with a period.
Unusual abbreviations. "approx." and "Gov." are handled, but niche ones like "Ave." or "Blvd." followed by a capitalized word can add a phantom sentence. If the count looks one or two high, check addresses and technical shorthand.
Frequently asked questions
How does the sentence counter work?
It splits text after a period, question mark, or exclamation point that is followed by a space and a capital letter, number, or quote. It then re-joins splits after common abbreviations such as Dr., Mr., e.g., and U.S., and treats a blank line as the end of a sentence.
What is a good average sentence length?
15 to 20 words is a common target for readable writing. A widely cited American Press Institute study found readers understood more than 90% of sentences of 14 words or fewer, but under 10% at 43 words.
How many words is too long for a sentence?
Over 25 words is a common editing flag, and this tool counts those for you. Long sentences are fine occasionally, but a run of them tires readers.
Does it count decimals and abbreviations as sentence breaks?
No. $3.50 or 2.5 never ends a sentence because there is no space after the period, and a list of common abbreviations like Dr., St., a.m., and Inc. is skipped. Unusual abbreviations can still cause an extra split.
How many sentences are in a paragraph?
Typically 3 to 5 in essays and 1 to 3 in web and news writing. Use the paragraph counter to check paragraph length alongside sentence length.
Does a sentence need punctuation to be counted?
Text without ending punctuation still counts as one sentence per block. Separate blocks with a blank line to count headings or bullet points as their own sentences.
Is text uploaded?
Everything runs in your browser. Nothing you enter is uploaded to a server or stored by us.
How many words should a sentence be for SEO?
Google does not count sentence length, but readability tools such as Yoast flag content when more than 25% of sentences exceed 20 words. Shorter sentences also help your text get quoted in featured snippets.
Can I count sentences in Google Docs or Word?
Word shows sentence-based readability statistics after a spelling and grammar check if you turn on readability stats. Google Docs shows words and characters but not sentences, so paste the text here.